What is the structure of XeF₆?

• Tetrahedral

• Distorted octahedral

• Octahedral

• None of these

Lowering of vapour pressure is highest for

• 0.1 M BaCl₂

• 0.1 M glucose

• 0.1 M MgSO₄

• Urea

3.

The set representing the correct order of ionic radius is

• Li⁺ > Be²⁺ > Na⁺ > Mg²⁺

• Na⁺ > Li⁺ > Mg²⁺ > Be²⁺

• Li⁺ > Na⁺ > Mg²⁺ > Be²⁺

• Mg²⁺ > Be²⁺ > Li⁺ > Na⁺

NaOH is a strong base. What will the be pH of 5.0 × 10^-2 M NaOH solution? (log 2 = 0.3)

• 14.00

• 13.70

• 13.00

• 12.70

The enthalpy of combustion for the H₂, cyclohexene and cyclohexane are -241, -3800 and -3920 kJ mol^-1 respectively. Heat of hydrogenation of cyclohexene is

• 121 kJ mol^-1

• -121 kJ mol^-1

• 242 kJ mol^-1

• -242 kJ mol^-1

The value of K_c for the dissociation reaction, H₂ (g) $\rightleftharpoons$ 2H (g) is 1.2 × 10^-42

This equilibrium mixture contains mainly

• H₂ (g)

• H (g) atom

• 1.1 M mixture of H₂ and H

• 1.2 M mixture of H₂ and H

K_sp of CaSO₄ is 4 × 10^-12. CaSO₄ is precipitated on mixing equal volumes of the following solutions.

• 3 × 10^-10 M CaCl₂ and 3 × 10^-6 M (NH₄)₂SO₄

• 4 × 10^-6 M CaCl₂ and 3 × 10^-6 M (NH₄)₂SO₄

• 6 × 10^-6 M CaCl₂ and 3 × 10^-16 M (NH₄)₂SO₄

• In all the above cases

Which of the following is the correct decreasing order of oxidation state of nitrogen?

• HNO₃ > NO > NH₄Cl > N₂

• HNO₃ > NO > N₂ > NH₄Cl

• HNO₃ > NH₄Cl > NO > N₂

• NO > HNO₃ > NH₄Cl > N₂

Which of the following has highest electron affinity?

• N

• O

• F

• Cl

The shape of XeO₂F₂ molecule is

• trigonal bipyramidal

• square planar

• tetrahedral

• see-saw