CBSE Class 12 Chemistry 2015 Solved Paper

Question : 19

Total: 26

(a) How would you account for the following:
(i) Actinoid contraction is greater than lanthanoid contraction.
(ii) Transition metals form coloured compounds.
(b) Complete the following equation:
2MnO4−+6H++5NO2− ────▸

Solution:

(a) (i) 5f orbital electrons have poor shielding effect than 4f orbital electrons.
(ii) Due to d - d transition or the energy of excitation of an electron from lower d orbital to higher d-orbital lies in the visible region and presence of unpaired electrons in the d-orbital.
(b) 2MnO4−+6H++5NO2− ────▸2Mn2+ +3H2O+5NO3−

Go to Question:

Prev Question

Next Question