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p-Block Elements (Group 13 & 14) · Question 9

JEE Main 2025 (Online) 7th April Morning ShiftMCQMedium📈 Topic in 19% papers+4−1
1

The group 14 elements A and B have the first ionisation enthalpy values of 708 and 715 kJ mol-1 respectively. The above values are lowest among their group members. The nature of their ions A2+ and B4+ respectively is

  1. both reducing
  2. oxidising and reducing
  3. both oxidising
  4. reducing and oxidising

Answer

(4) reducing and oxidising

Solution

As per NCERT, iH1 ( kJ mol-1): C 1086, Si 786, Ge 761, Sn 708, Pb 715

A = Sn, B = Pb

Due to the inert pair effect, the stability of the +2 state increases down the group.

Sn: +4 is more stable than +2 Sn2+ Sn4+ + 2e- Sn2+ is a reducing agent.

Pb: +2 is more stable than +4 Pb4+ + 2e- Pb2+ Pb4+ is an oxidising agent.

Answer: (4)

JEE Main 2025 (Online) 7th April Morning Shift

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

2

The correct statements from the following are : Choose the correct answer from the options given below :

  1. A, B, D and E only
  2. A, C and D only
  3. A, B, C and E
  4. B, D and E only
JEE Main 2025 (Online) 7th April Evening Shift
3

Given below are the pairs of group 13 elements showing their relation in terms of atomic radius. (B < Al), (Al < Ga), (Ga < In) and (In < Tl). Identify the elements present in the incorrect pair and in that pair find out the element (X) that has higher ionic radius (M3+) than the other one. The atomic number of the element (X) is

  1. 49
  2. 81
  3. 31
  4. 13
JEE Main 2025 (Online) 4th April Morning Shift
4

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Statement I is correct but Statement II is incorrect
  2. Both Statement I and Statement II are incorrect
  3. Statement I is incorrect but Statement II is correct
  4. Both Statement I and Statement II are correct
JEE Main 2025 (Online) 4th April Evening Shift
5

The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively :

  1. B & Tl
  2. Tl & B
  3. B & In
  4. B & Ga
JEE Main 2025 (Online) 4th April Evening Shift
6

The correct orders among the following are Choose the correct answer from the options given below:

  1. B and D Only
  2. A and B Only
  3. C and D Only
  4. A and C Only
JEE Main 2025 (Online) 3rd April Evening Shift
7

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Statement I is correct but Statement II is incorrect
  2. Both Statement I and Statement II are correct
  3. Statement I is incorrect but Statement II is correct
  4. Both Statement I and Statement II are incorrect
JEE Main 2025 (Online) 2nd April Morning Shift
8

The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidising capacity.

  1. E Sn4+/Sn2+ = +0.15 V
  2. E Al3+/Al = -1.66 V
  3. E Pb4+/Pb2+ = +1.67 V
  4. E Tl3+/Tl = +1.26 V
JEE Main 2025 (Online) 29th January Morning Shift
9

Consider the following elements In, Tl, Al, Pb, Sn and Ge. The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are

  1. +4 and +1
  2. +4 and +3
  3. +1 and +4
  4. +2 and +3
JEE Main 2025 (Online) 28th January Morning Shift

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