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Chemical Bonding and Molecular Structure · Question 37

NEET 2016 (Phase 2)Multiple CorrectMedium📈 Topic in 75% papers+4−1
1

Which of the following pairs of ions is isoelectronic and isostructural?

  1. CO32-, NO3-
  2. ClO3-, CO32-
  3. SO32-, NO3-
  4. ClO3-, SO32-

Answer

(1) CO32-, NO3-, (4) ClO3-, SO32-

Solution

Total electrons:

CO32-=6+3(8)+2=32 ; NO3-=7+3(8)+1=32

ClO3-=17+3(8)+1=42 ; SO32-=16+3(8)+2=42

Shapes (VSEPR):

CO32- and NO3- ⇒ 3 bond pairs, no lone pair, sp2 ⇒ both trigonal planar.

ClO3- and SO32- ⇒ 3 bond pairs + 1 lone pair, sp3 ⇒ both trigonal pyramidal.

Pairs (2) and (3) have 32 and 42 electrons ⇒ not isoelectronic.

∴ Pairs (1) and (4) are isoelectronic as well as isostructural.

Answer: (1), (4)

NEET 2016 (Phase 2)

Keep practising — Chemical Bonding and Molecular Structure

2

The correct geometry and hybridization for XeF4 are

  1. octahedral, sp3d2
  2. trigonal bipyramidal, sp3d
  3. planar triangle, sp3d3
  4. square planar, sp3d2
NEET 2016 (Phase 2)
3

Among the following, which one is a wrong statement ?

  1. PH5 and BiCl5 do not exist.
  2. p -d bonds are present in SO2.
  3. SeF4 and CH4 have same shape.
  4. I3+ has bent geometry.
NEET 2016 (Phase 2)
4

In which of the following pairs, both the species are not isostructural ?

  1. Diamond, Silicon carbide
  2. NH3, PH3
  3. XeF4, XeO4
  4. SiCl4, PCl4+
AIPMT 2015
5

Decreasing order of stability of O2, O2-, O2+ and O22- is

  1. O22- > O2- > O2 > O2+
  2. O2 > O2+ > O22- > O2-
  3. O2- > O22- > O2+ > O2
  4. O2+ > O2 > O2- > O22-
AIPMT 2015
6

Which of the following pairs of ions are isoelectronic and isostructural ?

  1. SO32-, NO3-
  2. ClO3-, SO32-
  3. CO32-, SO32-
  4. ClO3-, CO32-
AIPMT 2015 (Cancelled)
7

The correct bond order in the following species is

  1. O2+ < O2- < O22+
  2. O2- < O2+ < O22+
  3. O22+ < O2+ < O2-
  4. O22+ < O2- < O2+
AIPMT 2015 (Cancelled)
8

Which of the following options represents the correct bond order ?

  1. O2- > O2 < O2+
  2. O2- < O2 > O2+
  3. O2- > O2 > O2+
  4. O2- < O2 < O2+
AIPMT 2015 (Cancelled)
9

Maximum bond angle at nitrogen is present in which of the following ?

  1. NO2+
  2. NO3-
  3. NO2
  4. NO2-
AIPMT 2015 (Cancelled)
10

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

  1. (CN)2
  2. CH2(CN)2
  3. HCO3-
  4. XeO4
AIPMT 2015 (Cancelled)
11

Which of the following molecules has the maximum dipole moment?

  1. CO2
  2. CH4
  3. NH3
  4. NF3
AIPMT 2014

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