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Reactivity Series

Assertion:- S...

Question

Assertion:- Sodium metal reacts violently with water and burns with a yellow flame.

Reason:- A large amount of heat is generated and hydrogen evolved immediately catches fire.

A

Assertion:- False

Reason:- False

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B

Assertion:- True

Reason:- True

Reason is not the correct explanation of assertion

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C

Assertion:- True

Reason:- True

Reason is the correct explanation of assertion

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D

Assertion:- True

Reason:- False

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Solution

The correct option is C
Assertion:- True

Reason:- True

Reason is the correct explanation of assertion

Sodium metal reacts violently with water to produce sodium hydroxide and hydrogen gas.

$2 N a (s) + H_{2} O (l) \to 2 N a O H (a q) + H_{2} (g)$

This reaction generates a lot of heat (exothermic reaction) which is much above the self-ignition temperature of hydrogen gas and it catches fire and burns with a yellow flame (because sodium metal vapours are also present). Therefore, both the assertion and reason hold true and the reason is the correct explanation of assertion.

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