Assertion : $S n$ and $P b$ are amphoteric . Reason: Both metals reacts with $N a O H$ (base) as well as $H C l$ (acid), hence are amphoteric.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Both metals reacts with $N a O H$ (base) as well as $H C l$ (acid), hence are amphoteric:
$S n + 2 N a O H + H_{2} O \to N a_{2} S n O_{3} + 2 H_{2}$
$S n + 2 H C l \to S n C l_{2} + H_{2}$
Similarly with lead.
$P b + 2 N a O H + H_{2} O \to N a_{2} P b O_{3} + 2 H_{2}$
$P b + 2 H C l \to P b C l_{2} + H_{2}$
Hence option A is correct.

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Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
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Assertion (A) Ethanol is a weaker acid than phenol.
Reason (R) Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
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Assertion :Sn and Pb are amphoteric . Reason: Both metals reacts with NaOH (base) as well as HCl (acid), hence are amphoteric.

Assertion : $S n$ and $P b$ are amphoteric . Reason: Both metals reacts with $N a O H$ (base) as well as $H C l$ (acid), hence are amphoteric.