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Chemical Bonding and Molecular Structure · Question 107

AIPMT 2000MCQEasy📈 Topic in 62% papers+4−1
1

Right order of dissociation energy N2 and N2+ is

  1. N2 > N2+
  2. N2 = N2+
  3. N2+ > N2
  4. none

Answer

(1) N2 > N2+

Solution

As per NCERT (MO theory), N2 (14 electrons):

1s2 *1s2 2s2 *2s2 ( 2px2 = 2py2) 2pz2

⇒ Bond order = 10 - 42 = 3

N2+ (13 electrons): one electron is removed from the bonding 2pz orbital.

⇒ Bond order = 9 - 42 = 2.5

∵ Higher bond order ⇒ stronger bond ⇒ higher dissociation energy

∴ N2 > N2+

Answer: (1)

AIPMT 2000

Keep practising — Chemical Bonding and Molecular Structure

2

Which species does not exhibit paramagnetism?

  1. N2+
  2. O2-
  3. CO
  4. NO
AIPMT 2000
3

Which compound forms linear polymer due to H-bond?

  1. H2O
  2. NH3
  3. HF
  4. HCl
Out of syllabusAIPMT 2000

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