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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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Knowledge Check

  • Which happens when magnesium 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 the metal

    A
    (i) and (iv)
    B
    (ii) and (iii)
    C
    (i) and (ii)
    D
    (iii) and (iv)

  • What happens when calcium carbide is treated with water?

    A
    Ethane is formed
    B
    Methane and ethane are formed
    C
    Ethyne is formed
    D
    Ethene and ethyne are formed.

  • Which does not react with water?

    A
    `B_(2)S_(3)`
    B
    `B_(4)C`
    C
    `Al_(4)C_(3)`
    D
    `Al_(2)S_(3)`

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