At 27°C latent heat of fusion of a compound is 2930 J/ mol, then entropy change is

• 9.77 J/mol-K

• 10.77 J/ mol-K

• 9.07 J/ mol-K

• 0.977 J/ mol-K

For the reaction,

C₂H₅OH (l) + 3O₂ (g) → 2CO₂ (g) + 3H₂O (l)

which one is true?

• $∆\mathrm{H} = ∆\mathrm{E} - \mathrm{RT}$

• $∆\mathrm{H} = ∆\mathrm{E} + \mathrm{RT}$

• $∆\mathrm{H} = ∆\mathrm{E} + 2\mathrm{RT}$

• $∆\mathrm{H} = ∆\mathrm{E} - 2\mathrm{RT}$

1.1 moles of A and 2.2 moles of B are mixed in a container of one litre volume to obtain the equilibrium A + 2B $\rightleftharpoons$ 2C + D.

At equilibrium 0.2 moles of C are formed. The equilibrium constant for the above reaction is

• 0.001

• 0.002

• 0.003

• 0.004

In which solution/ solvent the solubility of AgCl is minimum?

• 0.01 M NaCl

• 0.01 M CaCl₂

• Pure water

• 0.001 M AgNO₃

Which one of the following salts gives an acidic solution in water?

• CH₃COONa

• NH₄Cl

• NaCl

• CH₃COONH₄

Which of the following exhibits highest solubility in water?

• NH₃

• PH₃

• AsH₃

• SbH₃

17.

The ionic radii of N^3-, O^2-, F^- and Na⁺ follow the order

• N^3- > O^2- > F^- > Na⁺

• N^3- > Na⁺ > O^2- > F^-

• Na⁺ > O^2- > N^3- > F^-

• O^2- > F^- > Na⁺ > N^3-

The vapour pressure decreases by 10 mm of Hg when mole fraction of solute in a solution is 0.2. If the vapour pressure decreases to 20 mm of Hg then the mole fraction of solute will be

• 0.2

• 0.4

• 0.6

• 0.8

What is the entropy change (in JK^-1 mol^-1) when one mole of ice is converted into water at 0°C? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol^-1 at 0°C).

• 20.13

• 2.013

• 2.198

• 21.98

The molar heat capacity (C) of water at constant pressure, is 75 JK^-1 mol^-1. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is

• 1.2 K

• 2.4 K

• 4.8 K

• 6.6 K