Assertion (A): Iron (II) salt solution when reacted with ammonium hydroxide forms a dirty green precipitate.

Reason (R): Iron salts are brown in colour.

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.

Assertion (A): Hydrogen gas is liberated when metals like Zn, Al, Pb react with caustic alkalies.

Reason (R): Alkalies are soluble in water.

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.

Assertion (A): Zinc oxide reacts with acids as well as bases to form salt and water.

Reason (R): Zinc oxide is amphoteric in nature.

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.

Fill in the blanks sentence case:

(a) …………… (AgCl/PbCl₂) is a white precipitate soluble in excess of NH₄OH.

(b) Addition of sodium hydroxide solution to ferrous sulphate solution produces a …………… (green/reddish brown) precipitate which is …………… (soluble/insoluble) in excess of NaOH solution.

(c) Ammonium chloride and sodium chloride can be distinguished by heating them with an …………… (acid/alkali).

(d) Element …………… (Fe/Zn/Cu) produces hydrogen by reacting with both acid as well as alkali.