Sodium hydroxide is added drop wise till in excess to a solution of Zinc sulphate. Which of the following observation can be made?

White precipitate is formed which is soluble in excess of sodium hydroxide.

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White precipitate is formed which is insoluble in excess of sodium hydroxide.

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Black precipitate is formed which is soluble in excess of sodium hydroxide.

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Black precipitate is formed which is insoluble in excess of sodium hydroxide.

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Solution

The correct option is A White precipitate is formed which is soluble in excess of sodium hydroxide.
When sodium hydroxide solution is added drop by drop to zinc sulphate solution a white precipitate is formed which is soluble in excess of sodium hydroxide.

$Z n S O_{4} + 2 N a O H \to Z n (O H)_{2} + N a_{2} S O_{4}$

$Z n (O H)_{2} + 2 N a O H \to N a_{2} Z n O_{2} + 2 H_{2} O$

Therefore, option A is correct.

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