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p-Block Elements (Group 13 & 14) · Question 12

NEET 2018MCQEasy📈 Topic in 50% papers+4−1
1

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

Answer

(4) B < Ga < Al < In < Tl

Solution

Atomic radii (NCERT): B = 85 pm, Al = 143 pm, Ga = 135 pm, In = 167 pm, Tl = 170 pm.

As per NCERT, Ga is smaller than Al because the ten 3d electrons in Ga shield the nucleus poorly ⇒ higher effective nuclear charge.

∴ B < Ga < Al < In < Tl

Answer: (4)

NEET 2018

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

2

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

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

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
4

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)
5

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)
6

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
7

Which of the following is electron-deficient ?

  1. (BH3)2
  2. PH3
  3. (CH3)2
  4. (SiH3)2
NEET 2013
8

Which of the following structure is similar to graphite?

  1. B4C
  2. B2H6
  3. BN
  4. B
NEET 2013
9

Which of these is not a monomer for a high molecular mass silicone polymer?

  1. Me3SiCl
  2. PhSiCl3
  3. MeSiCl3
  4. Me2SiCl2
NEET 2013
10

The basic structural unit of silicates is

  1. SiO32-
  2. SiO42-
  3. SiO-
  4. SiO44-
NEET 2013
11

Which statement is wrong?

  1. Beryl is an example of cyclic silicate.
  2. Mg2SiO4 is orthosilicate.
  3. Basic structural unit in silicates is the SiO4 tetrahedron.
  4. Feldspars are not aluminosilicates.
NEET 2013 (Karnataka)

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