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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
What do you observe when iron nail is kept in copper sulphate solution for sometime.
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Explain by writing a word equation.
Respiration is a chemical change.
Give reason for the following:
Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.
Multiple choice:
Which of the following is not a characteristic of a chemical change?
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