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Question

NH4CN is a salt of weak acid HCN (Ka=6.2×1010) and a weak base NH4OH(Kb=1.8×105). A one molar solution of NH4CN will be:

A
neutral
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B
strongly acidic
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C
strongly basic
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D
weakly basic
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Solution

The correct option is B weakly basic
Smaller the pKa , the stronger the acid. Very strong acids have pKa less than 1, moderately strong acids have pKa in between 1 to 5 and weak acids have pKa above 5.

Ka is directly proportional to the H+ concentration and Kb is directly proportional to the OH concentration.

In this case since Kb>Ka and Kb<<1,NH4CN is weakly basic.

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