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

(a) Be2

(b) B2

(c) C2

(d) N2

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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): 

(a) O2 is physisorbed 

(b) Heat is released

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

(d) Bond length of O2 is increased

Concept Questions :-

Covalent Bonding
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Born Haber cycle is used to determine:

(a) lattice energy 

(b) electron affinity 

(c) ionization energy 

(d) either of them 

Concept Questions :-

Covalent Bonding
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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

Concept Questions :-

Acid, Base and Fajan's Rule
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The hybridization of atomic orbitals of nitrogen in NO2+, NO3- and NH4+ are :

(A) sp, sp3and sp2 respectively                                  (B) sp, sp2and sp3 respectively

(C) sp2, sp and sp3 respectively                                 (D) sp2, sp3 and sp respectively

Concept Questions :-

Hybridisation
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In which of the following sets the central atom of each member involves sp3 hybridisation?

(A) IO4ICl4and IF4+                                      (B) X3O3, XeO4,X3F4

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

Concept Questions :-

Hybridisation
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In which of the following groups all the members have linear shade?

(A) NO2, N3, ICl2+                           (B) N3, I3, NO2+

(C) XeF2, C2H2, SO2                         (D) CO2, BeCl2, SnCl2

Concept Questions :-

Hybridisation
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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+

Concept Questions :-

Hybridisation
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The BF3 is a planarn molecule where as NF3 is pyramidal because:

(A) B-F bond is more polar than N-F bond.

(B) Boron atom is bigger than nitrogen atom.

(C) Nitrogen is more electronegative than boron.

(D) BF3 has no lone pair but NF3 has a lone pair of electrons.

Concept Questions :-

Hybridisation
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Which of the following statement is true for IO2F2-according to VSEPR theory?

(A) The lone pair and two I-O double bonds occupy the equatorial positions of trigonal
bipyramid.

(B) It has sp3 hybridization and is T-shaped.

(C)  Its structure is analogous to SF4.

(D) (A) and (C) both

Concept Questions :-

Hybridisation
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