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 value of K_C is 64 at 800 K for the reaction

N₂(g) + 3H₂(g) ⇌ 2NH₃(g)

The value of K_C for the following reaction is :

NH₃(g) ⇌ $${1 \over 2}$$N₂(g) + $${3 \over 2}$$H₂(g)

A set of solutions is prepared using 180 g of water as a solvent and 10 g of different nonvolatile solutes A, B and C. The relative lowering of vapour pressure in the presence of these solutes are in the order :

[Given, molar mass of A = 100 g mol^–1; B = 200 g mol^–1; C = 10,000 g mol^–1]

For the given cell :

Cu(s) | Cu²⁺(C₁M) || Cu²⁺(C₂M) | Cu(s)

change in Gibbs energy ($$\Delta $$G) is negative, if :