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Standard IX

Chemistry

Physical and Chemical Properties of Hydrogen

Assertion : ...

Question

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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Similar questions

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and

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(1 + \frac{P b}{R T})

Reason: The compressibility factor for

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Q. Assertion: The impurities such as

{SiO}_{2}

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Reason:

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{CaCO}_{3}

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{SiO}_{2}

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Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

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.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not 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.