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

JEE Main 2025 (Online) 4th April Evening ShiftMCQEasy📈 Topic in 32% papers+4−1
1

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

Answer

(1) Statement I is correct but Statement II is incorrect

Solution

Statement I: Across a period, nuclear charge increases and size decreases, so group 14 elements have higher first ionisation enthalpy than group 13 elements ( kJ mol-1):

B 801 < C 1086; Al 577 < Si 786; Ga 579 < Ge 762; In 558 < Sn 708; Tl 589 < Pb 715

Statement I is correct.

Statement II: Group 14 elements (C, Si, Ge) form giant covalent structures, so their melting points are much higher (K):

B 2453 < C 4373; Al 933 < Si 1693; Ga 303 < Ge 1218; In 430 < Sn 505; Tl 576 < Pb 600

Melting and boiling points of group 13 elements are lower, not higher. Statement II is incorrect.

Answer: (1)

JEE Main 2025 (Online) 4th April Evening Shift

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

2

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
3

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
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 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
5

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
6

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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