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Q.

If 30 ml of H2 and 20 ml of O2 react to form water. What is left at the end of the reaction. 

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a

10 ml of H2

b

5 ml of H2

c

5 ml of O2

d

10 ml of O2

answer is D.

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Detailed Solution

2H2+O22H2O
2 mole 1 mole 
30 ml 15 ml 
Volume of O2 left = 20-15 = 5 m

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