Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is

• 2.28 mol kg^-1

• 3.28 mol kg^-1

• 0.44 mol kg^-1

• 1.14 mol kg^-1

The pK_a value of (I) 2 - bromo propanoic acid, (II) 2-fluoro propanoic acid, (III) 3 - fluoro propanoic acid, (IV) 3- bromo propanoic acid decreases as

• I > III > IV > II

• II > IV > III > I

• I > IV > III > II

• IV > I > III > II

The correct order of electron affinity of oxygen, sulphur, chlorine, fluorine is

• S < O < Cl < F

• S < O < F < Cl

• O < S < F < Cl

• O < S < Cl < F

The metal which deposits copper from copper sulphate solution is

• gold

• iron

• platinum

• mercury

Which is the strongest Lewis base ?

• SbH₃

• AsH₃

• PH₃

• NH₃

16.

Favourable conditions for the formation of electrovalent bond is that the cation and anion must have, respectively

• high ionisation potential and low electron affinity

• low ionisation potential and high electron affinity

• high ionisation potential and high electron affinity

• low ionisation potential and low electron affinity

Consider the following reaction,

(CH₃)₃CCl + OH^- → (CH₃)₃C-OH + Cl^-

If OH^- does not take part in slow step, the molecularity and order of the reaction are respectively,

• 2, 2

• 2, 1

• 1, 2

• 1, 1

Given, H₂O (l) → H₂O (g); $∆$H₁ = +43 kJ

H₂O (s) → H₂O (l); $∆$H₂ = +6.05 kJ. Calculate the enthalpy of sublimation of ice.

• 49.75 kJ mol^-1

• 37.65 kJ mol^-1

• 43.7 kJ mol^-1

• 55.23 kJ mol^-1

Which of the following pairs will show common ion effect?

• Barium chloride + Barium sulphate

• Silver cyanide + Potassium nitrite

• Ammonium hydroxide + Ammonium chloride

• Sodium chloride + Hydrogen chloride

On Pauling scale, the electronegativity of an element is measured by using

• ${\mathrm{\chi }}_{\mathrm{A}} - {\mathrm{\chi }}_{\mathrm{B}} = \sqrt{∆}$

• ${\mathrm{\chi }}_{\mathrm{A}} - {\mathrm{\chi }}_{\mathrm{B}} = 0.208 \sqrt{∆}$

• ${\mathrm{\chi }}_{\mathrm{A}} + {\mathrm{\chi }}_{\mathrm{B}} = 0.208 \sqrt{∆}$

• ${\mathrm{\chi }}_{\mathrm{A}} - {\mathrm{\chi }}_{\mathrm{B}} = 0.208 {∆}^2$