Question

Q.6) When Calcium reacts with water it starts floating on top of water Because
a) Bubbles of carbon dioxide formed stick to the surface of metal
b) Bubbles of hydrogen formed stick to the surface of metal
c) Calcium is lighter than water
d) None of the above​

Answer 1

Answer:

b) Bubbles of hydrogen formed stick to the surface of metal .

Explanation:

Reaction of calcium metal with water - When calcium metal reacts with water, it reacts less violently. It produces a hydroxide known as calcium hydroxide (a cloudy white precipitate), and the bubbles of hydrogen gas produced are stuck to the surface of calcium. Due to which it floats over the water surface.

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