Assertion (A): Sodium hydrogen carbonate is used as an ingredient in antacids.

Reason (R): NaHCO₃ is a mild non-corrosive basic salt.

1. Both A and R are true, and R is the correct explanation of A.
2. Both A and R are true, and 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): Nitrogen is an essential element for plant growth and is taken up by plants in the form of inorganic nitrates or nitrites.

Reason (R): The soil is the nearest and richest source of raw materials like Nitrogen, Phosphorus and other minerals for the plants.

1. Both A and R are true, and R is the correct explanation of A.
2. Both A and R are true, and R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Which of the following salts do not have the water of crystallisation?

(i) Bleaching Powder

(ii) Plaster of Paris

(iii) Washing soda

(iv) Baking soda

1. (ii) and (iv)
2. (i) and (iii)
3. (ii) and (iii)
4. (i) and (iv)

Assertion (A): Sun appears reddish at the time of Sunrise and Sunset.

Reason (R): Distance travelled by sunlight in the atmosphere is lesser during sunrise and sunset as compared to noon.

1. Both A and R are true, and R is the correct explanation of A.
2. Both A and R are true, and R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.