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Chemical Bonding and Molecular Structure · Question 108

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

Which species does not exhibit paramagnetism?

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

Answer

(3) CO

Solution

A species is paramagnetic when it has unpaired electrons.

N2+: 13 electrons (odd) ⇒ one unpaired electron ⇒ paramagnetic.

O2-: 17 electrons; *2px2 *2py1 ⇒ one unpaired electron ⇒ paramagnetic.

NO: 15 electrons (odd) ⇒ one unpaired electron ⇒ paramagnetic.

CO: 14 electrons (isoelectronic with N2) ⇒ all electrons paired ⇒ diamagnetic.

Answer: (3)

AIPMT 2000

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2

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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