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p-Block Elements (Group 13 & 14) · Question 8

NEET (UG) 2022 (Phase 2)MCQEasy📈 Topic in 50% papers+4−1
1

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

  1. NaB3O5
  2. H3BO3
  3. B2O3
  4. Na2B2O5

Answer

(3) B2O3

Solution

As per NCERT, on heating, borax first loses water of crystallisation and swells up; on further heating it turns into a transparent liquid which solidifies into a glass-like material known as borax bead.

Na2B4O7 10H2O Na2B4O7 2NaBO2 + B2O3

(sodium metaborate + boric anhydride)

X is B2O3.

Answer: (3)

NEET (UG) 2022 (Phase 2)

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

2

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
3

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
4

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
5

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
6

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

  1. Ga
  2. Al
  3. B
  4. In
NEET 2018
7

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
8

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)
9

AlF3 is soluble in HF only in presence of KF. It is due to the formation of

  1. K3[AlF3H3]
  2. K3[AlF6]
  3. AlH3
  4. K[AlF3H]
NEET 2016 (Phase 2)
10

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence

  1. Al < Ga < In < Tl
  2. Tl < In < Ga < Al
  3. In < Tl < Ga < Al
  4. Ga < In < Al < Tl
AIPMT 2015
11

Which of the following is electron-deficient ?

  1. (BH3)2
  2. PH3
  3. (CH3)2
  4. (SiH3)2
NEET 2013

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