AP 7th Class Science Bits Chapter 2 Acids and Bases with Answers

Practice the AP 7th Class Science Bits with Answers Chapter 2 Acids and Bases on a regular basis so that you can attempt exams with utmost confidence.

AP State Syllabus 7th Class Science Bits 2nd Lesson Acids and Bases with Answers

Choose the correct answer.

Question 1.
Which of the following is natural acid?
A) Citric acid
B) Hydrochloric acid
C) Oxalic acid
D) Acetic acid
Answer:
B) Hydrochloric acid

Question 2.
A blue litmus turns red when it reacts with
A) Salt
B) Base
C) Acid
D) None of these
Answer:
C) Acid

Question 3.
Name the acid present in lemon juice
A) Acetic acid
B) Citric acid
C) Propanic acid
D) Hydrochloric acid
Answer:
B) Citric acid

Question 4.
Ant releases this acid.
A) Citric acid
B) Formic acid
C) Lactic acid
D) Oxalic acid
Answer:
B) Formic acid

Question 5.
When methyl orange is mixed with citiric acid it turns
A) Red
B) Pink
C) Yellow
D) Colourless
Answer:
A) Red

Question 6.
Phenolphthalein turns ………… in basic solution.
A) Red
B) Yellow
C) Pink
D) Green
Answer:
C) Pink

Question 7.
Lemon Juice + Marble =
A) Hydrogen
B) Carbon dioxide
C) Oxygen
D) Sulphur dioxide
Answer:
B) Carbon dioxide

Question 8.
Neutralization of Hydrochloric acid solution with Caustic soda solution gives
A) Sodium chloride
B) Sodium carbonate
C) Copper sulphate
D) None of the above
Answer:
A) Sodium chloride

Question 9.
The substance that turns blue litmus to red are ……….. in nature.
A) Acidic
B) Basic
C) Neutral
D) All the above
Answer:
A) Acidic

Question 10.
Turmeric paper is a natural
A) Salt
B) Acid
C) Base
D) Indicator
Answer:
C) Base

Question 11.
The substance that turns red litmus to blue are …………. in nature.
A) Acidic
B) Basic
C) Neutral
D) All the above
Answer:
B) Basic

Question 12.
Burning sensation of ant bite is caused by
A) Acetic Acid
B) Formic Acid
C) Uric Acid
D) Toxin
Answer:
B) Formic Acid

Question 13.
Vinegar consist acid
A) Acetic
B) Citric
C) Lactic
D) Oxalic
Answer:
A) Acetic

Question 14.
Malic Acid present in
A) Orange
B) Amla
C) Apples
D) Tea
Answer:
C) Apples

Question 15.
The substances which are soapy to touch are …………. in nature.
A) Acids
B) Bases
C) Salts
D) Minerals
Answer:
B) Bases

Question 16.
Ammonium Hydroxide is used in ………….. cleaning.
A) Glass
B) Tiles
C) Granites
D) All the above
Answer:
A) Glass

Question 17.
Methyl Orange gives red colour with
A) Acids
B) Bases
C) Salts
D) All the above
Answer:
A) Acids

Question 18.
Methyl Orange gives yellow colour with ………
A) Acids
B) Bases
C) Salts
D) All the above
Answer:
B) Bases

Question 19.
Pickles, jams, jellie ‘s are not preser-container.
A) Metallic
B) Glass
C) Porcelain
D) Plastic
Answer:
A) Metallic

Question 20.
Copper reacts with and forms blue-green layer.
A) Acids
B) Bases
C) Salts
D) Neutrals
Answer:
A) Acids

Question 21.
Henry Cavendish, an Italian discovered
A) Oxygen
B) Nitrogen
C) Copper
D) Hydrogen
Answer:
D) Hydrogen

Question 22.
Acid rains are the combination of ……….. acids.
A) Sulphuric
B) Nitric
C) Carbonic
D) All the above
Answer:
D) All the above

Question 23.
Egg shells release …………… gas when it reacts with acids.
A) Oxygen
B) Carbon dioxide
C) Hydrogen
D) Helium
Answer:
B) Carbon dioxide

Question 24.
One of the following manure increase salinity of the soil
A) Organic
B) Chemical
C) Bio
D) All of these
Answer:
B) Chemical

Question 25.
Ammonium Hydroxide is useful to remove stains of
A) Grease
B) Blood
C) Tea
D) Ink
Answer:
A) Grease

Question 26.
Aluminum hydroxide is useful to stop
A) Rains
B) Floods
C) Fire
D) Pollution
Answer:
C) Fire

Question 27.
We lose some salts through
A) Digestion
B) Reproduction
C) Excretion
D) Respiration
Answer:
C) Excretion

Question 28.
Carbonic acids present in ………..
A) Eggs
B) Cool drinks
C) Cakes
D) Meat
Answer:
B) Cool drinks

Question 29.
When lime water is sprayed on turmeric paper, its colour is
A) Yellow
B) Blue
C) green
D) Red
Answer:
D) Red

Question 30.
Following is a natural indicator
A) Turmeric
B) Methyl
C) Phenolphthalein
D) Methyl orange
Answer:
A) Turmeric

Question 31.
The subsances that are soapy to touch
A) Acids
B) Basics
C) Neutrals
D) Minerals
Answer:
B) Basics

Question 32.
Which litmus paper do you use to test acids?
A) Red
B) Blue
C) Orange
D) Green
Answer:
B) Blue

Question 33.
If the substance changed the red litmus in to blue it is an ………..
A) Acid
B) Basic
C) Neutral
D) All
Answer:
B) Basic

Question 34.
Acid present in apple’s
A) Citric acid
B) Lactic acid
C) Malic acid
D) Tannic acid
Answer:
C) Malic acid

Question 35.
Ascorbic acid is present in
A) Palm oil
B) Amla
C) Tea
D) Grapes
Answer:
B) Amla

Question 36.
Match the following.
i) Oxalic acid [ ] a) Tomato
ii) Lactic acid [ ] b) Tea
c) Curd
A) a, b
B) b, c
C) a, c
D) c, a
Answer:
C) a, c

Question 37.
Which one is used as an anti acid?
A) Mg(OH)₂
B) CuSO₄
C) AlSO₄
D) HCl
Answer:
A) Mg(OH)₂

Question 38.
Common name of ‘Magnesium Hydroxide’ is
A) King of chemical
B) Milk of Magnesium
C) Soap maker
D) Glass cleaner
Answer:
B) Milk of Magnesium

Question 39.
Chemical name of lime water is
A) Calcium hydroxide
B) Atnmonium Hydroxide
C) Sodium Hydroxide
D) Magnesium Hydroxide
Answer:
A) Calcium hydroxide

Question 40.
Base present in the soaps is
A) Calcium hydroxide
B) Ammonium Hydroxide
C) Sodium Hydroxide
D) Magnesium Hydroxide
Answer:
C) Sodium Hydroxide

Question 41.
What is the indicator used in this activity?

A) Lemon leaves
B) Methyl orange
C) Lemon juice
D) Blood
Answer:
B) Methyl orange

Question 42.
Reaction colour of Methyl orange with acids is
A) Red
B) Yellow
C) Pink
D) Black
Answer:
A) Red

Question 43.
Reaction colour of Methyl orange with base is
A) Yellow
B) Pink
C) Orange
D) Blue
Answer:
A) Yellow

Question 44.
Which indicator is colourless in acids?
A) Methyl orange
B) Phenolphthalein
C) Turmeric
D) Lemon juice
Answer:
B) Phenolphthalein

Question 45.
Which gas is discovered by Henry Cavendish?
A) H₂
B) O₂
C) Cl₂
D) Li
Answer:
A) H₂

Question 46.
The copper is coated with
A) Iron
B) Ledoxide
C) Tin
D) Steel
Answer:
C) Tin

Question 47.
Here the tested gas is

A) O₂
B) H₂
C) H₂O
D) Cl₂
Answer:
B) H₂

Question 48.
In this experiment the releasing gas is

A) O₂
B) H₂
C) CO₂
D) H₂O
Answer:
C) CO₂

Question 49.
When a magician cuts the lemon with the knife, it becomes red in colour. The material used on the knife may
A) Salt
B) Methyl orange
C) Rel litmus
D) Lime water
Answer:
B) Methyl orange

Question 50.
Methyl orange converts acids into X colour and bases to Y colour. What are X and Y
A) red, violet
B) violet, yellow
C) yellow, violet
D) red, yellow
Answer:
D) red, yellow

Question 51.
You find some stains on the mirror in your house. Which of these is used to remove the stains?
A) Ammonia
B) Ammonium Hydroxide
C) Phenolphthalein
D) Mythyl orange
Answer:
B) Ammonium Hydroxide

Question 52.
Basic solution converts red litmus into blue litmus. If you add the substance given below reverse happens
A) Baking Soda
B) Lime
C) Hydrochloric acid
D) Ammonium hydroxide
Answer:
C) Hydrochloric acid

Question 53.
Acid used in pulihora
A) Carbonic
B) Acetic acid
C) Citric acid
D) Oxalic acid
Answer:
C) Citric acid

Question 54.
The scientist who discovered hydrogen gas is
A) Joseph Priestly
B) Hendry Cavendish
C) Charles Darwin
D) Ernest Rutherford
Answer:
B) Hendry Cavendish

Question 55.
The following is acidic in nature
A) Grape juice
B) Bleaching powder solution
C) Soap solution
D) Lime water
Answer:
A) Grape juice

Question 56.
Identify the correct set of natural indicators.
A) Cucumber & melon
B) Turmeric & vinegar
C) Turmeric & rose petals
D) Hibiscus & melon
Answer:
C) Turmeric & rose petals