Assertion (A): Hydrogen is a neutral gas but it cannot be dried by concentrated sulphuric acid.

Reason (R): The gas reacts with this acid.

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 organic compound prepared when calcium carbide reacts with water:

1. Methane
2. Ethane
3. Acetylene
4. Ethene

A strong electrolyte is:

1. Alcohol
2. Potassium hydroxide
3. Ammonium hydroxide
4. Glucose

The salt which in solution gives a pale green precipitate with sodium hydroxide solution and a white precipitate with barium chloride solution is:

1. Iron (III) sulphate
2. Iron (II) sulphate
3. Iron (II) chloride
4. Iron (III) chloride