Which one of the following is planar ?

(1) XeF4

(2) XeO4

(3) XeO3

(4) XeO3F2

Subtopic:  Hybridisation |
 73%
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The dielectric constant of H2O is 80. The electrostatic force of attraction between Na+ and Cl- will be

(1) reduced to 140 in water than in air

(2) reduced to 180 in water than in air

(3) will be increased to 80 in water than in air

(4) will remain unchanged

Subtopic:  Ionic Bond |
 72%
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Which of the following statement is not correct from the view point of molecular orbital theory ?

(1) Be2 is not a stable molecule

(2) He2 is not a stable but He2+ is expected to exist.

(3) Bond strength of N2 is maximum amongst the homonuclear diatomic molecules belonging to the second period.

(4) The order of energies of molecular orbitals in N2 molecule is

 s2s < s*2s < s2pz < (p2px=p2py) < (p*2px=p*2py) < s*2pz  

Subtopic:  M.O.T |
 71%
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PCl5 is highly unstable and in solid state it exists as into  [PCl4]and [PCl6]ions.

The geometry of [PCl6]- is   

(1) octahedral

(2) tetrahedral

(3) square pyramidal

(4) square planar

Subtopic:  Hybridisation |
 83%
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Which of the following species has maximum number of lone-pair of electrons on the central atom ?

(1) XeF2

(2) H3O+

(3) XeF4

(4) XeF6

 

Subtopic:  Hybridisation |
 92%
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The number of sigma bonds in P4O10 is 

(1) 6

(2) 16

(3) 20

(4) 7

Subtopic:  Covalent Bond |
 84%
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bonded molecule MX3 is T-shaped. The number of non-bonding pairs of electrons is :

(1) 0

(2) 2

(3) 1

(4) Can be predicted only if atomic number of M is known,

Subtopic:  Hybridisation |
 76%
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In a chemical change from PCl3             PCl5 the hybrid state of P changes from:

(1) sp2 to sp3

(2) sp3 to sp2

(3) sp3 to sp3d

(4) sp3 to dsp

Subtopic:  Hybridisation |
 94%
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In which case observed dipole moment is greater than theoretical dipole moment?

1.

2.

3.

4.

Subtopic:  Polarity |
 64%
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Amongst H2O, H2S, H2Se and H2Te the one with the highest boiling point is:

1. H2O because of H-bonding.

2. H2Te because of higher molecular weight.

3. H2S because of H-bonding.

4. H2Se because of lower molecular weight.

Subtopic:  van der Waal Force & Hydrogen Bonding |
 88%
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