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प्रश्न
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
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उत्तर
Copper displaces hydrogen from sulphuric acid and forms blue-coloured copper sulphate and hydrogen gas is evolved.
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संबंधित प्रश्न
Define catalyst.
Fill in the blanK
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