JEE Main Chemistry question

If NaOH is added to an aqueous solution of ions, a white precipitate appears and on adding excess NaOH, the precipitate dissolves. In this solution zinc exists in the:

(A)Cationic part
(B)Anionic partCorrect
(C)Both in cationic and anionic parts
(D)There is no zinc left in the solution

Answer: (B)

Solution

The initially formed white precipitate dissolves in excess NaOH by forming the soluble zincate ion, (or ), in which zinc is part of a negatively charged complex anion, not present as a simple cation anymore. It is therefore

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Question ID VK-137872