PCl5 exists but NCl5 does not because:

(a) nitrogen has no vacant 2d-orbitals 

(b)NCl5 is unstable 

(c) nitrogen atom is much smaller than p

(d) nitrogen is highly inert 

Concept Questions :-

Acid, Base and Fajan's Rule
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Bond angle between two hybrid orbitals is 105°.% S character orbital is:

1. between 30-31%

2. between 19-20%

3. between 25 -26%

4. between 22-23%

Concept Questions :-

Hybridisation
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Which bond angle would result in the maximum dipole moment for the triatomic molecule XY2 shown below?

(a) 90°

(b) 120°

(c) 150°

(d) 180°

Concept Questions :-

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The hydrogen bonding is strongest in:

(a) OHS

(b) SHO

(c) FHF

(d) FHO

Concept Questions :-

Hydrogen Bonding
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The ionisation energy will be maximum for the process:

(a) BaBa2+

(b) BeBe2+

(c) CsCs+

(d) LiLi+

Concept Questions :-

Ionic Bonding
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In which of the process, the bond order increases and magnetic behaviour changes?

(a) N2N2+

(b) C2C2+

(c) NONO+

(d) O2O2+

Concept Questions :-

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In piperidine  atom has hybridization:

1. sp

2. sp2

3. sp3

4. dsp2

Concept Questions :-

Hybridisation
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Specify the coordination geometry around and hybridization of N and B atoms in a 1:1 complex of BF3 and NH3:

(a) N: tetrahedral, sp3; B : tetrahedral, sp3

(b) N: pyramidal, sp3; B : pyramidal, sp3

(c) N: pyramidal, sp3; B: planar, sp2

(d) N: pyramidal, sp3; B: tetrahedral, sp3

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Assuming 2s-2p mixing is NOT operative, the paramagnetic species among the following is :

(a) Be2

(b) B2

(c) C2

(d) N2

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When O2 is adsorbed on a metallic surface, electron transfer occurs from the ,metal to O2. The wrong statements(s) regarding this adsorption is (are): 

(a) O2 is physisorbed 

(b) Heat is released

(c) Occupancy of π*2p of O2 is increased 

(d) Bond length of O2 is increased

Concept Questions :-

Covalent Bonding
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