The atomic number of cerium (Ce) is 58. The correct electronic configuration of Ce3+ ion is.
[Xe] 4f1
[Kr] 4f1
[Xe] 4f13
[Kr] 4d1
The number of lone pairs of electrons on the central atoms of H2O, SnCl2, PCl3 an XeF2 respectively are
2, 1, 1, 3
2, 2, 1, 3
3, 1, 1, 2
2, 1, 2, 3
A.
2, 1, 1, 3
The number of lone pairs of electrons on the central atoms of H2O, SnCl2, PCl3 and XeF2 are 2, 1, 1 and 3 respectively.
Number of lone pairs = 2
Number of lone pairs = 1
Number of lone pairs = 1
Number of lone pair = 1
Consider the following salts : NaCl, HgCl2, Hg2Cl2, CuCl2, CuCl and AgCl. Identify the correct set of insoluble salts in water.
Hg2Cl2, CuCl, AgCl
Hg2Cl, 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
Cold ferrous sulphate solution on absorption of NO develops brown colour due to the formation of
paramagnetic [Fe(H2O)5(NO)] SO4
diamagnetic [Fe(H2O)5(N3)] SO4
paramagnetic [Fe(H2O)5(NO3)][SO4]2
diamagnetic [Fe(H2O)4 (SO4)]NO3
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