The compound that has the highest ionic character associated with the X-Cl bond is:

1. PCl5 

2. BCl3

3. CCl4

4. SiCl4

Subtopic:  Polarity |
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In which of the folllowing transformations, the bond order has increased and the magnetic behaviour has changed?

(a) C2+C2                      (b) NO+NO

(c) O2O2+                       (d) N2N2+

Subtopic:  M.O.T |
 56%
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The bond having the highest bond energy is :

(1) C=C 

(2) C=S

(3) C=O

(4) P=N

Subtopic:  Covalent Bond |
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H.O.M.O. (Highest Occupied Molecular Orbital) of CO molecular is :

(1) Non-bonding M.O. with slight antibonding character

(2) Non-bonding M.O. with slight bonding character

(3) Pure non-bonding M.O.

(4) None of the above

Subtopic:  V.S.E.P.R & V.B.T |
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An incorrect match among the following is:

Electron geometry  Possible molecular shape from respective electron                                                                                                                                         geometry
1.  Tetrahedron   Bent
2. Trigonal bipyramidal      Triangular planar
3. Octahedron        Square Pyramidal
4. Pentagonal bipyramidal    Pentagonal planar

Subtopic:  Lattice & Hydration Energy |
 51%
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In which of the following species central atom is NOT surrounded by exactly 8 valence electrons?

(1) BF4-

(2) NCl3

(3) PCl4+

(4) SF4

Subtopic:  Types of Chemical Bond |
 56%
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The structure of B3N3H6 is as follows :

                                

How many derivative structures of B3N3H4X2 can be derived from the basic structure, by the

replacement of two hydrogen atoms?

(a) 2                                         (b) 3

(c) 4                                         (d) 5    

Subtopic:  Hybridisation |
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Correctly match is :

(1) dx2-y2 atomic orbital                                    One nodal plane 

(2) Py atomic orbital                                          Two nodal plane 

(3) σpx                                                              ψ (gerade)

(4) πpy                                                              ψ (ungerade)

Subtopic:  Covalent Bond |
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In which of the following molecular shape dz2- orbital must not be involved in bonding?

(1) Pentagonal planar 

(2) Trigonal planar 

(3) Linear 

(4) Square planar

Subtopic:  Hybridisation |
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Consider the following reaction:

MX4+X'2MX4X'2

If atomic number of M is 52 and X and X' are halogens and X' is more electronegative than X.

Then choose correct statement regarding given information:

(a) Both X' atoms occupy axial positions which are formed by overlapping of p and d-orbitals only

(b) All MX bond lengths are identical in both MX4 and MX4X'2 compounds

(c) Central atom 'M' does not use anyone valence non-axial set of d-orbital in hybridization of final product

(d) Hybridization of central atom 'M' remains same in both reactant and final product.

Subtopic:  Hybridisation |
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