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AP 7th Class Science Bits Chapter 2 Nature of Substances with Answers

I. Multiple Choice Questions

1. Table salt contains
A) Sodium chloride
B) Sodium bicarbonate
C) Potassium chloride
D) Sodium hydroxide
Answer:
A) Sodium chloride

2. Baking soda contains
A) Sodium chloride
B) Sodium bicarbonate
C) Potassium chloride
D) Sodium hydroxide
Answer:
B) Sodium bicarbonate

3. Gastric juice means
A) Sulphuric acid
B) Citric acid
C) Antacid
D) Hydrochloric acid
Answer:
D) Hydrochloric acid

AP 7th Class Science Bits Chapter 2 Nature of Substances with Answers

4. Sulphuric acid reacts with eggshell and releases
A) Carbondioxide
B) Hydrogen
C) Oxygen
D) None
Answer:
A) Carbondioxide

5. Substance/s formed in a neutralization reaction is/are
A) Water
B) Salt
C) A and B
D) Hydrogen
Answer:
C) A and B

6. Which of the following does not contain acid?
A) lemon
B) Bitter gourd
C) Amla
D) Tomato
Answer:
B) Bitter gourd

7. This acid is present in cool drinks
A) Sulphuric acid
B) Hydrochloric acid
C) Carbonic acid
D) Vinegar
Answer:
C) Carbonic acid

8. Bath soap is prepared using
A) Sodium hydroxide
B) Aluminum hydroxide
C) Calcium carbonate
D) Potassium hydroxide
Answer:
D) Potassium hydroxide

9. Olfactory indicator from the following
A) Hibiscus
B) Phenolphthalein
C) Clove oil
D) Methyl orange
Answer:
C) Clove oil

10. lichens are used in the preparation of
A) Litmus
B) Methyl blue
C) Phenolphthalein
D) Olfactory indicators
Answer:
A) Litmus

AP 7th Class Science Bits Chapter 2 Nature of Substances with Answers

11. Phenolphthalein shows colour change with
A) Acids
B) Bases
C) both A & B
D) Neutral substances
Answer:
B) Bases

12. Which of the following is a strong acid?
A) Citric acid
B) Acetic acid
C) Sulphuric acid
D) Malic acid
Answer:
C) Sulphuric acid

13. This gas is lighter than air
A) Hydrogen
B) Nitrogen
C) Oxygen
D) Carbon dioxide
Answer:
A) Hydrogen

14. Product of neutralisation
A) Salt
B) Water
C) Both A & B
D) Acid
Answer:
C) Both A & B

15. Example for salt
A) Common salt
B) Antacid
C) Tooth paste
D) Clove oil
Answer:
A) Common salt

16. Acid produced in stomach
A) Sulphuric acid
B) Hydrochloric acid
C) Nitric acid
D) Carbonic acid
Answer:
B) Hydrochloric acid

17. This can be used to treat ant bite
A) Baking soda
B) Common salt
C) Vinegar
D) Turmeric
Answer:
A) Baking soda

18. pH of bases
A) 0-14
B) 7
C) more than 7
D) less than 7
Answer:
C) more than 7

19. This is responsible for acid rains
A) Sulphur dioxide
B) Nitrogen dioxide
C) Both A & B
D) Oxygen
Answer:
C) Both A & B

20. Flowers that change their colour according to the nature of soil
A) Hydrangea
B) Marigold
C) Hibiscus
D) Jasmine
Answer:
A) Hydrangea

II. Fill in the blanks.

1. Rain with slight ………….. nature is called acid rains.
2. Wash the affected burning area on skin with ………….. .
3. ………….. will be prepared by adding fatty acids to alkalis.
4. ………….. are used in making soaps.
5. ………….. are used to test the nature of substances.
6. ………….. acid is also called as Vitamin C.
7. ………….. acid is used for bath room cleaning.
8. ………….. acid is used in batteries.
9. Soda water and cool drinks contain ………….. acids.
10. Bases are ………….. to taste.
11. Bath soap is prepared using ………….. .
12. Detergent soap is prepared using
13. Bases that can dissolve in water are called ………….. .
14. The substance which is neither an acid nor a base is known as ………….. .
15. Purewater is a ………….. substance.
16. Substances which are used to test acids or bases are called ………….. .
17. Indicators obtained from natural sources are called as ………….. .
18. The most commonly used natural indicator is ………….. .
19. The colour of turmeric strip will change into ………….. in soap water.
20. Soda water turns into ………….. on adding hibiscus indicator.
21. Soap solutions turns ………….. on adding hibiscus indicator.
22. An indicator prepared from artificialsources is known as ………….. .
23. Methyl orange turns in acids and ………….. in bases.
24. Phenolphthalein turns ………….. in bases, but ………….. in acids.
25. Substances which change their smell when mixed with acid or base are known as ………….. .
26. ………….. is a mixture of different indicators and shows different colours in different solutions.
27. ………….. can show the strength of acid or alkaline substance.
28. Strength of acid or base solution is measured in ………….. scale.
29. pH of acids is ………….. .
30. pH of bases is ………….. .
31. pH of neutral substance is ………….. .
32. Natural acids are ………….. acids.
33. Acids react with metals and release gas.
34. Acids react with ………….. and release carbon dioxide gas.
35. Reaction of an acid and a base is called ………….. reaction.
36. The substances formed in neutralization reaction are ………….. and ………….. .
37. Antacids contain ………….. .
38. When an ant bites, it injects acid into the skin.
39. When soil becomes too acidic, farmers treat it by adding
40. When soil becomes too basic,farmers treat it with
41. Rain water with slight acidic nature is called
42. ………….. acid is used in the preservation of pickles and other food substances.
43. ………….. acid is used in the production of ink and leather.
44. Base used in windows cleaner is ………….. .
45. Magnesium hydroxide is used in ………….. and ………….. .
Answer:

  1. acidic
  2. plenty of water
  3. Soap
  4. Bases
  5. Indicators
  6. Ascorbic
  7. Hydrochloric
  8. Sulphuric
  9. carbonic
  10. bitter
  11. potassium hydroxide
  12. Sodium hydroxide
  13. alkalis
  14. neutral substance
  15. Neutral
  16. acid base indicators
  17. Natural indicators.
  18. litmus
  19. reddish brown
  20. pink
  21. green
  22. Synthetic indicator.
  23. red, yellow
  24. pink, does not change
  25. olfactoryin dicators.
  26. Universal indicatoris
  27.  Universal indicator
  28. pH
  29. less than 7
  30. more than 7
  31. 7
  32. weak
  33. hydrogengas.
  34. calcium carbonate
  35. neutralization reaction.
  36. water, salt
  37. bases.
  38. formic
  39. quick lime/ potassium hydroxide.
  40. compost.
  41. Acid rain.
  42. Acetic
  43. Tannic
  44. Ammonium hydroxide
  45. antacid and laxative

III. Match the following

1.

Group – A Group – B
A) Blue litmus in acid 1) Yellow
B) Methyl orange in base 2) No change
C) Hibiscus in acid 3) Red
D) Phenolphthalein in acid 4) Brown
E) Turmeric in base

Answer:

Group – A Group – B
A) Blue litmus in acid 3) Red
B) Methyl orange in base 1) Yellow
C) Hibiscus in acid 5) Pink
D) Phenolphthalein in acid 2) No change
E) Turmeric in base 4) Brown

2.

Group – A Group – B
A) Hydrangea plants 1) Air pollution
B) Neem 2) pH of the soil
C) pH scale 3) Chew sticks
D) Nitric acid 4) Manufacture of fertilizers
E) Acid rain 5) Automobile battery
6) Sorensen

Answer:

Group – A Group – B
A) Hydrangea plants 2) pH of the soil
B) Neem 3) Chew sticks
C) pH scale 6) Sorensen
D) Nitric acid 4) Manufacture of fertilizers
E) Acid rain 1) Air pollution

3.

Group – A Group – B
A) Antacid 1) Formic acid
B) Ant 2) Salt and water
C) Neutralisation 3) Bases that can dissolve in water
D) Olfactory indicator 4) Stomach
E) Alkalis 5) Hibiscus
6) Clove oil

Answer:

Group – A Group – B
A) Antacid 4) Stomach
B) Ant 1) Formic acid
C) Neutralisation 2) Salt and water
D) Olfactory indicator 6) Clove oil
E) Alkalis 3) Bases that can dissolve in water