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Chemical Reactivity (Group 1)

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 percipitate will contain:

A

CuS and ZnS

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B

PbS and ZnS

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C

CuS and PbS

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D

CuS, PbS and ZnS

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Solution

The correct option is B CuS and PbS
ZnS is soluble in acidic solution. Hence, it cannot be precipitated from acidic solution. However, it can be precipitated from alkaline solution and to some extent from neutral solution. CuS and PbS can be precipitated from acidic solution.
Thus, the treatment of hydrogen sulfide with a solution containing ions of copper, zinc and lead will precipitate CuS and PbS.

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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 precipitate 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

H_{2} S

gas is passed through a hot acidic aqueous solution containing

A l^{3 +}, C u^{2 +}, P b^{2 +}

N i^{2 +}

, a precipitate is formed which consists of:

Q. Assertion: A solution contains 0.1 M each of

P b^{2 +}, Z n^{2 +}, N i^{2 +}

H_{2} S

is passed into this solution at

25^{o} C

P b^{2 +}, N i^{2 +}, Z n^{2 +}

will get precipitated simultaneously.
Reason:

P b^{2 +}

Z n^{2 +}

will get precipited if the solution contains 0.1 M HCl.

[K_{1} H_{2} S = 10^{- 7}, K_{2} H_{2} S = 10^{- 14}, K_{s p} P b S = 3 \times 10^{- 29} K_{s p} N i S = 3 \times 10^{- 19} . K_{s p} Z n S = 10^{- 25}]

Q. During the qualitative analysis of a mixture containing

{C u}^{2 +}

{Z n}^{2 +}

ions, which gas is passed through an acidified solution containing these ions in order to test

{C u}^{2 +}

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