The coordination geometry around and hybridization of N and B atoms in a 1:1 complex of NH3 and BF3 is:

(1) N: tetrahedral, sp3;  B: tetrahedral, sp3

(2) N: pyramidal, sp3; B: pyramidal, sp3

(3) N: pyramidal, sp3; B: planar, sp2

(4) N: pyramidal, sp3; B: tetrahedral, sp3

Subtopic:  Hybridisation |
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Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is :

(1) Be2

(2) B2

(3) C2

(4) N2

Subtopic:  M.O.T |
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When O2 is adsorbed on a metallic surface, electron transfer occurs from the ,metal to O2. The wrong statements(s) regarding this adsorption is (are): 

(1) O2 is physisorbed 

(2) Heat is released

(3) Occupancy of π*2p of O2 is increased 

(4) Bond length of O2 is increased

Subtopic:  Covalent Bond |
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Born Haber cycle is used to determine:

(1) lattice energy 

(2) electron affinity 

(3) ionization energy 

(4) either of them 

Subtopic:  Covalent Bond |
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The molecule having the smallest bond angle is-

1. PCl3 2. NCl3
3. AsCl3 4. SbCl3
Subtopic:  V.S.E.P.R & V.B.T |
 63%
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Select the most ionic and most covalent compounds respectively from the following.

CrO5,Mn2O7,PbO, P4O10, SnO2

(A) CrO5, Mn2O7                                (B)  PbO, Mn2O7

(C) CrO5, P4O10                                 (D) SnO2, CrO5

Subtopic:  Acidic, Basic Character & Fajan's Rule |
 55%
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In which of the following sets the central atom of each member involves sp3 hybridisation?

(A) IO4ICl4and IF4+                                      (B) XeO3, XeO4, XeF4

(C) SO3,SO32, SO42                                    (D) PCl4+, BF4, ClO4

Subtopic:  Hybridisation |
 79%
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In which of the following groups all the members have linear shape?

(1) NO2, N3, ICl2+                          

(2) N3, I3, NO2+

(3) XeF2, C2H2, SO2                        

(4) CO2, BeCl2, SnCl2

Subtopic:  Hybridisation |
 58%
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Which reaction involves a change in the HYBRIDIZATION for the under lined geometry?

(A) BF3+ F BF4-                           (B) NH3 +  H+ NH4+

(C) 2SO2+O22SO3                        (D) H2O + H+ H3O+

Subtopic:  Hybridisation |
 70%
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The BF3 is a planar molecule whereas NF3 is pyramidal because:

1. B-F bond is more polar than N-F bond.

2. Boron atom is bigger than nitrogen atom.

3. Nitrogen is more electronegative than boron.

4. BF3 has no lone pair but NF3 has a lone pair of electrons.

Subtopic:  Hybridisation | V.S.E.P.R & V.B.T |
 90%
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