11.

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 $∆\mathrm{U}$ and $∆\mathrm{S}$ 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

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 - 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