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Question

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

A
Cationic part
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B
Anionic part
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C
Both in the cationic and anionic parts
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D
Precipitate
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Solution

The correct option is B Anionic part
The reaction occurs is:
2NaOH+Zn2+Zn(OH)2(white ppt.)+2Na+

Zn(OH)2(white ppt.)+2NaOHNa2[Zn(OH)4]

From the above reaction, it can be seen that zinc exists in the anionic part.

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