Assertion :Potassium and sodium reacts with water. Reason: Both $N a$ and $K$ liberate $H_{2}$ on reacting with water.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.

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Assertion is correct, but Reason is incorrect.

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Assertion is incorrect, but Reason is correct.

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Solution

The correct option is B Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.
Potassium and sodium react with water because sodium and potassium are highly reactive.

Na and K liberate $H_{2}$ on reacting with water because very reactive metal displaces hydrogen and form metal hydroxide.

$2 K P o t a s s i u m + 2 H_{2} O \to 2 K O H P o t a s s i u m h y d r o x i d e + H_{2}$

$2 N S o d i u m + 2 H_{2} O \to 2 N a O H S o d i u m h y d r o x i d e + H_{2}$

$R e a c t i v e m e t a l + w a t e r \to M e t a l h y d r o x i d e + H y d r o g e n$

Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion.

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