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Question

Copper sulphate is a blue coloured solution which undergoes a chemical change when iron nails are dropped inside it. Which amongst the given indicators will help to identify the chemical change taking place?

A
Evolution of gas
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B
Production of sound
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C
Change in colour
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D
Evolution of heat
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Solution

The correct option is C Change in colour
Blue coloured copper sulphate solution turns green when a small piece of iron is dipped inside it. This indicator confirms the chemical change between them.

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