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Q.

Phosphine on decomposition produces phosphorus and hydrogen. When 100 ml of phosphine is decomposed the change in volume under laboratory conditions is

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a

900 ml decrease

b

50 ml increase

c

50 ml decrease

d

75 ml increase

answer is A.

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Detailed Solution

2PH3  →2P(s)+3H22L        →3L100ml  →150mL
∴Change in volume = 50 mL increase.

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