Which of the following property is generally not shown by metals?

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

(i) Good thermal conductivity

(ii) Good electrical conductivity

(iii) Ductility

(iv) High melting point 

What happens when calcium is treated with water?

(i) It does not react with water.

(ii) It reacts violently with water.

(iii) It reacts less violently with water.

(iv) Bubbles of hydrogen gas formed stick to the surface of calcium.

Which of the following are not ionic compounds?

(i) $\mathrm{KCl}$

(ii) $\mathrm{HCl}$

(iii) ${\mathrm{CCl}}_4$

(iv) $\mathrm{NaCl}$