100 mL of PH(3) on decomposition produce...

100 mL of `PH_(3) on decomposition produced phosphorus and hydrogen. The change in volume is :-

Increase in 50 ml

Decrease in 50 mL

Increase in 150 mL

Decrease in 200 ml

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100 mL of phosphine (PH_(3)) on hearing forms phosphorous (P) and hydrogen (H_(2)) . The volume change in the reaction is

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