Question

1. In the following question an assertion is followed by a statement of reason ASSERTION: A solution of Sulphur dioxide in water turns blue litamus red. REASON: Sulphur dioxide is a basic oxide. Mark the correct choice: a. Both assertion and reason are true, and reason is correct explanation of assertion. b. Both assertion and reason are true, and reason is not the correct explanation of assertion. c. Assertion is true but reason is false. d. Both assertion and reason are false.
Irrelevant answers will be reported.​

Answer 1

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Solution : Both Assertion and Reason are correct as salts are formed by neutralisation reaction. Salts maybe acidic, basic or neutral.

Answer 2

The answer is c)Assertion is true but the reason is false.

Explanation:

Given:

ASSERTION: A solution of Sulphur dioxide in water turns blue litmus red. REASON: Sulphur dioxide is a basic oxide.

To find: Whether assertion and/or reason are correct and reason explains the assertion

Solution:

• According to the assertion, sulfur dioxide when added to water turns blue litmus red.

Let us see the chemical reaction first:

$SO_2(g) + H_2O(g) \rightarrow H_2SO_3(aq)$

• Sulfurous acid is formed in the above reaction. Thus, it is an acid.
• An acid will turn blue litmus red. Thus, the assertion is correct.

Now, let us observe the reason:

• The given reason says that sulfur dioxide is a basic oxide. But, according to the above equation, it is forming an acid. Hence, it is an acidic oxide. Thus, the reason is incorrect.

• So, the answer is c)Assertion is true but the reason is false.