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Classifying Reactions into Physical or Chemical Changes

Viva Questions

Ques 1: How does the colour of the solution change when an iron nail is dipped in copper sulphate solution?
Ans 1: The colour of the solution changes from blue to green.

Ques 2: Why does the colour of iron nail change when it is dipped in copper sulphate solution?
Ans 2: The colour of the iron nail changes from grey to brown due to the deposition of copper on it.

Ques 3: Name the type of reaction which takes place between iron nail and copper sulphate solution.
Ans 3: Single displacement reaction

Ques 4: Give the chemical equa…

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