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Standard XII

Chemistry

Oxyacids Of Sulphur

Assertion: ...

Question

Assertion: $N a_{2} S_{2} O_{3}$ is a salt of unstable acid.
Reason: $H_{2} S_{2} O_{3}$ is a polyprotic acid.

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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Both Assertion and Reason are incorrect

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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
$N a_{2} S_{2} O_{3}$ is a salt of $H_{2} S_{2} O_{3}$ and $N a O H$ and $H_{2} S O_{3}$ is unstable acid.
Also $H_{2} S O_{3}$ is a polyprotic acid.

Hence,option B is correct.

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Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
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(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
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Assertion: Na2S2O3 is a salt of unstable acid.Reason: H2S2O3 is a polyprotic acid.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionNa2S2O3 is a salt of H2S2O3 and NaOH and H2SO3 is unstable acid.Also H2SO3 is a polyprotic acid.Hence,option B is correct.

Assertion: $N a_{2} S_{2} O_{3}$ is a salt of unstable acid.
Reason: $H_{2} S_{2} O_{3}$ is a polyprotic acid.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
$N a_{2} S_{2} O_{3}$ is a salt of $H_{2} S_{2} O_{3}$ and $N a O H$ and $H_{2} S O_{3}$ is unstable acid.
Also $H_{2} S O_{3}$ is a polyprotic acid.

Hence,option B is correct.