Assertion (A): Calcium salt solution does not show any change even after adding an excess of ammonia solution to it.

Reason (R): The low concentration of hydroxide ion in ammonium hydroxide solution which are unable to precipitate the hydroxide ions of calcium

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): 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): Oxides of most of the metals are basic in nature.

Reason (R): All metal oxides dissolve in water forming alkalis.

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.