The empirical formula of the compound is CH₂O, the possible molecular formula can be:

1. C₃H₆O₃

2. C₂H₄O

3. C₄H₃O₂

4. C₄H₆O₂

If relative molecular mass of butane (C₄H₁₀) is 58, then its vapour density will be:

1. 5

2. 29

3. 32

4. 16

The ratio between the number of molecules in 2 g of hydrogen and 32 g of oxygen is:
[Atomic mass: H=1, o=16]

1. 1:2

2. 1:0.01

3. 1:1

4. 0.01:1

One mole of sulphur dioxide represents which of the following?

P 22.4 litres at STP

Q 6.02 x 10²³ atoms

R 6.02 x 10²³ molecules

1. Only P

2. Only Q

3. Both P and Q

4. Both P and R