The set that represents the pair of neutral oxides of nitrogen is :

During which of the following processes, does entropy decrease?

(A) Freezing of water to ice at 0$$^\circ$$C

(B) Freezing of water to ice at $$-$$10$$^\circ$$C

(C) N₂(g) + 3H₂(g) $$ \to $$ 2NH₃(g)

(D) Adsorption of CO(g) on lead surface.

(E) Dissolution of NaCl in water

Choose the correct answer from the options given below :

For the coagulation of a negative sol, the species below, that has the highest flocculating power is :

In the above reaction, the structural formula of (A), ''X'' and ''Y'' respectively are :