Assertion :Unreacted ${A g N O}_{3}$ of photographic plate is removed by ${N a}_{2} S_{2} O_{3}$ (hypo). Reason: ${N a}_{3} [{A g (S_{2} O_{3})}_{2}]$ is soluble complex.

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 incorrect but Reason is correct

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is incorrect but Reason is correct
Unreacted ${A g B r}$ of photographic plate is removed by ${N a}_{2} S_{2} O_{3}$ (hypo).
${N a}_{3} [{A g (S_{2} O_{3})}_{2}]$ is soluble complex.
$A g B r (s) + 2 N a_{2} S_{2} O_{3} \to N a_{3} [A g (S_{2} O_{3})_{2}] (S o d i u m a r g e n t o t h i o s u l p h a t e) + N a B r$
Thus assertion is incorrect but reason is correct.

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