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Chemical Bonding and Molecular Structure · Question 47

AIPMT 2014MCQEasy📈 Topic in 12% papers+4−1
1

Which of the following molecules has the maximum dipole moment?

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

Answer

(3) NH3

Solution

CO2 (linear) and CH4 (tetrahedral) are symmetrical ⇒ μ = 0.

In NH3 the lone-pair moment and the N–H bond moments point in the same direction ⇒ they add up ( = 4.90 10-30 C m).

In NF3 the N–F bond moments oppose the lone-pair moment ⇒ small resultant ( = 0.80 10-30 C m).

∴ NH3 has the maximum dipole moment.

Answer: (3)

AIPMT 2014

Keep practising — Chemical Bonding and Molecular Structure

2

Which one of the following species has plane triangular shape?

  1. N3-
  2. NO3-
  3. NO2-
  4. CO2
AIPMT 2014
3

XeF2 is isostructural with

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

Which of the following is a polar molecule?

  1. SiF4
  2. XeF4
  3. BF3
  4. SF4
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5

Which of the following is paramagnetic?

  1. CN-
  2. NO+
  3. CO
  4. O2-
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6

Which one of the following molecules contains no bond?

  1. SO2
  2. NO2
  3. CO2
  4. H2O
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7

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
NEET 2013 (Karnataka)
8

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

  1. SiF4, BeH2
  2. NF3, H2O
  3. NF3, BF3
  4. H2S, BF3
NEET 2013 (Karnataka)
9

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+
NEET 2013 (Karnataka)
10

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
AIPMT 2012 (Mains)
11

Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them

  1. NO < O2- < C22- < He2+
  2. O2- < NO < C22- < He2+
  3. C22- < He2+ < O2- < NO
  4. He2+ < O2- < NO < C22-
AIPMT 2012 (Mains)

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