Class 11

1. Some basic concepts of chemistry question bank (Chemistry)

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Q1.

Air contains nearly 20% oxygen by volume. The volume of air needed for complete

combustion of 100 mL of acetylene will be:

(A)

500 mL

(B)

100 mL

(C)

250 mL

(D)

1250 mL

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Q2.

Elements A and B form two compounds B₂A₃ and B₂A.
0.05 moles of B₂A₃ weigh 9.0 g and 0.10 mole of B₂A weigh 10 g.
Atomic weights of A and B are:

(A)

20 and 30

(B)

30 and 40

(C)

40 and 30

(D)

30 and 20

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