A. 85cm3
B. 50cm3
C. 125cm3
D. 55cm3

Correct Answer:

Option B – 50cm3


Since 2 mol H2 reacted with 1 mol of O2
: 50cm3 of hydrogen reacted with 25cm3 of oxygen

Remainder oxygen = Supplied amount – Reacted amount → 75cm3 – 25cm3 = 50cm3

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