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Introduction to Oxidation and Reduction

An acidic sol...

Question

An acidic solution contains ${C u}^{2 +}, {P b}^{2 +}$ and ${Z n}^{2 +}$ . If hydrogen sulphide gas is passed through this solution, the precipitate will contain:

A

C u S

and

Z n S

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B

P b S

and

Z n S

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C

C u S

and

P b S

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D

C u S, P b S

and

Z n S

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Solution

The correct option is B $C u S$ and $P b S$
Hydrogen sulphide gas can be used to precipitate $C u^{2 +} a n d P b^{2 +}$ and also $A g^{+}$ in acidic medium.

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Q. An acidic solution contains

C u^{2 +} P b^{2 +}

Z n^{2 +}

. If hydrogen sulphide gas is passed through this solution the percipitate will contain:

H_{2} S

gas is passed through a hot acidic aqueous solution containing

A l^{3 +}, C u^{2 +}, P b^{2 +} a n d N i^{2 +}

, a precipitate is formed which consists of

Q. A solution containing

0.1 M

{Z n}^{2 +}

0.01 M

{C u}^{2 +}

H_{2} S

S^{2 -}

concentration is

8.1 \times 10^{- 31} M

Z n S

C u S

K_{s p} (Z n S) = 3.0 \times 10^{- 23}

K_{s p} (C u S) = 8.0 \times 10^{- 4}

C u

is precipitated as

C u S

Z n

is not precipitated when

H_{2} S

is passed through an acidic solution of

C U (N O_{3})_{2}

Z n (N O_{3})_{2}

H_{2} S

into a solution containing both

Z n^{2 -}

C u^{2 -}

in acidic medium, only CuS gets precipitated. This is because :

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