Which of the following is the least volatile?
     

1. HCN                     
2. HF        
3. H2O                     
4. CS2

Subtopic:  van der Waal Force & Hydrogen Bonding |
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A : Tetracyanomethane

B : Carbondioxide

C : Benzene

D : 1,3-Buta-di-ene

Ratio of σ and π bonds is in order :       

1. A = B < C < D           

2. A = B < D < C           

3. A = B = C = D           

4.  C < D < A < B

Subtopic:  Covalent Bond |
 64%
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The maximum number of 90° angles between bond pair-bond pair of electrons is observed in:

1.  sp3d2-hybridization.            

2.  sp3d-hybridization.

3.  dsp2-hybridization.             

4.  dsp3-hybridization.

Subtopic:  Hybridisation |
 73%
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The ion that has a trigonal planar shape is: 

1. SO32-

2. PO43-

3. CN-

4. CO32-

Subtopic:  Hybridisation | V.S.E.P.R & V.B.T |
 75%
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Which of the following molecules or ions is not linear ?               

1. BeCl2                 

2. ICl2-        

3. CS2                     

4. ICl2+

Subtopic:  V.S.E.P.R & V.B.T |
 60%
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Which reaction involves a change in the electron-pair geometry for the underlined atom?

1. BF3 +F-BF4- 

2. NH3+H+NH4+

3. 2SO2+O22SO3 

4. H2O+H+H3O+   

Subtopic:  V.S.E.P.R & V.B.T |
 73%
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The correct order of increasing s-character (in percentage) in the hybrid orbitals of following molecules/ion is :

(i) CO32-   (ii) XeF4     (iii) I3-       (iv) NCl3   (v) BeCl2

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%
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Which of the following condition show linear geometry (b.p. = Bond pair, I.p. = Lone pair) :

(a)  Molecule in which central atom show sp3d hybridisation and contain 3 b.p. and 2 l.p.

(b)  Any diatomic molecule

(c)  Tri-atomic molecule in which central atom has 2 l.p and 2σ b.p.

(d)  Molecule in which central atom has 2σ b.p. and 2π b.p. and contain no. l.p.

1. a, b                       2. b, d

3. a, c, d                   4. a, b, c, d

Subtopic:  V.S.E.P.R & V.B.T |
 69%
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Which is non-angular species :

1. I3+                2. ClO2-    

3. SO2              4. I3-  

Subtopic:  V.S.E.P.R & V.B.T |
 63%
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Match the column :

 

I

 

II

(P)

BH4-

(I)

Linear; 2 bond pair and 3 lone pair

(Q)

ICl2+

(II)

Tetrahedral, 4 bond pair and no lone pair

(R)

ICl2-

(III)

Tetrahedral; 3 bond pair and 1 lone pair

(S)

ICl4-

(IV)

V shaped; 2 bond pair and 2 lone pair

 

 

(V)

Square planar; 4 bond pair and 2 lone pair

 

 

(VI)

Square planar; 4 bond pair and no lone pair

1. P = II, Q = IV, R = III, S = VI

2.  P = II, Q = IV, R = I, S = V

3.  P = II, Q = I, R = V, S = VI  

4.  P = II, Q = I, R = III, S = IV

Subtopic:  Hybridisation | V.S.E.P.R & V.B.T |
 82%
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