Which of the following are isoelectronic and isostructural ?

(1) NO2+, CO2                                    

(2) NO3-,BF3

(3) NH3,CH3-                                      

(4) All of these

Subtopic:  Hybridisation |
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The correct order of acidic strength is :

1. Cl2O7>SO2>P4O10                   

2. CO2>N2O5>SO3

3. Na2O>MgO>Al2O3                   

4. K2O>CaO>MgO

Subtopic:  Acidic, Basic Character & Fajan's Rule |
 82%
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In which of the following molecules / ions are all the bond angles not equal?

(1) SiF4                                                   

(2) ICl4- 

(3) SF4                                                    

(4) PCl4+

Subtopic:  Hybridisation |
 65%
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What is the correct order from the weakest to the strongest carbon-oxygen bond for the following species? 

CO, CO2, CO32-, CH3OH

(1) CH3OH <CO32-<CO2<CO                         

(2) CO<CO2 <CO32-<CH3OH

(3) CH3OH <CO32-<CO<CO2                         

(4) CH3OH <CO2<CO32-<CO

Subtopic:  Resonance & Nature of Compounds |
 60%
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According to Molecular orbital theory which of the following statement is incorrect?

(1) LUMO level for C2molecule is σ2px orbital.      

(2) In C2 molecules both the bonds π are bonds.

(3) C2 is paramagnetic but C22-is diamagnetic.     

(4) In C22- ion there is one σ and two π bonds.

Subtopic:  M.O.T |
 68%
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Match the ionization processes listed in column – I with the changes observed as listed in
column-II. For this use the codes given below:

       Column- I                                                                 Column - II

(a) N2 N2+                                 (p) Bond order increases and magnetic property is changed.

(b) O2+O22+                               (q) Bond order decreases and magnetic property is not changed.

(c) B2B2+                                   (r) Bond order increases and magnetic property is not changed.

(d) NO-NO                                  (s) Bond order decreases and magnetic property is changed.

Note : Here change in magnetic property refers to change from diamagnetic to paramagnetic
or paramagnetic to diamagnetic. 

                          a      b          c        d
1.                       s       q          p        r
2.                       s       p          q        r
3.                       r       q          s        p
4.                       p       s         q        r

Subtopic:  M.O.T |
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A diatomic molecule has a dipole moment of 1.2 D. If its bond length is equal to 10 -10 m , then the fraction of an electronic charge on each atom will be:

1. 42%
2. 52%
3. 37%
4. 25%

Subtopic:  Polarity |
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Arrange the following molecules from most to least polar.

CH4              CF2Cl2             CF2H2            CCl4                CCl2H2
I                         II                     III                   IV                        V

(1) III>V>II > IV=I                                 

(2) II>IV>III>IV>I

(3) III>II>V>IV>I                                 

(4) V>III>II>IV=I    

Subtopic:  Polarity |
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Which of the following statements is correct?

(1) CH33 COH is less acidic than CH33 SiOH.

(2) Like CO, its analogue of Si is not stable.

(3) In phosgene, C-O bond length is longer than expected while C-Cl bond length is shorter.

(4) All of these

Subtopic:  Resonance & Nature of Compounds |
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The increasing order of the strength of hydrogen bond in the following mentioned linkages
is

(i) O — H — S     (ii) O — H  — O    (iii) F – H – F   (iv) F – H – O

(1) (i) < (ii) < (iv) < (iii)                                                     

(2) (ii) < (i) < (iv) < (iii)

(3) (i) < (ii) < (iii) < (iv)                                                     

(4) (ii) < (i) < (iii) < (iv)

Subtopic:  van der Waal Force & Hydrogen Bonding |
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