Question

10. Consider the following statements:
(a) Both acids and bases change colour of all indicators.
(b) If an indicator gives a colour change with an acid, it does not give a change with a base.
(c) If an indicator changes colour with a base, it does not change colour with an acid.
(d) Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
(i) All four
(ii) a and d
(iii) b and c
(iv) only d

B. State ‘True’ or ‘False’:
1. Nitric acid turns red litmus blue. False
2. Sodium hydroxide turns blue litmus red. False
3. Sodium hydroxide and hydrochloric acid neutralize each other and form salt and water. False
4. Indicator is a substance which shows different colours in acidic and basic solutions. True
5. Tooth decay is caused by the presence of a base. False
6. Both acids and bases change colour of all indicators. False

Answer 1

Answer:

1 st.) iv)

B. State ‘True’ or ‘False’:

1. Nitric acid turns red litmus blue. False

2. Sodium hydroxide turns blue litmus red. False

3. Sodium hydroxide and hydrochloric acid neutralize each other and form salt and water. False

4. Indicator is a substance which shows different colours in acidic and basic solutions. True

5. Tooth decay is caused by the presence of a base. False

6. Both acids and bases change colour of all indicators. False

Answer 2

Answer: (iv) Only (d) is correct

These indicators are a different colour in a basic environment than in an acidic environment. Since indicators are chemical compounds that change colour according to the pH of the solution they are put in. Examples: Litmus paper and Methyl orange.

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