What do you understand by the following terms (i) roasting (ii) smelting

What do you understand by gene ?

What do you understand by pitch of sound ?

What do you understand by food poisoning?

What do you understand by fertilisation ?

What do you understand by algal bloom ?

What do you understand by the dual character of matter?

What do you understand by colligative properties?

What do you understand by the following statements ? enthalpy of combustion of carbon disulphide is = -1065.2 kJ.

What do you understand by the following statements ? enthalphy of formation of nitric oxide is +9.7 kJ.

What do you mean by free fall ?