Assertion :NaCl crystal is sometimes yellow in colour. Reason: $N a^{+}$ in the crystal absorbs electron from air and hence, gives yellow colour.

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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Solution

The correct option is C Assertion is correct but Reason is incorrect
$N a C l$ crystal is sometimes yellow in colour due to an excess of sodium.
In $N a C l$ crystal, some chloride ions are missing forming holes. These holes are occupied by electrons to maintain electrical neutrality. The holes occupied by electrons are called F-centres and are responsible for the colour of the compound.
Hence, Assertion is correct but Reason is incorrect.

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