11.

Two liquids A and B form type II non-ideal solution which shows a minimum in its temperature -mole fraction plot (T-X diagram). Can the two liquids be completely separated by fractional distillation?

Answer the following questions:
The aqueous solution of sodium acetate is basic. Explain.

A solution containing 0·5 g of KCl dissolves in 100 g of water and freezes at – 0·24^oC. Calculate the degree of dissociation of the salt. (K_f for water = 1.86^oC) Atomic weights [K = 39, Cl = 35·5]

If 1·71 g of sugar (molar mass = 342) are dissolved in 500 ml of an aqueous solution at 300 K, what will be its osmotic pressure?

0·70g of an organic compound, when dissolved in 32g of acetone, produces an elevation of 0·25^oC in the boiling point. Calculate the molecular mass of the organic compound (Kb for acetone = 1·72 K kg mol^-1).

(i) What is the difference between order of a reaction and the molecularity of a
reaction?

(ii) A substance decomposes by following first order kinetics. If 50% of the compound
is decomposed in 120 minutes, how long will it take for 90% of the compound to
decompose?

Name the crystal structure of the copper metal

Chromium metal crystallises with a body centered cubic lattice. The edge length of the unit cell is found to be 287 pm. Calculate the atomic radius. What would be the density of chromium in g / cm3? (atomic mass of Cr = 52·99)

Why does sodium chloride on heating with sodium vapours acquire yellow colour?

The equilibrium constant for the reaction:
N₂(g) + 3H₂(g) ⇌ 2NH₃(g) at 715 K, is 6·0 × 10^-2.

If, in a particular reaction, there are 0·25 mol L-1 of H2 and 0·06 mol L-1 of NH₃ present, calculate the concentration of N2 at equilibrium.