Explain the formation of a mirage.

Explain the formation of a chemical bond.

Explain the formation of ATP.

Explain the formation of acid rain due to : oxides of sulphur

Explain the formation of acid rain due to : oxides of nitrogen

Explain the formation of chemical bond.

Explain the formation of CaF_2 molecule.

Explain the formation of carbon-carbon double bond in ethene.

Explain the formation of Fraunhofer lines using Kirchhoff's law .

Describe the salient features of valence bond theory. Explain the formation of H2 molecule on the basis of this theory.

(a) Explain the formation of standing waves in an organ pipe closed at one end and discuss the various modes of vibration.