Which molecule does not exist?

1. OF2

2. OF4

3. SF2

4. SF4

Subtopic:  Covalent Bond |
 79%
From NCERT
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The species having no pπ-pπ bond but has a bond order equal to that of O2

(a) CIO-3     

(b) PO43-   

(c)SO42-   

(d) XeO3

Subtopic:  M.O.T |
 57%
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Which pair of atom form strongest ionic bond?

(1) Al and As

(2) Al and N

(3) Al and Se

(4) AL and O

Subtopic:  Ionic Bond |
 57%
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The correct order of increasing s-character (in percentage) in the hybrid orbitals of the following molecules/ions is:

(i) \(\mathrm{CO}^{2-}_3\)
(ii) \(\mathrm{XeF}_4\)
(iii) \(\mathrm{I}^-_3\)
(iv) \(\mathrm{NCl}_3\)
(v) \(\mathrm{BeCl}_2\)
 
1. (ii)<(iii)<(iv)<(i)<(v) 2. (ii)<(iv)<(iii)<(v)<(i)
3. (iii)<(ii)<(i)<(v)<(iv) 4. (ii)<(iv)<(iii)<(i)<(v)


Subtopic:  Hybridisation |
 70%
From NCERT
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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%
From NCERT
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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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