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