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
At a certain temperature, the value of the slope of the plot of osmotic pressure () 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 = Tc and p < pc
T < Tc and p > pc
T > Tc and p > pc
T > Tc and p < pc
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
A.
B
Among all the given options, B or BOron has the second highest ionisation potential. The electronic configuration of boron is 2s22p1. And electronic configuration of B+ is 2s2. Hence, it is difficult to remove second electron from 2s2 shell because half- filled and fully filled orbitals are more stable than others.
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