Assertion :High concentration Sulphide gives positive test with sodium nitroprusside. Reason: Acidified $H_{2} S$ gives negative test with sodium nitroprusside.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
When sodium nitroprusside is made to react with silfide ions, a deep violet coloration is formed. This coloration is of a complex anion i.e. ${[F e C N)_{5} N O S]}^{- 4}$ .
Also, when $H_{2} S$ is acidified, formation of the complex anion is no morepossible, which was responsible for the deep violet coloration.
Thus, it gives negetive test with $S o d i u m$ $n i t r o p r u s s i d e$ .

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Assertion :High concentration Sulphide gives positive test with sodium nitroprusside. Reason: Acidified H2S gives negative test with sodium nitroprusside.

Assertion :High concentration Sulphide gives positive test with sodium nitroprusside. Reason: Acidified $H_{2} S$ gives negative test with sodium nitroprusside.