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Chemical Bonding and Molecular Structure · Question 46

AIPMT 2015 (Cancelled)MCQMedium📈 Topic in 12% papers+4−1
1

Which of the following species contains equal number of σ- and π-bonds ?

  1. (CN)2
  2. CH2(CN)2
  3. HCO3-
  4. XeO4

Answer

(4) XeO4

Solution

A single bond = 1σ; a double bond = 1σ + 1π; a triple bond = 1σ + 2π.

(CN)2: N C-C N ⇒ 3σ, 4π

CH2(CN)2: N C-CH2-C N ⇒ 6σ, 4π

HCO3-: one C=O, two C–O, one O–H ⇒ 4σ, 1π

XeO4: Xe forms four Xe=O bonds (sp³, tetrahedral, four pπ–dπ bonds) ⇒ 4σ, 4π

∴ XeO4 has equal numbers of σ and π bonds.

Answer: (4)

AIPMT 2015 (Cancelled)

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2

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  1. CO2
  2. CH4
  3. NH3
  4. NF3
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3

Which one of the following species has plane triangular shape?

  1. N3-
  2. NO3-
  3. NO2-
  4. CO2
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4

XeF2 is isostructural with

  1. SbCl3
  2. BaCl2
  3. TeF2
  4. ICl2-
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5

Which of the following is a polar molecule?

  1. SiF4
  2. XeF4
  3. BF3
  4. SF4
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6

Which of the following is paramagnetic?

  1. CN-
  2. NO+
  3. CO
  4. O2-
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7

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  1. SO2
  2. NO2
  3. CO2
  4. H2O
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8

The pair of species that has the same bond order in the following is

  1. CO, NO+
  2. NO-, CN-
  3. O2, N2
  4. O2, B2
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9

In which of the following pair both the species have sp3 hybridization ?

  1. SiF4, BeH2
  2. NF3, H2O
  3. NF3, BF3
  4. H2S, BF3
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10

In which of the following ionization processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic.

  1. O2 O2+
  2. C2 C2+
  3. NO NO+
  4. N2 N2+
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11

During change of O2 to O2- ion, the electron adds on which one of the following orbitals ?

  1. * orbital
  2. orbital
  3. * orbital
  4. orbital
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