Assertion (A): Acetic acid has four hydrogen atoms in its molecule but its basicity is one.

Reason (R): Acetic acid has only one replaceable hydrogen atom.

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 hydroxide which is soluble in excess of NH₄OH is:

1. Ferric hydroxide
2. Lead hydroxide
3. Copper hydroxide
4. Calcium hydroxide

The drying agent used to dry Ammonia is:

1. Concentrated Sulphuric acid
2. Calcium oxide
3. Sulphurous acid
4. Calcium hydroxide

The percentage of nitrogen present in urea (NH₂)₂CO is: [R.A.M. of N = 14, C= 12, O = 16, H = 1]

1. 23.36
2. 46.67
3. 19.35
4. 43.87