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Byju's Answer

Standard XII

Chemistry

Magnetic Properties

Assertion :Th...

Question

Assertion :The test of the second group with the sulfide ion must be conducted in the presence of dilute $H C l$ . Reason: $H C l$ gives the proper buffer solution that controls the concentration of sulphide so that precipitation of further group cation can be ceased.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Test of second group with $s u l f i d e$ ion must be conducted in the presence of diluto $H C l$ . This is because it keeps the $s u l f i d e$ ion concentration at required minimum & allows the precipitation of second group cations alone. If dilute acid is not used, early precipitation of third group cation may occur.

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Assertion :The test of the second group with the sulfide ion must be conducted in the presence of dilute HCl. Reason: HCl gives the proper buffer solution that controls the concentration of sulphide so that precipitation of further group cation can be ceased.

Assertion :The test of the second group with the sulfide ion must be conducted in the presence of dilute $H C l$ . Reason: $H C l$ gives the proper buffer solution that controls the concentration of sulphide so that precipitation of further group cation can be ceased.