Question

a piece of calcium is dropped
into dilute acid.​

Answer 1

Answer:

1. When a piece of calcium is dropped in water, it reacts with water and liberates hydrogen in the form of bubbles which brings the calcium upwards and makes it to float.

2. when sodium is kept in water, it reacts and ignites.

3. When iron nail is displaced in copper sulphate solution, it displaces copper and changes the colour of the solution.

4. when potassium is dropped in cold water, it reacts with water and catches fire.

Explanation:

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