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Question

Which one of the following is salt buffer ?

A
(NH4CN) solution
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B
(CH3COONH4,) solution
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C
(a) and (b) above.
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D
None of the above
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Solution

The correct option is C (a) and (b) above.
A solution of the salt of weak acid and weak base in water is called salt buffer.
a) Ammonium acetate (CH3COONH4) solution is a salt of weak acid (CH3COOH) and weak base (NH4OH) in water.
b) Ammonium cyanide (NH4CN) solution is a salt of weak acid (HCN) and weak base (NH4OH) in water.
Hence both (a) and (b) option are correct.

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