How to find number of stereoisomers in a large compound containing chiral centres ?.

What is denticity of NO and NO+ ligands ?

"NO" is a special ligand which can donate three electrons (3e) to the central metal atom in neutral state but in charge state (NO+) it can donate two electrons only to the central atoms.

What is water in oil emulsions ? explain with examples.

Water in oil emulsions: In this type of emulsions, water acts as dispersed phase and oil (organic solvent) acts as dispersion medium. Cold cream, butter etc, are examples of oil emulsions.