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Preparations and Uses of Caustic Soda

Assertion A :...

Question

Assertion (A) : 'Al' liberates $H_{2}$ gas with both NaOH and HCl.
Reason (R) : 'Al' is amphoteric metal.

A

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

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B

Both Assertion and Reason are true and Reason is not the correct explanation of Assertion

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C

Assertion is true but Reason is false

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D

Assertion is false but Reason is true

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Solution

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation of Assertion
Amphoteric metals are those metals which react with both acids and bases.
$2 A l + 6 H C l \to 2 A l C l_{3} + H_{2}$
$2 A l + 2 N a O H + 2 H_{2} O \to 2 N a A l O_{2} + 3 H_{2}$

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