A) \[KCl\]
B) \[NaCl\]
C) \[N{{a}_{2}}C{{O}_{3}}\]
D) \[CuS{{O}_{4}}\]
Correct Answer: C
Solution :
The highest pH refers to the basic solution containing \[O{{H}^{-}}\] ions. Therefore, the basic salt releasing \[O{{H}^{-}}\] ions on hydrolysis will give highest pH in water. Only the salt of strong base and weak acid would release \[O{{H}^{-}}\] ion on hydrolysis. Among the given sate, \[N{{a}_{2}}C{{O}_{3}}\] corresponds to the basic salt as it is formed by the neutralisation of \[NaOH\] [strong base] and \[{{H}_{2}}C{{O}_{3}}\] [weak acid]. \[CO_{3}^{2-}+{{H}_{2}}O\rightleftharpoons HCO_{3}^{-}+O{{H}^{-}}\]
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