The total number of possible resonance forms for the nitrate ion, (NO3-) is: 

1. 1 2. 2
3. 3 4. 4

Subtopic:  Resonance & Nature of Compounds |
 75%
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Which of the following molecule will have all equal XF bond length? (where X= central atom)

(a) SOCl2F2                                                    (b) SeF4(c) PBr2F3                                                          (d) IF7

Subtopic:  Hybridisation |
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Which of the following fact is directly explained by the statement 'oxygen is a smaller atom than sulpher'?

(1) H2O boils at a much higher tempreture than H2S

(2) H2S undergoes intermolecure hydrogen bonding

(3) H2O is liquid and H2S is gas at room tempreture 

(4) SH bond is longer than OH bond

Subtopic:  Hybridisation |
 53%
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Among given species identify the isostructural pairs:

(1) NF3  and BF3

(2) BF4- and NH4+

(3) BCl3 and BrCl3

(4) NH3 and NO3-

Subtopic:  Covalent Bond |
 83%
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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 :

(1)g>a>d>b                                             

(2) g>e>f>b

(3) f>d>a>b                                             

(4) c>f>d>b

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

(1) CH3CF3                               (2) FCH2CH2F

(3) F2CH-F2CH                            (4) CF3CF3

Subtopic:  Types of Chemical Bond | V.S.E.P.R & V.B.T |
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The ratio of σ / π bond  in tetracyano ethylene is: 

(1) 2:1

(2) 1:1

(3) 1:2 

(4) none of these 

Subtopic:  Types of Chemical Bond |
 71%
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Which of the following statement is correct in the context of the allene molecules, C3H4?

1. The central carbon is Sp hybridized

2. The terminal carbon atoms are sp2 hybridized

3. The planes containing the CH2 groups are  mutually perpendicular to permit the formations of two separate π - bonds 

4. All are correct 

Subtopic:  Hybridisation |
 78%
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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)

Subtopic:  Covalent Bond |
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The shape of XeF3+ is:

1. Trigonal planar 2. Pyramidal
3. Bent T-shape  4. See-saw
Subtopic:  V.S.E.P.R & V.B.T |
 70%
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