Assertion (A): The RMM of a gas is 64, then its vapour density is 32.

Reason (R): RMM is twice the vapour density.

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.

The metals zinc and tin are present in the alloy

1. Solder
2. Brass
3. Bronze
4. Duralumin

The IUPAC name of acetaldehyde is:

1. Ethanoic acid
2. Methanal
3. Ethanal
4. Ethanol

The alkaline earth metal of period 3 is:

1. Mg
2. Ca
3. Na
4. K