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: 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.