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Question Q130) Change in volume when 100 mL PH3 decomposed to solid phosphorus and H2 gas.


4PH3 → P4 + 6H2( as Phosphorus is Tetra atomic molecules)
4 mL of PH3 gives 6mL of H2
∴ 100 mL of PH2 gives 150mL of H2
Increase in volume = 150-100 =50 mL
Answer : (a)