When 2 mL of sodium hydroxide solution is added to few pieces of granulated zinc in a test tube and then warmed, the reaction that occurs can be written in the form of a balanced chemical equation as :

options

1. NaOH + Zn → NaZnO₂ + H₂O
2. 2NaOH + Zn → Na₂ZnO₂ + H₂
3. 2NaOH + Zn → NaZnO₂ + H₂
4. 2NaOH + Zn → Na₂ZnO₂ + H₂O

A metal and a non-metal that exists in liquid state at the room temperature are respectively:

options

1. Bromine and Mercury
2. Mercury and Iodine
3. Mercury and Bromine
4. Iodine and Mercury

Carbon compounds :

(a) are good conductors of electricity.

(b) are bad conductors of electricity.

(c) have strong forces of attraction between their molecules.

(d) have weak forces of attraction between their molecules.

The correct statements are:

options

1. (a) and (b)
2. (b) and (c)
3. (b) and (d)
4. (a) and (c)

Consider the following compounds :

FeSO₄; CuSO₄; CaSO₄; Na₂CO₃

The compound having maximum number of water of crystallisation in its crystalline form in one molecule is :

options

1. FeSO₄
2. CuSO₄
3. CaSO₄
4. Na₂CO₃