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p-Block Elements (Group 13 & 14) · Question 5

NEET (UG) 2022MCQEasy📈 Topic in 50% papers+4−1
1

Which of the following statements is not correct about diborane?

  1. There are two 3-centre-2-electron bonds.
  2. The four terminal B-H bonds are two centre two electron bonds.
  3. The four terminal hydrogen atoms and the two boron atoms lie in one plane.
  4. Both the boron atoms are sp2 hybridised.

Answer

(4) Both the boron atoms are sp2 hybridised.

Solution

As per NCERT, in diborane (B2H6) the four terminal hydrogen atoms and the two boron atoms lie in one plane — (3) is correct.

⇒ The four terminal B–H bonds are regular two centre–two electron bonds — (2) is correct.

⇒ The two bridging B–H–B bonds are three centre–two electron (banana) bonds — (1) is correct.

⇒ Each boron atom uses sp3 hybrid orbitals (tetrahedral arrangement), not sp2.

∴ Statement (4) is not correct.

Answer: (4)

NEET (UG) 2022

Keep practising — p-Block Elements (Group 13 & 14)

2

Choose the correct statement:

  1. Diamond and graphite have two dimensional network.
  2. Diamond is covalent and graphite is ionic.
  3. Diamond is sp3 hybridized and graphite is sp2 hybridized.
  4. Both diamond and graphite are used as dry lubricants.
Out of syllabusNEET (UG) 2022
3

Match List-I with List-II : Choose the correct answer from the options given below :

  1. (a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
  2. (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
  3. (a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
  4. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
NEET (UG) 2022 (Phase 2)
4

Na2B4O7 heat X + NaBO2 in the above reaction the product "X" is :

  1. NaB3O5
  2. H3BO3
  3. B2O3
  4. Na2B2O5
NEET (UG) 2022 (Phase 2)
5

Identify the correct statements from the following :

  1. A and C only
  2. B and C only
  3. C and D only
  4. A, B and C only
NEET (UG) 2020
6

Which of the following is incorrect statement?

  1. GeX4 (X = F, Cl, Br, I) is more stable than GeX2
  2. SnF4 is ionic in nature
  3. PbF4 is covalent in nature
  4. SiCl4 is easily hydrolysed
NEET (UG) 2019
7

Which of the following species is not stable?

  1. [Sn(OH)6]2-
  2. [SiCl6]2-
  3. [SiF6]2-
  4. [GeCl6]2-
NEET (UG) 2019
8

The correct order of atomic radii in group 13 elements is

  1. B < Al < In < Ga < Tl
  2. B < Al < Ga < In < Tl
  3. B < Ga < Al < Tl < In
  4. B < Ga < Al < In < Tl
NEET 2018
9

Which one of the following elements is unable to form MF63- ion?

  1. Ga
  2. Al
  3. B
  4. In
NEET 2018
10

It is because of inability of ns2 electrons of the valence shell to participate in bonding that

  1. Sn2+ is oxidising while Pb4+ is reducing
  2. Sn2+ and Pb2+ are both oxidising and reducing
  3. Sn4+ is reducing while Pb4+ is oxidising
  4. Sn2+ is reducing while Pb4+ is oxidising
NEET 2017
11

Boric acid is an acid because its molecule

  1. contains replaceable H+ ion
  2. gives up a proton
  3. accepts OH- from water releasing proton
  4. combines with proton from water molecule.
NEET 2016 (Phase 2)

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