The number of lone pairs of electrons on the central atoms of H₂O, SnCl₂, PCl₃ and XeF₂ respectively are

• 2, 1, 1, 3

• 2, 2, 1, 3

• 3, 1, 1, 2

• 2, 1, 2, 3

Consider the following salts : NaCl, HgCl₂, Hg₂Cl₂, CuCl₂, CuCl and AgCl.

Identify the correct set of insoluble salts in water.

• Hg₂Cl₂, CuCl, AgCl

• HgCl₂, CuCl_, AgCl

• Hg₂Cl₂, CuCl₂, AgCl

• Hg₂Cl₂, CuCl, NaCl

In the following compound, the number of sp-hybridised carbons are

CH₂=C=CH-CH(CN)-C≡CH

• 2

• 3

• 4

• 5

At a certain temperature, the value of the slope of the plot of osmotic pressure ($\mathrm{\pi }$) against concentration (C in molL^-1) of a certain polymer solution is 291R. The temperature at which osmotic pressure is measured, is (R is gas constant)

• 271°C

• 18°C

• 564 K

• 18 K

The RMS velocity of CO gas molecules at 27°C is approximately 1000 m/s. For N₂ molecules at 600 K, the RMS velocity is approximately

• 2000 m/s

• 1414 m/s

• 1000 m/s

• 1500 m/s

A gas can be liquefied at temperature T and pressure p provided.

• T = T_c and p < p_c

• T < T_c and p > p_c

• T > T_c and p > p_c

• T > T_c and p < p_c

The dispersed phase and dispersion medium of fog respectively are

• solid, liquid

• liquid, liquid

• liquid, gas

• gas, liquid

The decreasing order of basic character of K₂O, BaO, CaO and MgO is

• K₂O > BaO > CaO > MgO

• K₂O > CaO > BaO > MgO

• MgO > BaO > CaO > K₂O

• MgO > CaO > BaO > K₂O

Among Be, B, Mg and Al, the second ionisation potential is maximum for

• B

• Be

• Mg

• Al

For the reaction,
2SO₂ (g) + O₂ (g) → 2SO₃ (g) at 300 K, the value of $∆$G° is -690.9 R. The equilibrium constant value for the reaction at that temperature is (R is gas constant)

• 10 atm^-1

• 10 atm

• 10

• 1