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Chemical Bonding and Molecular Structure

NEET (UG) 2019MCQMedium📈 Topic in 62% papers+4−1
Ques. 1NEET (UG) 2019

Which of the following diatomic molecular species has only bonds according to Molecular Orbital Theory?

  1. C2
  2. Be2
  3. O2
  4. N2

Answer

(1) C2

Solution

C2 (12 electrons): 1s2 *1s2 2s2 *2s2 ( 2px2 = 2py2)

Bond order = 8 - 42 = 2, and both bonds come from the two π molecular orbitals ( 2pz is empty).

As per NCERT, the double bond in C2 consists of both π bonds.

N2 and O2 have one σ and π bonds; Be2 has bond order 0.

Answer: (1)

Keep practising — Chemical Bonding and Molecular Structure

Ques. 2NEET 2018

Consider the following species : CN+, CN-, NO and CN. Which one of these will have the highest bond order?

  1. NO
  2. CN-
  3. CN+
  4. CN
Ques. 3NEET 2018

In the structure of ClF3, the number of lone pairs of electrons on central atom ‘Cl’ is

  1. one
  2. two
  3. four
  4. three
Ques. 4NEET 2017

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

  1. TeI2, XeF2
  2. IBr2-, XeF2
  3. IF3, XeF2
  4. BeCl2, XeF2
Ques. 5NEET 2017

The species, having bond angles of 120 is

  1. ClF3
  2. NCl3
  3. BCl3
  4. PH3
Ques. 6NEET 2017

Which one of the following pairs of species have the same bond order ?

  1. O2, NO+
  2. CN-, CO
  3. N2, O2-
  4. CO, NO
Ques. 7NEET 2016 (Phase 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.
Ques. 8NEET 2016 (Phase 1)

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
Ques. 9NEET 2016 (Phase 2)

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

  1. H2O2
  2. HCN
  3. Cellulose
  4. Concentrated acetic acid
Ques. 10NEET 2016 (Phase 2)

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
Ques. 11NEET 2016 (Phase 2)

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

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

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