Among given species identify the isostructural pairs:

(a) NF3  and BF3

(b) BF4- and NH4+

(c) BCl3 and BrCl3

(d) NH3 and NO3-

Concept Questions :-

Covalent Bonding
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Consider the following information (X=F or Cl)

Molecule     P-X(axial)       P-X(Equitorial) 

                 bond length     bond length

PF5                     a                        b

PF4CH3            c                        d

PF3(CH3)2       e                       f

PCl5                   g                      h

According to information choose the incorrect order of bond length :

(a)g>a>d>b                                             

(b) g>e>f>b

(c) f>d>a>b                                             

(d) c>f>d>b

Concept Questions :-

Hybridisation
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In which of the following cases CC bond length will be highest?

(a) CH3CF3                               (b) FCH2CH2F

(c) F2CH                                       (d) CF3CF3

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The ratio of σ / π bond  in tetracyano ethylene is: 

(a) 2:1

(b) 1:1

(c) 1:2 

(d) none of these 

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Which of the following statement is correct in the context of the allene molecules, C3H4?

(a) The central carbon is Sp hybridized

(b) The terminal carbon atoms are sp2 hybridized

(c) The planes containing the CH2 groups are  mutually perpendicular to permit the formations two separate π - bonds 

(d) All are correct 

Concept Questions :-

Hybridisation
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Select the incorrect statement about N2F4 and N2H4:

(i) In N2F4, d-orbitals are contracted by electronegative fluorine atoms, but d-orbitals contaraction is not possible by H-atom in N2H4

(ii) The N-N bond energy in N2F4 is lesser than N-N bond energy in N2H4

(iii) The N-N bond length in N2F4 is more than that in N2H4

(iv) The N-N bond length in N2F4 is less than that in N2H4

Choose the correct code:

(a) (i),(ii) and (iii)                                        (b) (i) and (iii)

(c) (ii) and (iv)                                            (d) (ii) and (iii)

Concept Questions :-

Covalent Bonding
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The shape of XeF3+ is :

(a) Trigonal planar

(b) Pyramidal

(c) Bent T-shape 

(d) See- saw

Concept Questions :-

Hybridisation
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Which of the following shape are not possible for possible value of 'n' in XeFn molecule?

(a) Linear 

(b) Square planar 

(c) Trigonal planar

(d) Capped octahedral

Concept Questions :-

Hybridisation
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Which of the following compound has maximum "CC" single bond length?

(a)CH2CHCCH       (b)HCCCCH 

(c) CH3CHCH2        (d)CH2CHCHCH2

Concept Questions :-

Types of Bonding
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BeCl2 is not isostructural with :

(a)ICl2-

(b) C2H2

(c) XeF2

(d) GeCl2

Concept Questions :-

Hybridisation
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