Separate samples of anhydrous copper(II) sulfate and hydrated copper(II) sulfate are heated.
Which row shows the correct colour changes?

Anhydrous copper(II) sulfate - blue to white, hydrate copper(II) sulfate - white to blue

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Anhydrous copper(II) sulfate - no change, hydrate copper(II) sulfate - blue to white

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Anhydrous copper(II) sulfate - white to blue, hydrate copper(II) sulfate - blue to white

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Anhydrous copper(II) sulfate - white to blue, hydrate copper(II) sulfate - no change

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Solution

The correct option is A Anhydrous copper(II) sulfate - no change, hydrate copper(II) sulfate - blue to white
eating the $C u S O_{4} .5 H_{2} O$ crystals causes then to loose the water of crystallisation that is the $5 H_{2} O$ part. It becomes anhydrous copper sulphate. Its colour changes to white from blue.

Further heating the anhydrous copper sulphate may cause it to undergo decomposition and form a black substance which is copper(II) oxide along with it oxygen and sulphur dioxide gases are also formed.

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2.5 g

C u O + H_{2} {S O}_{4} \to {C u S O}_{4} + H_{2} O

Anhydrous Copper sulfate is ______ in colour.

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