Explain the following :
(i) Rancidity (ii) Photochemical reaction
(iii) Ignition temperature .

Explain the following : (i) mass number , (ii) atomic number and (iii) isotopes .

Explain the following with examples : (i) Tetravalency (ii) Substitution reaction (iii) Addition reaction (iv) Combustion

Explain the following : (i) satured solution ,(ii) colloidal and (iii) pure substance .

Explain the following term with the help of chemical reaction: (i) Oxidation reaction (ii) Hydrogenation reaction (iii) Substitution reaction (iv) Esterification reaction (iv) Saponification reaction

Explain the following terms with one example. Rancidity

Explain the following: (i) Smoke (ii) Fumes (iii) Dust (iv) Mist

Explain the following terms : (i) diprotium (ii) dihydrogen (iii) proton (iv) hydron.

Explain or complete the following reactions. (i)