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Chemical Bonding and Molecular Structure · Question 33

NEET 2016 (Phase 1)MCQEasy📈 Topic in 75% papers+4−1
1

Consider the molecules CH4, NH3 and H2O. Which of the given statements is false?

  1. The H-O-H bond angle in H2O is smaller than the H-N-H bond angle in NH3.
  2. The H-C-H bond angle in CH4 is larger than the H-N-H bond angle in NH3.
  3. The H-C-H bond angle in CH4, the H-N-H bond angle in NH3, and the H-O-H bond angle in H2O are all greater than 90 .
  4. The H-O-H bond angle in H2O is larger than the H-C-H bond angle in CH4.

Answer

(4) The H-O-H bond angle in H2O is larger than the H-C-H bond angle in CH4.

Solution

All three central atoms are sp3 hybridised (4 electron pairs).

As per NCERT: CH4 (0 lone pair) = 109.5 ; NH3 (1 lone pair) = 107 ; H2O (2 lone pairs) = 104.5 .

∵ lp–bp repulsion > bp–bp repulsion ⇒ more lone pairs, smaller bond angle.

⇒ Statements (1), (2) and (3) are true.

∴ (4) is false, since 104.5 (H2O) < 109.5 (CH4).

Answer: (4)

NEET 2016 (Phase 1)

Keep practising — Chemical Bonding and Molecular Structure

2

Predict the correct order among the following :

  1. bond pair - bond pair > lone pair - bond pair > lone pair - lone pair
  2. lone pair - bond pair > bond pair - bond pair > lone pair - lone pair
  3. lone pair - lone pair > lone pair - bond pair > bond pair - bond pair
  4. lone pair - lone pair > bond pair - bond pair > lone pair - bond pair
NEET 2016 (Phase 1)
3

Which one of the following compounds shows the presence of intramolecular hydrogen bond?

  1. H2O2
  2. HCN
  3. Cellulose
  4. Concentrated acetic acid
NEET 2016 (Phase 2)
4

The hybridizations of atomic orbitals of nitrogen in NO2+, NO3- and NH4+ respectively are

  1. sp, sp3 and sp2
  2. sp2, sp3 and sp
  3. sp, sp2 and sp3
  4. sp2, sp and sp3
NEET 2016 (Phase 2)
5

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

  1. CO32-, NO3-
  2. ClO3-, CO32-
  3. SO32-, NO3-
  4. ClO3-, SO32-
NEET 2016 (Phase 2)
6

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)
7

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)
8

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
9

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
10

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)
11

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)

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