Question

100 ml of PH, on heating forms Pand H. The volume change in the reaction is
(a) an increase or 50 ml
(b) an increase of 100 ml
(2) an increase of 150 ml
(d) a decrease of 50 ml
the mass of Alin (Atomic mass of AI
AL​

Answer 1

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Explanation:

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CHEMISTRY

100 ml of PH

3

when decomposed produces phosphorus and hydrogen. The change in volume is:

December 20, 2019

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Angèliña Hazarika

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ANSWER

The equation for the decomposition is:

4PH

3

(g)→P

4

(s)+6H

2

(g) (Elemental phosphorus exists as tetra-atomic molecules).

When the temperature and pressure remain the same, 4 ml of PH

3

will give 6 ml of H

2

. (On applying Gay-Lussac's law ).

Hence, 100 ml of PH

3

will yield 150 ml of H

2

.

Increase in volume = (150-100) ml = 50 ml. (The volume of solid phosphorus is negligible).

Hence, the correct option is A