11.

Two liquids X and Y form an ideal solution. The mixture has a vapour pressure of 400 mm at 300 K when mixed in the molar ratio of 1 : 1 and a vapour pressure of 350 mm when mixed in the molar ratio of 1 : 2 at the same temperature. The vapour pressures of the two pure liquids X and Y respectively are

• 550 mm, 250 mm

• 350 mm, 450 mm

• 350 mm, 700 mm

• 500 mm, 500 mm

In which of the following the oxidation number of oxygen has been arranged in increasing order?

• OF₂ < KO₂ < BaO₂ < O₃

• BaO₂ < KO₂  < O₃ < OF₂ 

• BaO₂  < O₃ < OF₂  < KO₂ 

•  KO₂  < OF₂  < O₃ < BaO₂ 

The pH of a solution obtained by mixing 50 mL of 1 N HCl and 30 mL of 1 N NaOH is [log 2.5 = 0.3979]

• 12.042

• 0.6021

• 0.3979

• 3.979

0.1 mole of a carbohydrate with empirical formula CH₂O contains 1 g of hydrogen. What is its molecular formula?

• C₂H₄O₂

• C₅H₁₀O₅

• C₃H₆O₃

• C₆H₁₂O₆

MnO^-₄  ions are reduced in acidic condition to Mn²⁺ ions whereas they are reduced in neutral condition to MnO₂. The oxidation of 25 mL of a solution X containing Fe²⁺ ions required in acidic condition 20 mL of a solution Y containing MnO^-₄ ions. What volume of solution Y would be required to oxidise 25 mL of a solution X containing Fe²⁺ ions in neutral condition? 

• 11.4 mL

• 12.0 mL

• 33.3 mL

• 35.0 mL

Which pair of the following chlorides do not impart colour to the flame?

• BeCl₂ and SrCl₂

• BeCl₂ and MgCl₂

• CaCl₂ and BaCl₂

• BaCl₂ and SrCl₂

Sodium peroxide which is a yellow solid, when exposed to air becomes white due to the formation of

• H₂O₂

• NaOH and Na₂CO₃

• Na₂O

• NaOH and H₂O₂

Which one of the following reactions involves disproportionation?

• 2H₂SO₄ + Cu → CuSO₄ + 2H₂O + SO₂

• As₂O₃ + 3H₂S → As₂S₃ + 3H₂O

• 2KOH + Cl₂ → KCl KOCl + H₂O

• 4NH₃ + 3O₂ → 2N₂ + 6H₂O

Which of the following process is suitable for the purification of aniline?

• Simple distillation

• Fractional distillation

• Fractional crystallisation

• Steam distillation

Of the isomeric hexanes, the isomers that give the minimum and maximum number of monochloro derivatives are respectively

• 3-methylpentane and 2,3-dimethylbutane

• 2,3-dimethylbutane and n-hexane

• 2,2-dimethylbutane and 2-methylpentane

• 2,3-dimethylbutane and 2-methylpentane