Long Answer TypeExplain coordinate bond by the orbital concept.
A coordinate bond is formed by the overlapping of an orbital of an atom containing a lone pair of electrons with the empty orbital of the other atom.
Let us consider the formation of ammonium ion (N+H4). It is formed by the combination of ammonia molecule and hydrogen ion.
The central nitrogen atom of ammonia molecule has one orbital containing a lone pair of electrons while the other three orbitals are filled up with bond pairs of electrons.
On the other hand, hydrogen ion has empty is orbital. When the H+ ion approaches ammonia molecule, its empty orbital overlaps the orbital of nitrogen atom containing a lone pair to form a dative bond. 
Short Answer TypeLong Answer TypeName the theory responsible for the definite geometry of covalent molecules. Give main features of the theory ?
Short Answer TypeHow will you explain the following order of the repulsive interactions between pair of electrons on the central atom:
Lone pair - Lone pair > Lone pair - Bond pair > Bond pair - Bond pair.
Long Answer TypeOn the basis of VSEPR theory, discuss the geometry of the following covalent molecules: (i) BeF2 (ii) BF3 (iii) CH4.
Short Answer TypeAlthough geometries of NH3 and H2O molecules are distorted tetrahedral, the bond angle in water is less than that of ammonia. Discuss.
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