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20mL of 0.1M(H(2)SO(4))solution is added...

20mL of `0.1M(H_(2)SO_(4))`solution is added to 30mL of `0.2M(NH_(4)OH)` soulution. The `._(p)H` of the resultant mixture is : `[._(p)k_(b) " of " NH_(4)OH=4.7]`.

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