A) \[{{10}^{-7}}\]
B) \[>{{10}^{-7}}\]
C) \[<{{10}^{-7}}\]
D) \[{{10}^{-14}}\]
Correct Answer: A
Solution :
\[{{K}_{2}}S{{O}_{4}}\] is a salt of strong acid and strong base. \[2{{K}^{+}}+SO_{4}^{2-}+2{{H}_{2}}O2{{K}^{+}}+2O{{H}^{-}}\] \[+2{{H}^{+}}+SO_{4}^{2-}\] \[2{{H}_{2}}O2{{H}^{+}}+2O{{H}^{-}}\] Thus, its aqueous solution will be neutral with \[pH7\] (or \[{{H}^{+}}=1\times {{10}^{-7}}\])
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