{"id":16773,"date":"2021-08-19T20:08:53","date_gmt":"2021-08-19T14:38:53","guid":{"rendered":"https:\/\/apboardsolutions.guru\/?p=16773"},"modified":"2021-09-15T21:16:11","modified_gmt":"2021-09-15T15:46:11","slug":"ap-9th-class-physical-science-bits-chapter-4","status":"publish","type":"post","link":"https:\/\/apboardsolutions.guru\/ap-9th-class-physical-science-bits-chapter-4\/","title":{"rendered":"AP 9th Class Physical Science Bits Chapter 4 Atoms and Molecules with Answers"},"content":{"rendered":"

Practice the AP 9th Class Physical Science Bits with Answers<\/a> Chapter 4 Atoms and Molecules on a regular basis so that you can attempt exams with utmost confidence.<\/p>\n

AP State Syllabus 9th Class Physical Science Bits 4th Lesson Atoms and Molecules with Answers<\/h2>\n

Question 1.
\nWhen the particles of a substance contain only one type of atoms, that substance is called a \/ an
\nA) molecule
\nB) element
\nC) compound
\nD) atom
\nAnswer:
\nB) element<\/p>\n

Question 2.
\nCombination of atoms of same elements is known as
\nA) molecule
\nB) element
\nC) compound
\nD) atom
\nAnswer:
\nA) molecule<\/p>\n

\"AP<\/p>\n

Question 3.
\nIf atoms of different elements combine then ………………. is formed.
\nA) molecule
\nB) element
\nC) compound
\nD) atom
\nAnswer:
\nC) compound<\/p>\n

Question 4.
\nSymbol of potassium
\nA) Pb
\nB) Na
\nC) Fe
\nD) K
\nAnswer:
\nD) K<\/p>\n

Question 5.
\nThe other name of tungsten
\nA) Natrium
\nB) Kalium
\nC) Wolfram
\nD) Cuprum
\nAnswer:
\nC) Wolfram<\/p>\n

Question 6.
\nCorrect method of representing a symbol
\nA) BE
\nB) he
\nC) al
\nD) Cr
\nAnswer:
\nD) Cr<\/p>\n

Question 7.
\nWhich of the following is octatomic ?
\nA) nitrogen
\nB) oxygen
\nC) carbon
\nD) sulphur
\nAnswer:
\nD) sulphur<\/p>\n

Question 8.
\nThe valency of sulphate is
\nA) 2 –
\nB) 2 +
\nC) 3 –
\nD) 3 +
\nAnswer:
\nA) 2 –<\/p>\n

Question 9.
\nIn NH4<\/sub>Cl, the cation is
\nA) Cl
\nB) NH4<\/sub>
\nC) NH4<\/sub>Cl
\nD) None
\nAnswer:
\nB) NH4<\/sub><\/p>\n

\"AP<\/p>\n

Question 10.
\nChemical formula of aluminium sulphate is
\nA) Al2<\/sub>SO4<\/sub>
\nB) (Al2<\/sub>)2<\/sub>(SO4<\/sub>)3<\/sub>
\nC) Al2<\/sub>(SO4<\/sub>)3<\/sub>
\nD) AlSO4<\/sub>
\nAnswer:
\nC) Al2<\/sub>(SO4<\/sub>)3<\/sub><\/p>\n

Question 11.
\nMolecular mass of H2<\/sub>SO4<\/sub> is
\nA) 98 u
\nB) 89 u
\nC) 49 u
\nD) 106 u
\nAnswer:
\nA) 98 u<\/p>\n

Question 12.
\nMolar mass of 1.5055 \u00d7 1023<\/sup> number of calcium atoms
\nA) 20 gm
\nB) 40 gm
\nC) 10 gm
\nD) 30 gm
\nAnswer:
\nC) 10 gm<\/p>\n

Question 13.
\nConvert into moles : 8 gm of Mg.
\nA) 0.3
\nB) 3
\nC) 2
\nD) 0.2
\nAnswer:
\nA) 0.3<\/p>\n

Question 14.
\nAmong the following which element has more number of atoms ?
\nA) Sulphur
\nB) Calcium
\nC) Nitrogen
\nD) Carbon
\nAnswer:
\nD) Carbon<\/p>\n

Question 15.
\n“Mass is neither created nor destroyed during a chemical reaction”. This is
\nknown as ………………..
\nA) Law of constant proportions
\nB) Law of multiple proportions
\nC) Law of conservation of mass
\nD) Law of conservation of energy
\nAnswer:
\nC) Law of conservation of mass<\/p>\n

Question 16.
\nDalton proposed atomic theory based on ………………………
\nA) Law of conservation of mass
\nB) Law of constant proportions
\nC) Both A & B
\nD) Neither A nor B
\nAnswer:
\nC) Both A & B<\/p>\n

\"AP<\/p>\n

Question 17.
\nAccording to Dalton atom is ………………….. particle.
\nA) indivisible
\nB) tiny
\nC) both A & B
\nD) none of these
\nAnswer:
\nC) both A & B<\/p>\n

Question 18.
\nThe word (atom) is derived from a Greek word “atomio” means ………………….
\nA) indivisible
\nB) divisible
\nC) both A & B
\nD) none of these
\nAnswer:
\nA) indivisible<\/p>\n

Question 19.
\n……………….. are the building blocks of all matter.
\nA) Atoms
\nB) Molecules
\nC) Elements
\nD) Compounds
\nAnswer:
\nA) Atoms<\/p>\n

Question 20.
\nLatin word for water is………………..
\nA) hydro
\nB) oxy
\nC) helios
\nD) none of these
\nAnswer:
\nA) hydro<\/p>\n

Question 21.
\nLatin word for acid is ………………….
\nA) hydro
\nB) oxy
\nC) helios
\nD) atomio
\nAnswer:
\nB) oxy<\/p>\n

Question 22.
\nSymbol of Beryllium is …………………
\nA) Ba
\nB) Be
\nC) Br
\nD) B
\nAnswer:
\nB) Be<\/p>\n

Question 23.
\nSymbol for nitrogen is ………………….
\nA) Ni
\nB) Na
\nC) N
\nD) No
\nAnswer:
\nC) N<\/p>\n

\"AP<\/p>\n

Question 24.
\nSymbol for gold …………………
\nA) G
\nB) Ga
\nC) Ge
\nD) Au
\nAnswer:
\nD) Au<\/p>\n

Question 25.
\nCl2<\/sub> is the formula for ………………………..
\nA) Chlorine
\nB) Cadmium
\nC) Chromium
\nD) Calcium
\nAnswer:
\nA) Chlorine<\/p>\n

Question 26.
\nWe are protected by shielding the earth from some harmful rays of the sun by ……………….
\nA) atmosphere
\nB) ozone layer
\nC) clouds
\nD) sky
\nAnswer:
\nB) ozone layer<\/p>\n

Question 27.
\nThe number of atoms constituting a molecule is known as its …………………….
\nA) valency
\nB) atomicity
\nC) atomic number
\nD) mass number
\nAnswer:
\nB) atomicity<\/p>\n

Question 28.
\nThe atomicity of sodium is ……………….
\nA) 1
\nB) 2
\nC) 3
\nD) 4
\nAnswer:
\nA) 1<\/p>\n

Question 29.
\nThe combining capacity of one atom with another atom is its ……………………
\nA) valency
\nB) atomicity
\nC) atomic number
\nD) mass number
\nAnswer:
\nA) valency<\/p>\n

Question 30.
\nValency of Argon is ……………………
\nA) 0
\nB) 1
\nC) 2
\nD) 3
\nAnswer:
\nA) 0<\/p>\n

\"AP<\/p>\n

Question 31.
\nValency of Carbon is ……………………
\nA) 1
\nB) 2
\nC) 3
\nD) 4
\nAnswer:
\nD) 4<\/p>\n

Question 32.
\nA positively charged ion is called …………………
\nA) radical
\nB) anion
\nC) cation
\nD) complex ion
\nAnswer:
\nC) cation<\/p>\n

Question 33.
\nA negatively charged ion is called …………………
\nA) radical
\nB) anion
\nC) cation
\nD) multiple ion
\nAnswer:
\nB) anion<\/p>\n

Question 34.
\nIn NH4<\/sub>OH the anion is ………………..
\nA) OH–<\/sup>
\nB) NH4<\/sub>+<\/sup>
\nC) NH3<\/sub>+<\/sup>
\nD) NH+<\/sup>
\nAnswer:
\nA) OH–<\/sup><\/p>\n

Question 35.
\nStandard reference for measuring atomic masses of other elements is
\nA) atomic mass of carbon – 12
\nB) atomic mass of carbon – 14
\nC) atomic mass of oxygen – 16
\nD) atomic mass of oxygen – 18
\nAnswer:
\nA) atomic mass of carbon – 12<\/p>\n

Question 36.
\nThe number of times one atom of given element is heavier than 1\/12th part of atomic mass of carbon – 12 is called as ……………..
\nA) valency
\nB) atomicity
\nC) atomic mass
\nD) atomic number
\nAnswer:
\nC) atomic mass<\/p>\n

Question 37.
\nAtomic mass of Magnesium is …………………..
\nA) 8
\nB) 10
\nC) 12
\nD) 24
\nAnswer:
\nD) 24<\/p>\n

\"AP<\/p>\n

Question 38.
\nFormula of silver nitrate …………………
\nA) AgNO2<\/sub>
\nB) AgSO4<\/sub>
\nC) AgNO3<\/sub>
\nD) Ag(NO3<\/sub>)2<\/sub>
\nAnswer:
\nC) AgNO3<\/sub><\/p>\n

Question 39.
\nMolecular mass of sodium carbonate is ………………… U.
\nA) 108
\nB) 104
\nC) 110
\nD) 106
\nAnswer:
\nD) 106<\/p>\n

Question 40.
\nAvogadro constant NA = ……………….
\nA) 6.022 \u00d7 1020<\/sup>
\nB) 6.022 \u00d7 1021<\/sup>
\nC) 6.022 \u00d7 1022<\/sup>
\nD) 6.022 \u00d7 1023<\/sup>
\nAnswer:
\nD) 6.022 \u00d7 1023<\/sup><\/p>\n

Question 41.
\nMolar mass of water = ………………….. U.
\nA) 16
\nB) 18
\nC) 20
\nD) 22
\nAnswer:
\nB) 18<\/p>\n

Question 42.
\nNumber of particles present in 32 g of oxygen molecule are ……………………
\nA) 6.022 \u00d7 1020<\/sup>
\nB) 3.011 \u00d7 1023<\/sup>
\nC) 6.022 \u00d7 1022<\/sup>
\nD) 6.022 \u00d7 1023<\/sup>
\nAnswer:
\nD) 6.022 \u00d7 1023<\/sup><\/p>\n

Question 43.
\nNumber of moles of 22g of carbon dioxide is ………………….
\nA) 1
\nB) 0.25
\nC) 0.75
\nD) 0.5
\nAnswer:
\nD) 0.5<\/p>\n

Question 44.
\nThe valency of Copper in Cu2<\/sub>O is …………………
\nA) + 1
\nB) + 2
\nC) + 3
\nD) – 1
\nAnswer:
\nA) + 1<\/p>\n

Question 45.
\nNumber of particles in 7.75 g of phosphorous is …………………
\nA) 6.022 \u00d7 1023<\/sup>
\nB) 3.011 \u00d7 1023<\/sup>
\nC) 1.5055 \u00d7 1023<\/sup>
\nD) 6.022 \u00d7 1022<\/sup>
\nAnswer:
\nC) 1.5055 \u00d7 1023<\/sup><\/p>\n

\"AP<\/p>\n

Question 46.
\nSymbol of nitrate is ………………
\nA) NO3<\/sub>–<\/sup>
\nB) NO2<\/sub>–<\/sup>
\nC) N3-<\/sup>
\nD) N–<\/sup>
\nAnswer:
\nA) NO3<\/sub>–<\/sup><\/p>\n

Question 47.
\nStatement – I : The symbol of chloride Ion is Cl–<\/sup>.
\nStatement – II : The symbol of ammonium ion is 4<\/sub>+<\/sup>.
\nA) Both the statements are true.
\nB) Statement – I is true and statement – II is false.
\nC) Statement -I is false and statement – II is true.
\nD) Both the statements are false.
\nAnswer:
\nA) Both the statements are true.<\/p>\n

Question 48.
\nSymbol of sodium ion is ………………..
\nA) Na
\nB) Na2+<\/sup>
\nC) Na3+<\/sup>
\nD) Na+<\/sup>
\nAnswer:
\nD) Na+<\/sup><\/p>\n

Question 49.
\nMatch the following.<\/p>\n\n\n\n\n\n\n
a) Calcium nitrate<\/td>\ni) HNO3<\/sub><\/td>\n<\/tr>\n
b) Nitric acid<\/td>\nii) (NH4<\/sub>)3<\/sub>PO4<\/sub><\/td>\n<\/tr>\n
c) Ammonium chloride<\/td>\niii) Ca(NO3<\/sub>)2<\/sub><\/td>\n<\/tr>\n
d) Ammonium phosphate<\/td>\niv) NH4<\/sub>Cl<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

A) a \u2192 iii, b\u2192 i, c \u2192 iv, d \u2192 ii
\nB) a \u2192 i, b \u2192 ii, c \u2192 iii, d \u2192 iv
\nC) a \u2192 ii, b \u2192 iii, c \u2192 iv, d \u2192 i
\nD) a \u2192 iv, b \u2192 i, c \u2192 ii, d \u2192 iii
\nAnswer:
\nA) a \u2192 iii, b\u2192 i, c \u2192 iv, d \u2192 ii<\/p>\n

Question 50.
\nThe formula of Aluminium Carbonate is ……………………
\nA) AlCO3<\/sub>
\nB) Al2<\/sub>CO3<\/sub>
\nC) Al2<\/sub>(CO3<\/sub> )3<\/sub>
\nD) Al(CO3<\/sub>)2<\/sub>
\nAnswer:
\nC) Al2<\/sub>(CO3<\/sub> )3<\/sub><\/p>\n

Question 51.
\nThe symbol of Zinc ion is ……………….
\nA) Zn
\nB) Zn+<\/sup>
\nC) Zn2+<\/sup>
\nD) Zn3+<\/sup>
\nAnswer:
\nC) Zn2+<\/sup><\/p>\n

Question 52.
\nWhich of the following statement is not given by Dalton ?
\nStatement (A) : If mass was to be conserved, then all elements must be made up of extremely small particles.
\nStatement (B) : If law of constant proportion is to be followed, the particles of same substance be either same or different.
\nA) A only
\nB) B only
\nC) both A & B
\nD) none
\nAnswer:
\nB) B only<\/p>\n

\"AP<\/p>\n

Question 53.
\nWho is correct ?
\nSrinu : Elements are made up of atoms.
\nMohan : Atoms are made up of elements.
\nA) Srinu
\nB) Mohan
\nC) Both
\nD) Neither Srinu nor Mohan
\nAnswer:
\nA) Srinu<\/p>\n

Question 54.
\nAssertion (A) : The atomic mass of magnesium is 24.
\nReason (R) : Magnesium atom is 24 times heavier than that of 1 \/12 of mass of carbon.
\nA) A and R are true, A is supported by R
\nB) A and R are true, A is not supported by R
\nC) A and R are false
\nD) A is true but R is false
\nAnswer:
\nA) A and R are true, A is supported by R<\/p>\n

Question 55.
\nAssertion (A) : Atomic mass has no units.
\nReason (R) : Atomic mass is an expression of ratio.
\nA) A and R are true, A is supported by R
\nB) A and R are true, A is not supported by R
\nC) A and R are false
\nD) A is true but R is false
\nAnswer:
\nA) A and R are true, A is supported by R<\/p>\n

Question 56.
\nAn iron rod changed into iron oxide by rusting. Guess how the weights before and after rusting of the iron rod are changed,
\nif a = weight of the iron rod
\nb = weight of the iron oxide
\nA) a > b
\nB) b > a
\nC) a = b
\nD) we cannot say
\nAnswer:
\nC) a = b<\/p>\n

Question 57.
\nIn the experiment of “To prove law of conservation of mass”, Manoj found that weight of ‘Mg’ in a closed test tube is not equal to the weight of ‘MgO’ after burning.
\nThe reason may be
\nA) ‘Law of conservation of mass\u2019 is not applicable to some chemical changes.
\nB) Some gas was escaped in this experiment.
\nC) He was used simple balance to weight.
\nD) Above all
\nAnswer:
\nB) Some gas was escaped in this experiment.<\/p>\n

Question 58.
\nCO : 1 : 1 :: CO2<\/sub> : ………………… ?
\nA) 1 : 1
\nB) 2 : 1
\nC) 1 : 2
\nD) 2 : 3
\nAnswer:
\nC) 1 : 2<\/p>\n

Question 59.
\nMolecules in water is H2<\/sub>O, then molecules in the Hydrogen is
\nA) H
\nB) H2<\/sub>
\nC) A or B
\nD) No molecules
\nAnswer:
\nB) H2<\/sub><\/p>\n

\"AP<\/p>\n

Question 60.
\nWhy did symbol of copper taken as ‘Cu’ ?
\nA) Latin name of copper is cuprum.
\nB) Original spelling of copper is cupper.
\nC) Symbols of all metals should be taken in two letters.
\nD) Above all
\nAnswer:
\nA) Latin name of copper is cuprum.<\/p>\n

Question 61.
\nStatement (A) : Symbol of carbon is ‘C’ whereas symbol of calcium is ‘Ca’.
\nReason (R) : Eventhough carbon and calcium have ‘C’ as its initial, carbon occurs first in periodic table. So, its symbol was taken as ‘C’ and calcium symbol was taken as ‘Ca’.
\nA) Both A and R are true
\nB) Both A and R are false
\nC) A is true but R is false
\nD) A is false but R is true
\nAnswer:
\nA) Both A and R are true<\/p>\n

Question 62.
\nGenerally all inert gases like He, Ne, Ar, Kr, Xe are available as monoatomic elements.
\nGuess the reason.
\nA) They are more reactive
\nB) Their valency is zero
\nC) Their valency is less than 8
\nD) They are unstable
\nAnswer:
\nB) Their valency is zero<\/p>\n

Question 63.
\nIf ‘x-1<\/sup>‘ and Na’x’, then ‘x’ may be
\nA) carbon
\nB) cromium
\nC) chlorine
\nD) copper
\nAnswer:
\nC) chlorine<\/p>\n

Question 64.
\nThe valencies of ‘Mg’ and ‘O’ are ………………… respectively in MgO.
\nA) 1, 1
\nB) 2, 2
\nC) 1, 2
\nD) 2, 1
\nAnswer:
\nB) 2, 2<\/p>\n

Question 65.
\n‘X2<\/sub> Y’, ‘X’ H ‘Y’, ‘X’ OH
\nGuess X and Y.
\nA) X = Na ; Y = OH
\nB) X = Na ; Y = CO3<\/sub>
\nC) X = CO3<\/sub> ; Y = Zn
\nD) X = Zn ; Y = CO3<\/sub>
\nAnswer:
\nB) X = Na ; Y = CO3<\/sub><\/p>\n

Question 66.
\nBy using Ag+<\/sup> Cl–<\/sup>, Na+<\/sup>, OH–<\/sup>
\nHow many substances can be formed?
\nA) 2
\nB) 3
\nC) 4
\nD) 6
\nAnswer:
\nC) 4<\/p>\n

Question 67.
\nMolar mass of molecule x = 2 gr
\nMolar mass of molecule y = 32 gr
\nMolar mass of molecule x2<\/sub> y = 18 gr Predict x and y.
\nA) x = H2<\/sub> ; y = O2<\/sub>
\nB) x = O2<\/sub> ; y = H2<\/sub>
\nC) x = H2<\/sub>; y = Cl2<\/sub>
\nD) x = Cl2<\/sub> ; y = H2<\/sub>
\nAnswer:
\nA) x = H2<\/sub> ; y = O2<\/sub><\/p>\n

\"AP<\/p>\n

Question 68.
\nNo. of molecules in 44 grams of CO2<\/sub> is equal to
\nA) no. of molecules in 18 gr of H2<\/sub>O
\nB) no. of molecules in 2 grams of H2<\/sub>
\nC) no. of molecules in 32 grams of O2<\/sub>
\nD) any one of the above
\nAnswer:
\nD) any one of the above<\/p>\n

Question 69.
\n\"AP
\nTo prove ‘conservation of the mass’, what should be weight ?
\nA) weight of lead nitrate
\nB) weight of potassium iodide
\nC) weight of lead iodide and potassium nitrate
\nD) above all
\nAnswer:
\nD) above all<\/p>\n

Question 70.
\nIn the above given experiment, this precaution must be taken
\nA) put the cork tightly
\nB) measure components accurately
\nC) while measuring leave the apparatus freely
\nD) above all
\nAnswer:
\nD) above all<\/p>\n

Question 71.
\nLaw of conservation of mass was proposed by
\nA) Antoine Lavoisier
\nB) Joseph L. Proust
\nC) John Dalton
\nD) Landolt
\nAnswer:
\nA) Antoine Lavoisier<\/p>\n

Question 72.
\nLaw of conservation of mass was experimentally verified by
\nA) Antoine Lavoisier
\nB) Joseph L. Proust
\nC) John Dalton
\nD) Landolt
\nAnswer:
\nD) Landolt<\/p>\n

Question 73.
\nLaw of constant proportions was proposed by
\nA) Antoine Lavoisier
\nB) Joseph L. Proust
\nC) John Dalton
\nD) Landolt
\nAnswer:
\nB) Joseph L. Proust<\/p>\n

Question 74.
\nWhat is the original name of Kanada, an Indian sage, who proposed anu and paraman I ?
\nA) Vaishesika Sutra
\nB) Rishi
\nC) Kasyapa
\nD) Bhaskara
\nAnswer:
\nC) Kasyapa<\/p>\n

\"AP<\/p>\n

Question 75.
\nInitial letter of an element written in capitals should represent that a particular element. This was proposed by
\nA) John Dalton
\nB) Landolt
\nC) John Berzelius
\nD) Wilhelm Ostwald
\nAnswer:
\nC) John Berzelius<\/p>\n

Question 76.
\nThe word ‘mole’ was first introduced by
\nA) John Berzelius
\nB) Wilhelm Ostwald
\nC) John Dalton
\nD) Avogadro
\nAnswer:
\nB) Wilhelm Ostwald<\/p>\n

Question 77.
\nNumber of particles present in 9 grams of aluminium
\nA) 2.007 \u00d7 1023<\/sup>
\nB) 3.011 \u00d7 1023<\/sup>
\nC) 18.066 \u00d7 1023<\/sup>
\nD) 6.022 \u00d7 1023<\/sup>
\nAnswer:
\nA) 2.007 \u00d7 1023<\/sup><\/p>\n

Question 78.
\nFather of modern chemistry is ………………….
\nA) Levoisier
\nB) Proust
\nC) Dalton
\nD) Landolt
\nAnswer:
\nA) Levoisier<\/p>\n

Question 79.
\nGreek name of sun is ………………
\nA) hydro
\nB) oxy
\nC) helios
\nD) atomio
\nAnswer:
\nC) helios<\/p>\n

Question 80.
\nThe latin name of Mercury is
\nA) Aurum
\nB) Cupsum
\nC) Kalium
\nD) Hydragyrum
\nAnswer:
\nD) Hydragyrum<\/p>\n

Question 81.
\n\"AP
\nFrom the table particularly we can prove that
\nA) Law of conservation of mass
\nB) Law of constant proportions
\nC) Law of conservation of energy
\nD) Above all
\nAnswer:
\nB) Law of constant proportions<\/p>\n

\"AP<\/p>\n

Question 82.
\n\"AP
\nThe missing symbol is
\nA) Ch
\nB) Ce
\nC) Cl
\nD) Chl
\nAnswer:
\nC) Cl<\/p>\n

Question 83.
\n\"AP
\nx, y, z are ………………, ………………., …………….. respectively.
\nA) Sodium, Ag, Kalium
\nB) Kalium, Sodium, Ag
\nC) Ag, Sodium, Kalium
\nD) Ag, Kalium, Sodium
\nAnswer:
\nA) Sodium, Ag, Kalium<\/p>\n

Question 84.
\n\"AP From the given substance, select the wrong statement.
\nA) It is a molecule of oxygen
\nB) It has two elements
\nC) It contains two oxygen atoms
\nD) It is not a compound
\nAnswer:
\nB) It has two elements<\/p>\n

Question 85.
\n\"AP
\nThe formula of magnesium chloride is
\nA) MgCl2<\/sub>
\nB) Mg2<\/sub>Cl
\nC) MgCl
\nD) Mg2<\/sub>Cl2<\/sub>
\nAnswer:
\nA) MgCl2<\/sub><\/p>\n

Question 86.
\n\"AP
\nFrom the given data single molecule of water is
\nA) ‘a’
\nB) ‘b’
\nC) ‘a’ and ‘b’
\nD) neither ‘a’ nor ‘b’
\nAnswer:
\nD) neither ‘a’ nor ‘b’<\/p>\n

Question 87.
\n\"AP By using this, select the wrong statement.
\nA) The atomicity of water molecule is 6.
\nB) Water molecule contains 3 atoms.
\nC) The above indicates 2 molecules of water.
\nD) It is not exists because of unstable.
\nAnswer:
\nA) The atomicity of water molecule is 6.<\/p>\n

\"AP<\/p>\n

Question 88.
\n\"AP
\nx, y, z are ………………., ………………, ……………….. respectively.
\nA) O8<\/sub>, S3<\/sub>, diatomic
\nB) S8<\/sub>, C3<\/sub>, monoatomic
\nC) S8<\/sub>, O3<\/sub>, diatomic
\nD) S8<\/sub>, O3<\/sub>, diatomic
\nAnswer:
\nC) S8<\/sub>, O3<\/sub>, diatomic<\/p>\n

Question 89.
\n\"AP
\na, b, c are ……………., ………………., ……………… (respectively)
\nA) NaCl, Na2<\/sub>NO3<\/sub>, MgOH
\nB) NaCl2<\/sub>, NaNO3<\/sub>, Mg(OH)2<\/sub>
\nC) NaCl, NaNO3<\/sub>, MgOH
\nD) NaCl, NaNO3<\/sub>, Mg(OH)2<\/sub>
\nAnswer:
\nD) NaCl, NaNO3<\/sub>, Mg(OH)2<\/sub><\/p>\n

Question 90.
\nFind the odd one according to their net charge of ion.
\nA) Hydrogen, sodium, potassium
\nB) Magnesium, calcium, zinc
\nC) Aluminium, iron, silver
\nD) Ammonium, copper, silver
\nAnswer:
\nC) Aluminium, iron, silver<\/p>\n

Question 91.
\nAntoine Lavoisier is appreciable because,
\nA) He proposed the law of conservation of mass.
\nB) He is the father of modern chemistry.
\nC) He proposed the law of constant proportions.
\nD) A and B
\nAnswer:
\nD) A and B<\/p>\n

Question 92.
\nAtomic mass can be measured accurately by using this device.
\nA) Mass spectrometer
\nB) Light spectrometer
\nC) Electronic balance
\nD) None
\nAnswer:
\nA) Mass spectrometer<\/p>\n

Question 93.
\nNo. of atoms in 16 g of oxygen.
\nA) 6.022 \u00d7 1023<\/sup>
\nB) 3.011 \u00d7 1023<\/sup>
\nC) 12.044 \u00d7 1023<\/sup>
\nD) None
\nAnswer:
\nA) 6.022 \u00d7 1023<\/sup><\/p>\n

Question 94.
\nIn a soda water there is 44 grams of CO2<\/sub> is mixed with 18 grams of water. The no. of molecules of H2<\/sub>CO3<\/sub> (soda water) is
\nA) 6.022 \u00d7 1023<\/sup>
\nB) 3.011 \u00d7 1023<\/sup>
\nC) 12.044 \u00d7 1023<\/sup>
\nD) None
\nAnswer:
\nA) 6.022 \u00d7 1023<\/sup><\/p>\n

\"AP<\/p>\n

Question 95.
\nAvogadro is appreciable, because he found that one mole of any substance contains …………….. molecules.
\nA) 6.2 \u00d7 1022<\/sup>
\nB) 6.4 \u00d7 1019<\/sup>
\nC) 6.02 \u00d7 1023<\/sup>
\nD) Countless
\nAnswer:
\nC) 6.02 \u00d7 1023<\/sup><\/p>\n

Question 96.
\nThe great mole concept was introduced by ……………….. and he is appreciable.
\nA) Avogadro
\nB) Ostwald
\nC) Dalton
\nD) Lavoisier
\nAnswer:
\nB) Ostwald<\/p>\n

Question 97.
\n‘Washing soda’ is the common name of
\nA) Na2<\/sub>CO3<\/sub>
\nB) NaHCO3<\/sub>
\nC) Na2<\/sub>SO4<\/sub>
\nD) Na3<\/sub>PO4<\/sub>
\nAnswer:
\nA) Na2<\/sub>CO3<\/sub><\/p>\n

Question 98.
\nMatch the following.<\/p>\n\n\n\n\n\n\n
a) Copper<\/td>\ni) Aurum<\/td>\n<\/tr>\n
b) Potassium<\/td>\nii) Cuprum<\/td>\n<\/tr>\n
c) Gold<\/td>\niii) Kalium<\/td>\n<\/tr>\n
d) Silver<\/td>\niv) Argentum<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

A) a \u2192 iii, b \u2192 iv, c \u2192 i, d \u2192 ii
\nB) a \u2192 ii, b \u2192 iii, c \u2192 i, d \u2192 iv
\nC) a \u2192 i, b \u2192 ii, c \u2192 iii, d \u2192 iv
\nD) a \u2192 iv, b \u2192 i, c \u2192 ii, d \u2192 iii
\nAnswer:
\nB) a \u2192 ii, b \u2192 iii, c \u2192 i, d \u2192 iv<\/p>\n

Question 99.
\nBased on atomicity match Set – A with Set – B :<\/p>\n\n\n\n\n\n\n
Set – A<\/td>\nSet – B<\/td>\n<\/tr>\n
P. Monoatomic<\/td>\nx. Fluorine<\/td>\n<\/tr>\n
Q. Diatomic<\/td>\ny. Helium<\/td>\n<\/tr>\n
R. Triatomic<\/td>\nz. Ozone<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

A) P – y, Q – x, R – z
\nB) P – y, Q – z, R – x
\nC) P – z, Q – y, R – x
\nD) P – z, Q – x, R – y
\nAnswer:
\nA) P – y, Q – x, R – z<\/p>\n

Question 100.
\nThe correct order in the activity to observe law of conservation of mass is
\nP. Take 100 ml of silver nitrate solution in a chemical flask and 5 ml of sodium chloride in a test tube.
\nQ. Due to reaction between these two white precipitate will form.
\nR. Add sodium chloride solution to silver nitrate solution.
\nS. Weight the two and record the sum of their weights.
\nT. After reaction weigh it again and it will be equal to the previous reading.
\nA) P, R, S, Q, T
\nB) P, S, R, Q, T
\nC) P, S, Q, R, T
\nD) P, S, R, T, Q
\nAnswer:
\nA) P, R, S, Q, T<\/p>\n

Question 101.
\nUma : Mass is neither created nor destroyed during a chemical reaction. Rama : Matter is conserved in a chemical reaction.
\nA) Uma is correct, Rama is incorrect.
\nB) Bot Uma and Rama are correct.
\nC) Both Uma and Rama are incorrect.
\nD) Uma is incorrect, Rama is correct.
\nAnswer:
\nA) Uma is correct, Rama is incorrect.<\/p>\n

\"AP<\/p>\n

Question 102.
\n\"AP : Sodium carbonate : : Al2<\/sub>(SO4<\/sub>)3<\/sub> : Aluminium sulphate
\nA) NaCO3<\/sub>
\nB) Na2<\/sub>(CO3<\/sub>)2<\/sub>
\nC) Na2<\/sub>(CO3<\/sub>)2<\/sub>
\nD) Na2<\/sub>CO3<\/sub>
\nAnswer:
\nD) Na2<\/sub>CO3<\/sub><\/p>\n

Question 103.
\nDavid : By transfer of electrons atoms – can attain octet
\nDravid : By sharing of electrons atoms – can attain octet
\nA) David incorrect, Dravid correct.
\nB) Both David and Dravid are incorrect.
\nC) Both David and Dravid are correct.
\nD) David correct, Dravid incorrect.
\nAnswer:
\nC) Both David and Dravid are correct.<\/p>\n

Question 104.
\nA given chemical substance always contains the same elements combined in a fixed proportion by mass. Guess the compounds formed in the ratio of 1 : 1 and 1 : 2 by Carbon and Oxygen.
\nA) CO2<\/sub>, CO
\nB) CO, CO3<\/sub>
\nC) CO2<\/sub>, CO3<\/sub>
\nD) CO, CO2<\/sub>
\nAnswer:
\nD) CO, CO2<\/sub><\/p>\n

Question 105.
\nA neutral metal atom becomes dipositive ion by loosing two”electrons. In the same way a neutral non-metal atom becomes uni-negative ion by gaining one electron. The formula of a compound which is formed by these two ions is
\nA) m2<\/sub>
\nB) m2<\/sub>x1<\/sub>
\nC) m2<\/sub>x3<\/sub>
\nD) m2<\/sub>x2<\/sub>
\nAnswer:
\nD) m2<\/sub>x2<\/sub><\/p>\n

Question 106.
\nWe can test the law of conservation of mass by the reaction between barium chloride and sodium sulphate. While doing the experiment, one of the precautions you have taken is
\nA) Reactants should be taken in solid state.
\nB) Cork was not fitted while the reaction is taking place.
\nC) Common balance is used to weigh the substances.
\nD) Flask was tilted and swirled for the mixing of two solutions.
\nAnswer:
\nD) Flask was tilted and swirled for the mixing of two solutions.<\/p>\n

Question 107.
\nThe apparatus which is not required in the experiment mentioned in question number (8) is
\nA) Test tube
\nB) Beaker
\nC) Stand
\nD) Conical flask
\nAnswer:
\nB) Beaker<\/p>\n

\"AP
\nObserve the following flow chart and answer 10 & 11 questions.
\nQuestion 108.
\nBased on the above flow chart, generalised statement is
\nP : In any substance the no. of particles in one mole is constant.
\nQ : Irrespective of quantity of a matter, the no. of atoms or molecules in it is constant.
\nR : There is no relation between the mole and the substance.
\nA) Q only
\nB) P and Q
\nC) R only
\nD) P only
\nAnswer:
\nA) Q only<\/p>\n

\"AP<\/p>\n

Question 109.
\nhi the above flow chart, the number 6.022 \u00d7 1023<\/sup> is
\nA) Avogadro number (N)
\nB) Mass number (A)
\nC) Atomic number (Z)
\nD) Atomic mass unit (amu)
\nAnswer:
\nA) Avogadro number (N)<\/p>\n

Question 110.
\n\"AP
\nWrongly labelled part in the above diagram is
\nA) Test tube
\nB) Measuring jar
\nC) Rubber cork
\nD) Spring balance
\nAnswer:
\nA) Test tube<\/p>\n

Question 111.
\nThe molecular mass of a substance is the sum of the atomic masses of all the atoms in a molecule of the substance. If the atomic masses of hydrogen, sulphur and oxygen are 1, 32, 16 successively then the molecular mass of sulphuric acid is
\nA) 98 U
\nB) 49 U
\nC) 97 U
\nD) 89 U
\nAnswer:
\nA) 98 U<\/p>\n

Question 112.
\nSome symbols of elements are based on their English names. Some other are based on their Latin names. Which of the following elements have symbols based on Latin names ?
\ni) Sodium
\nii) Neon
\niii) Gold
\niv) Argon
\nA) (i) and (iii)
\nB) (i) and (iv)
\nC) (ii) and (iv)
\nD) (i) and (ii)
\nAnswer:
\nA) (i) and (iii)<\/p>\n

Question 113.
\nNo. of molecules present in 18 grams of H2<\/sub>O
\nA) 6.02 \u00d7 1022<\/sup>
\nB) 6.02 \u00d7 1023<\/sup>
\nC) 6.02 \u00d7 1032<\/sup>
\nD) 6.02 \u00d7 1035<\/sup>
\nAnswer:
\nB) 6.02 \u00d7 1023<\/sup><\/p>\n

Question 114.
\nIf valency of Mg is ‘+2’ and valency of Sulphate (SO4<\/sub>) is ‘-2’, then the formula of compound formed by these
\nA) Mg2<\/sub>SO4<\/sub>
\nB) Mg (SO4<\/sub>)2<\/sub>
\nC) MgSO4<\/sub>
\nD) Mg3<\/sub>(SO4<\/sub>)2<\/sub>
\nAnswer:
\nA) Mg2<\/sub>SO4<\/sub><\/p>\n

Question 115.
\nHomogeneous molecule from the following
\nA) H2<\/sub>O
\nB) N2<\/sub>
\nC) N2<\/sub>O3<\/sub>
\nD) FeSO4<\/sub>
\nAnswer:
\nB) N2<\/sub><\/p>\n

\"AP<\/p>\n

Question 116.
\nHow many moles are contained in 180 grams of water ?
\nA) 100
\nB) 10
\nC) 180
\nD) 18
\nAnswer:
\nB) 10<\/p>\n

Question 117.
\nWhat is the valency of silver ?
\nA) 1
\nB) 2
\nC) 3
\nD) 4
\nAnswer:
\nA) 1<\/p>\n

Question 118.
\nThe Common name of Hydrogen Monoxide is
\nA) Water
\nB) Salt
\nC) Washing Soda
\nD) Baking Soda
\nAnswer:
\nA) Water<\/p>\n

Question 119.
\nValencies of nitrogen and hydrogen are 3 and 1 respectively. The formula of ammonia molecule formed by these
\ntwo atoms
\nA) NH3<\/sub>
\nB) NH4<\/sub>
\nC) N3<\/sub>H
\nD) N4<\/sub>H
\nAnswer:
\nA) NH3<\/sub><\/p>\n

Question 120.
\nP : The atmoicity of Oxygen is 3
\nQ : The formula of ozone is O3<\/sub>.
\nA) P – correct, Q – incorrect
\nB) P – incorrect, Q – correct
\nC) Both P & Q incorrect
\nD) Both P & Q correct
\nAnswer:
\nD) Both P & Q correct<\/p>\n

Question 121.
\nOne of the precautions to be taken in the conduction of experiment on law of conservation of mass is
\nA) Test tube should not be tilted
\nB) Test tube should be tilted
\nC) Test tube should be immersed in the conical flask
\nD) Test tube should be kept outside the conical flask
\nAnswer:
\nB) Test tube should be tilted<\/p>\n

Question 122.
\nOrnaments that we wear contains ………………… metal
\nA) Mercury
\nB) Sodium
\nC) Calcium
\nD) Gold
\nAnswer:
\nD) Gold<\/p>\n

\"AP<\/p>\n

Question 123.
\nThe latin name of the element Tungsten is
\nA) Aurum
\nB) Plumbum
\nC) Kalium
\nD) Wolfram
\nAnswer:
\nD) Wolfram<\/p>\n

Question 124.
\nMolecular formula of Ozone is ………………….
\nA) O3<\/sub>
\nB) O2<\/sub>
\nC) O
\nD) O8<\/sub>
\nAnswer:
\nA) O3<\/sub><\/p>\n

Question 125.
\nMatching<\/p>\n\n\n\n\n\n
i) Sodium bi-carbonate<\/td>\nx) Na2<\/sub>CO3<\/sub><\/td>\n<\/tr>\n
ii) Sodium Carbonate<\/td>\ny) NaOH<\/td>\n<\/tr>\n
iii) Sddium Hydroxide<\/td>\nz) NaHCO3<\/sub><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

A) i – y, ii – x, iii – z
\nB) i – z, ii – x, iii – y
\nC) i – y, ii – z, iii – x
\nD) i – z, ii – y, iii – x
\nAnswer:
\nB) i – z, ii – x, iii – y<\/p>\n","protected":false},"excerpt":{"rendered":"

Practice the AP 9th Class Physical Science Bits with Answers Chapter 4 Atoms and Molecules on a regular basis so that you can attempt exams with utmost confidence. AP State Syllabus 9th Class Physical Science Bits 4th Lesson Atoms and Molecules with Answers Question 1. When the particles of a substance contain only one type …<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[12],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts\/16773"}],"collection":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/comments?post=16773"}],"version-history":[{"count":0,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/posts\/16773\/revisions"}],"wp:attachment":[{"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/media?parent=16773"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/categories?post=16773"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/apboardsolutions.guru\/wp-json\/wp\/v2\/tags?post=16773"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}