Multiple Choice QuestionsIn which of the following pairs of molecules/ions, the central atoms have sp2 hybridization?
NO2- and NH3
BF3 and NO2-
NH2- and H2O
NH2- and H2O
B.
BF3 and NO2-
(i) NO2- ⇒ 2σ + 1 lp =3, ie, sp2 hybridisation
(ii) NH3 ⇒ 3σ + 1 lp = 4, ie, sp3 hybridisation
(iii) BF3 ⇒ 3σ + 0 lp = 3, i.e sp2 hybridisation
(iv) NH2- ⇒ 2σ + 2 lp = 4 i.e sp3 hybridisation
(v) H2O ⇒ 2σ + 2 lp = 4 i.e sp3 hybridisation
Thus, among the given pairs, only BF3 and NO2- have sp2 hybridizations.
If pH ofa saturated solution of Ba(OH)2 is 12, the value of its Ksp is
4.00 x 10-6 M3
4.00 x 10-7 M3
5.00 x 10-6 M3
5.00 x 10-6 M3
Which one of the following species does not exist under normal conditions?
Be2+
Be2
B2
B2
The number of atoms in 0.1 moles of a triatomic gas is (NA = 6.02 x 1023 mol-1)
6.026 x 1022
1.806 x 1023
3.600 x 1023
3.600 x 1023
Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl?
Cl < F < O < S
O < S < F< Cl
F < S < O < Cl
F < S < O < Cl
Standard entropies X2, Y2 and XY2 are 60, 40 and 50 J K-1 mol-1 respectively for the reaction
equilibrium, the temperature should be
750 K
1000 K
1250 K
1250 K
In which one of the following species the central atom has the type of hybridisation which si not the same as that present in the other three?
SF4
I3-
SbCl52-
SbCl52-
The correct order of the decreasing ionic radii among the following isoelectronic species is
Ca2+ > K+ >S2- > Cl-
Cl- > S2- > Ca2+ > K+
S2- > Cl- > K+ > Ca2+
S2- > Cl- > K+ > Ca2+
Which of the following pairs has the same size?
Fe2+ , Ni2+
Zr4+, Ti4+
Zr4+, Hf4+
Zr4+, Hf4+
What is [H+] in mol/L of a solution that is 0.20 M in CH3COONa and 0.10 M in CH3COOH?
(Ka for CH3COOH = 1.8 x 10-5 )
3.5 x 10-4
1.1 x 10-5
1.8 x 10-5
1.8 x 10-5
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