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Q.

Liquid  NH3 dissociates to a slight extent. At certain temperature, its self-dissociation constant  KSDC(NH3)  is  1030 . The No. of NH4 ions present in pure liquid of 100 CC volume is (NA=6×1023)

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a

1015

b

6×108

c

6×107

d

6×106

answer is C.

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Detailed Solution

2NH3NH2+NH4+ n-2x      x           x KSDC(NH3)=[NH4+][NH2]=10-30 [NH4+][NH2]=10-30 [x][x]=10-30 x=10-15 [NH4+]=10-15

Number of NH4 ions in 100 CC volume:

1015×6×1023×100 cm31000 cm3/L=6×107

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