Heating chloroform with aqueous sodium hydroxide solution forms-

• sodium acetate

• sodium oxalate

• sodium formate

• chloral

At T (K), the ratio of kinetic energies of 4g of H₂ (g) and 8 g of O₂ (g) is

• 1 : 4

• 4 : 1

• 2 : 1

• 8 : 1

Which one of the followng is an isotonic pair of solutions?

• 0.15 M NaCl and 0.11 M Na₂SO₄

• 0.2 M Urea and 0.1 M Sugar

• 0.1 M BaCl₂ and 0.2 M Urea

• 0.4 M MgSO₄ and 0.1 M NH₄Cl

The vapour pressure in mm of Hg, of an aqueous solution obtained by adding 18 g of glucose (C₆H₁₂O₆) to 180g of water at 100°C is

• 76.0

• 7.60

• 759

• 752.4

During the electrolysis of copper sulphate aqueous solution using copper electrode, the reaction taking place at the cathode is

• Cu → Cu²⁺ (aq) + 2e^-

• Cu²⁺ (aq) + 2e^- → Cu (s)

• H⁺ (aq) + e^- → $\frac{1}{2}$ H₂ (g)

• SO${}_4^{2-}$ (aq) → SO₃ (g) + $\frac{1}{2}$O₂ (g) + 2e^-

The extent of charge of lead accumulator is determined by

• amount of PbSO₄ in the battery

• amount of PbO₂ in the battery

• specific gravity of H₂SO₄ of the battery

• amount of Pb in the battery

27.

The number of octahedral and tetrahedral holes respectively present in a hexagonal close packed (hcp) crystal of 'X' atoms are

• X, 2X

• X, X

• 2X, X

• 2X, 2X

Which one of the following plots is correct for a first order reaction?

Match the following:

List - I	List - II
A. Solid dispersed in liquid	i. Emulsion
B. Liquid dispersed in liquid	ii. Foam
C. Gas dispersed in liquid	iii. Gel
D. Liquid dispersed in solid	iv. Sol v. Aerosol

The correct match is

• A - iv; B - i; C - ii; D - iii

• A - iii; B - i; C - v; D - ii

• A - iii; B - i; C - ii; D - iv

• A - iv; B - i; C - v; D - iii

Which one of the following is not correct?

• Pyrophosphoric acid is a tetrabasic acid.

• Pyrophosphoric acid contains P-O-P linkage. Pyrophosphoric acrd contains two P-H bonds.

• Pyrophosphoric acid contains two P-H bonds.

• Orthophosphoric acd can be prepared by dissolvng P₄O₁₀ in water.