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What happens when calcium is treated wit...

What happens when calcium is treated with water ?
(i) It does not react with water.
(ii) It reacts violently with water.
(iii) It reacts less violently with water.
(iv) Bubbles of hydrogen gas formed stick to the surface of calcium

A

`(i) and (iv)`

B

`(ii) and (iii)`

C

`(i) and (ii)`

D

`(iii) and (iv)`

Text Solution

Verified by Experts

The correct Answer is:
D
Celcium reacts less viotently with water and the bubbles of hydrogen gas D'Oduced stuck to the surface of calcium. Due to which it iIoats over water surface. 
`Ca(s)+2H_(2)O(l)tounderset("Calcium hydroxide")(Ca(OH)_(2)(aq))+H_(2)uparrow`
Much less heat isproduced in this reaction due to which hydrogen gas formed does not catchfire.
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