• Acids, Bases and Salts - 2
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Acids, Bases and Salts - 2

Description: questions for 10 class IndicatorsAcids & BasesSalts and Their Laboratory Preparations
Number of Questions: 15
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Tags: questions for 10 class Indicators Acids & Bases Salts and Their Laboratory Preparations
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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

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Correct Option: B
Explanation:

Yes, it changes colour when put in acid or base. Like phenolphthalein changes to red colour in base and becomes colourless in acid.

Methyl orange indicator gives _______ colour in strong acid solution.

  1. blue

  2. pink

  3. purple

  4. red

  5. green

Show answer
Correct Option: D
Explanation:

This is the correct option as Methyl orange indicator gives red colour in acid solution

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

Show answer
Correct Option: C
Explanation:

This is the correct option as phenolphthalein indicator has no colour in neutral state.

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

Show answer
Correct Option: A
Explanation:

This is the correct option as drop of acid turns blue litmus to red litmus.

Which of the following is not an indicator?

  1. Litmus

  2. Methyl orange

  3. Turmeric

  4. Phenolphthalein

  5. None of these

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Correct Option: E
Explanation:

This option is correct because all of the above are indicators. 

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

Show answer
Correct Option: B
Explanation:

This is the correct option as the sour taste of lemon is due to the presence of acid.

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

Show answer
Correct Option: C
Explanation:

Cabbage extract is red in colour and turns green on adding to base solution.

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

Show answer
Correct Option: D
Explanation:

This is the correct option as the acid present in plant materials and animals is called organic acid.

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

Show answer
Correct Option: C
Explanation:

Bleaching powder is used for the manufacture of chloroform. Chloroform is prepared in the laboratory and on large scale by distilling ethyl alcohol or acetone with bleaching powder and water. So the given option is correct.

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

Show answer
Correct Option: D
Explanation:

This option is correct as Iron sulphate crystals contain 7 molecules of water of crystallisation per formula unit and written as FeSO4.7H2O.

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

Show answer
Correct Option: C
Explanation:

Bleaching powder (CaOCl2) is calcium oxychloride. So the given option is correct.

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

Show answer
Correct Option: B
Explanation:

This is the correct option as molecular formula of Plaster of Paris is 2CaSO4.H2O.

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

Show answer
Correct Option: E
Explanation:

This is the correct option because all of the above are manufactured by mineral acid. Mineral acid is used in the manufacture of TNT (Tri-Nitro Toluene), dyes, car batteries and plastic.

Which of the following is not hydrated salt?

  1. CuSO4.5H2O

  2. Na2CO3.10H2O

  3. CaSO4.2H2O

  4. FeSO4.7H2O

  5. None of these

Show answer
Correct Option: E
Explanation:

This is the correct option as all of the above are hydrated salts.

What is the real bleaching agent present in bleaching powder?

  1. Sulphur

  2. Chlorine

  3. Hydroxide

  4. Sulphate

  5. None of these

Show answer
Correct Option: B
Explanation:

Chlorine is a bleaching agent present in bleaching powder (CaCl2). So, the given option is correct.

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