Q.

Excess of diliute sodium hydroxide solution is gradually added with shaking to an aqueous solution of zinc sulphate. What would you observe?

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a

A light blue precipitate is first formed which finally dissolves to give a deep blue solution

b

A white precipitate appears which dissolves to give a colourless solution

c

A white precipitate is formed which does not dissolve

d

No change takes place and the solution remain clear

answer is B.

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Detailed Solution

When dilute sodium hydroxide solution is gradually added with shaking to an aqueous solution of ZnSO4, initially white precipitate is formed, which dissolves to give a colourless solution  due to the formation of sodium zincate
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