11.

Molar heat of vaporisation of a liquid is 6 kJ mol^-1. If the entropy change is 16 J mol^-1 K^-1, the boiling point of the liquid is:

• 375°C

• 375 K

• 273 K

• 102°C

A buffer solution has equal volumes of 0.2 M NH₄OH and 0.02 M NH₄Cl. The pK_b of the base is 5. The pH is

• 10

• 9

• 4

• 7

A precipitate of AgCl is formed when equal volumes of the following are mixed [K_sp for AgCl = 10^-10]

• 10^-4 M AgNO₃ and 10^-7 M HCl

• 10^-5 M AgNO₃ and 10^-6 M HCl

• 10^-5 M AgNO₃ and 10^-4 M HCl

• 10^-6 M AgNO₃ and 10^-6 M HCl

Which of the following cannot be accelerated?

• α-particle

• β-particle

• protons

• neutrons

In which of the following nuclear reaction neutrons is emitted?

• ${}_{13}{}^{27}\mathrm{Al} + {}_2{}^4\mathrm{He} \to {}_{15}{}^{30}\mathrm{P}$

• ${}_6{}^{12}\mathrm{C} + {}_1{}^1\mathrm{H} \to {}_7{}^{13}\mathrm{N}$

• ${}_{15}{}^{30}\mathrm{P} \to {}_{14}{}^{30}\mathrm{Si}$

• ${}_{96}{}^{241}\mathrm{Am} + {}_2{}^4\mathrm{He} \to {}_{97}{}^{245}\mathrm{Bk}$

Molarity of 0.2 N H₂SO₄ is

• 0.2

• 0.4

• 0.6

• 0.1

In the equation of state of an ideal gas PV = nRT, the value of the universal gas constant would depend only on

• the nature of the gas

• the pressure of the gas

• the units of the measurement

• None of the above

An atom of an element A has three electrons in its outermost orbit and that of B has six electrons in its outermost orbit. The formula of the compound between these two will be

• A₃B₆

• A₂B₃

• A₃B₂

• A₂B

Among Na⁺, Na, Mg and Mg²⁺ the largest particle is

• Mg²⁺

• Mg

• Na

• Na⁺

In blast furnace, iron oxide is reduced by

• hot blast of air

• carbon monoxide

• carbon

• silica