A) to decrease \[O{{H}^{-}}\]concentration
B) to increase \[O{{H}^{-}}\]concentration
C) for making HCI
D) statement is wrong
Correct Answer: A
Solution :
Addition of \[N{{H}_{4}}Cl\] before adding \[N{{H}_{4}}OH\] decrease [\[O{{H}^{-}}\]] ion due to common ion effect.
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