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Acids, Bases and Salts - 2

Questions for 10th grade covering Indicators, Acids, Bases, and Salts with their laboratory preparations

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following terms correctly represents an indicator?

  1. An indicator is a dye that does not change colour when it is put into an acid or base.
  2. An indicator is a dye that changes colour when it is put into an acid or base.
  3. An indicator is a dye that change colour only when it is put into an acid.
  4. An indicator is a dye that changes colour only when it is put into an base.
  5. None of these
Question 2 Multiple Choice (Single Answer)

Methyl orange indicator gives _______ colour in strong acid solution.

  1. blue
  2. pink
  3. purple
  4. red
  5. green
Question 3 Multiple Choice (Single Answer)

What is the colour of phenolphthalein indicator in neutral state?

  1. It is blue in colour.
  2. It is pink in colour
  3. It is colourless
  4. It is red in colour
  5. None of these
Question 4 Multiple Choice (Single Answer)

If a drop of a solution turns blue litmus to red, what is the nature of the soiution?

  1. The given solution will be acid
  2. The given solution will be base
  3. The given solution may be acid or base
  4. The given solution is neither acid nor base
  5. None of these
Question 5 Multiple Choice (Single Answer)

Which of the following is not an indicator?

  1. Litmus
  2. Methyl orange
  3. Turmeric
  4. Phenolphthalein
  5. None of these
Question 6 Multiple Choice (Single Answer)

Presence of which of the following results in sour taste of lemon?

  1. Base
  2. Acid
  3. Indicator
  4. Salt
  5. All of the above
Question 7 Multiple Choice (Single Answer)

Which of the foliowing indicators is red in colour but turns green on adding to base solution?

  1. Litmus
  2. Turmeric
  3. Cabbage extract
  4. Phenolphthalein
  5. None of these
Question 8 Multiple Choice (Single Answer)

Which of the following acids is present in plant materials and animals?

  1. Mineral acid
  2. Hydrochloric acid
  3. Sulphuric acid
  4. Organic acid
  5. None of these
Question 9 Multiple Choice (Single Answer)

For the manufacture of which of the following substances is beaching powder used?

  1. Toys
  2. Cosmetics
  3. Chloroform
  4. Fire-proofing materials
  5. None of these
Question 10 Multiple Choice (Single Answer)

How many molecules of water of crystallisation are present in a formula unit of iron sulphate crystals?

  1. 10
  2. 5
  3. 2
  4. 7
  5. None of these
Question 11 Multiple Choice (Single Answer)

Which of the following terms correctly represents bleaching powder?

  1. Calcium hydroxide
  2. Calcium sulphate
  3. Calcium oxychloride
  4. Slaked lime
  5. None of these
Question 12 Multiple Choice (Single Answer)

Which of the following is the molecular formula of Plaster of Paris?

  1. CaSO4.2H2O
  2. 2CaSO4.H2O
  3. CuSO4.5H2O
  4. CuSO4
  5. None of these
Question 13 Multiple Choice (Single Answer)

In the manufacture of which of the following substances is/are mineral acid(s) used?

  1. Plastic
  2. Car batteries
  3. Dyes
  4. TNT (Tri-Nitro Toluene)
  5. All of the above
Question 14 Multiple Choice (Single Answer)

Which of the following is not hydrated salt?

  1. CuSO4.5H2O
  2. Na2CO3.10H2O
  3. CaSO4.2H2O
  4. FeSO4.7H2O
  5. None of these
Question 15 Multiple Choice (Single Answer)

What is the real bleaching agent present in bleaching powder?

  1. Sulphur
  2. Chlorine
  3. Hydroxide
  4. Sulphate
  5. None of these
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