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Q.

4 mole of NH4OH and 1 mole of H2SO4 are mixed with enough water to get 1L solution. The pH of the solution is [pkb of NH4OH = 4.8]  

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a

4.8

b

11.2

c

9.8

d

9.2

answer is B.

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Detailed Solution

2NH4OH+H2SO4NH42SO4+2H2O

η . GE of salt formed = 2

η .GE of NH4OH Of left end = 2
 pOH = 4.8 + log log22 
          = 4.8
 pH = 9.2

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