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Question

Assertion :PbS is insoluble in excess of NaOH. Reason: PbS has low solubility product than lead hydroxide.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
PbS i.e. lead sulfide is insoluble in excess of NaOH (sodium hydroxide). This is because, lead sulfide has a low solubility product which makes it insoluble when sodium hydroxide is used in excess.
Also, PbS has low solubility product than lead hydroxide i.e. Pb(OH)2.

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