The entropy change in the fusion of one mole of a solid melting at 27ºC (Latent heat of fusion, 2930 J mol^-1) is :

Which one of the following pairs of species have the same bond order?

Arrange the following ions in the order of decreasing X – O bond length, where X is the central atom in

In pyrophosphoric acid, H₂P₂O₇, number of ? and d? – p? bonds are respectively

The calculated bond order in \(O_{2}^{-}\) ion is

How many ? and ? bonds are present in toluene?

Which of the following has p? – d? bonding ?