NCERT Exemplar IV — task. Science CBSE, Class 9.

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Answer the following multiple choice questions:

1. Which of the following contains maximum number of molecules?

1g $H_2$
1g $CO_2$
1g $N_2$
1g $CH_4$

2. Mass of one atom of oxygen is

12 x $6.023$ x $10^2{^3}$ g
16 x $6.023$ x $10^2{^3}$ g
32 x $6.023$ x $10^2{^3}$ g
8 x $6.023$ x $10^2{^3}$ g

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