100 cm³ of oxygen is made to react with 50 cm ³ of hydrogen, and the whole reaction mixture was then passed through anhydrous calcium chloride. What is the volume of gas left?

5 cm³

25 cm³

50 cm³

75 cm³

100 cm³

Correct answer is D

2H₂ + O₂ → 2H₂O
2V₃ 1V₃ 2V
50cm 100 —
50cm 25cm³ 50cm³
Volume of gas left = (100 - 25)cm³ of O₂ = 75 cm³ of O₂

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100 cm3 of oxygen is made to react with 50 cm 3 of hydrogen, and the whole reaction mixture was then passed through anhydrous calcium chloride. What is the volume of gas left?