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Question

What is the effect of shaking dilute sulphuric acid with a small quantity of colourless anhydrous copper sulphate?

A
The solid dissolves to give a colourless solution
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B
The solid dissolves to give a blue soluton
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C
The solid turns blue but does not dissolve
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D
The solid dissolves to give a red solution
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Solution

The correct option is D The solid dissolves to give a blue soluton
Copper(II) oxide, a black solid, and colourless dilute sulphuric acid react to produce copper (II) sulphate, giving a characteristic blue colour to the solution. From this solution, blue copper(II) sulfate pentahydrate crystals may be obtained if desired.

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