Match the following :

Test/Method	Reagent
(i) Lucas Test	(a) C6H5SO2Cl/ aq. KOH
(ii) Dumas method	(b) HNO3/ AgNO3
(iii) Kjeldahl’s method	(c) CuO/CO2
(iv) Hinsberg test	(d) Conc. HCl and ZnCl2
	(e) H2SO4

The increasing order of the boiling points of the major products A, B and C of the following reactions will be :

For a d⁴ metal ion in an octahedral field, the correct electronic configuration is :

Dihydrogen of high purity (> 99.95%) is obtained through :