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

1. 5

2. 29

3. 32

4. 16

If the empirical mass of the formula PQ₂ is 10 and the relative molecular mass is 30, then the molecular formula will be:

1. PQ₂

2. P₃Q₂

3. P₆Q₃

4. P₃Q₆

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

Assertion (A): According to gas equation,

$\dfrac{\text{P}$1\text{V}1}{\text{T}1} = $\dfrac{\text{P}2\text{V}$2}{\text{T}2}

Reason (R): On combining Boyle's law and Charle's law, 'volume of a given mass of a dry gas varies inversely as the pressure and directly as the absolute temperature."

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.