At a particular temperature, the ratio of equivalent conductance to specific conductance of a 0.01 N NaCl solution is

• 10⁵ cm³

• 10³ cm³

• 10 cm³

• 10⁵ cm²

The units of surface tension and viscosity of liquids respectively are

• kg m^-1s^-1, Nm^-1

• kg s^-2, kg m^-1s^-1

• Nm^-1, kg m^-1s^-2

• kg s^-1, kg m^-2s^-1

The ratio of volumes of CH₃COOH 0.1 N to CH₃COONa 0.1 N required to prepare a buffer solution of pH 5.74 is (Given, pK_a of CH₃COOH is 4.74)

• 10 : 1

• 5 : 1

• 1 : 5

• 1 : 10

For the reaction, X₂Y₄ (l) → 2XY₂ (g) at 300 K, the values of  and  are 2 kcal and 20 cal K^-1 respectively. The value of $∆\mathrm{G}$ for the reaction is

• -3400 cal

• 3400 cal

• -2800 cal

• 2000 cal

15.

Within the list shown below, the correct pair of structures of alanine in pH ranges 2-4 and 9-11 is

I. H₃N⁺ - CH(CH₃)CO₂H

II. H₂N - CH(CH₃)CO${}_2^{-}$

III. H₃N⁺-CH(CH₃)CO${}_2^{-}$

IV. H₂N-CH(CH₃)CO₂H

• I and II

• I and III

• II and III

• III and IV

Match the flame colours of the alkaline earth metal salts in the Bunsen burner.

A. Calcium	p. Brick red
B. Strontium	q. Apple green
C. Barium	r. Crimson

• A - p; B - r; C - q

• A - r; B - p; C - q

• A - q; B ; r; C - p

• A - p; B - q; C - r

1,4-dimethylbenzene on heating with anhydrous AlCl₃ and HCl produces

• 1, 2-dimethylbenzene

• 1, 3-dimethylbenzene

• 1,2, 3-trimethylbenzene

• ethylbenzene

Best reagent for nuclear iodination of aromatic compounds is

• KI/CH₃COCH₃

• I₂/CH₃CN

• KI/ CH₃COOH

• I₂/ HNO₃

Addition of sodium thiosulphate solution to a solution of silver nitrate gives X as white precipitate, insoluble in water but soluble in excess thiosulphate solution to give Y. On boiling in water, Y gives Z. X, Y and Z respectively are

• Ag₂S₂O₃, Na₃[Ag(S₂O₃)₂], Ag₂S

• Ag₂SO₄, Na[Ag(S₂O₃)₂], Ag₂S₂

• Ag₂S₂O₃, Na₅[Ag(S₂O₃)₃], AgS

• Ag₂SO₃, Na₃[Ag(S₂O₃)₂], Ag₂O

The total number of aromatic species generated in the following reactions is

• zero

• 2

• 3

• 4