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p-Block Elements (Group 13 & 14) · Question 17

JEE Main 2025 (Online) 28th January Morning ShiftMCQMedium📈 Topic in 19% papers+4−1
1

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

Answer

(2) +4 and +3

Solution

First ionisation enthalpies ( kJ mol-1):

Group 13: Al 577, In 558, Tl 589

Group 14: Ge 762, Sn 708, Pb 715

Highest: Ge the inert pair effect is weak for Ge, so its most stable oxidation state is +4 (Ge(II) compounds are reducing).

Lowest: In its most stable oxidation state is +3 (the +1 state becomes the more stable one only at Tl).

Answer: (2)

JEE Main 2025 (Online) 28th January Morning Shift

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

2

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

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 6th April Morning Shift
3

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

  1. Both Statement I and Statement II are true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
JEE Main 2026 (Online) 5th April Evening Shift
4

The electronegativity of a group 13 element 'E' is same as that of Ge (on Pauling scale and upto one decimal point). The CORRECT statements about E3+ are Choose the correct answer from the options given below :

  1. A and C Only
  2. B and C Only
  3. B and D Only
  4. A and D Only
JEE Main 2026 (Online) 4th April Evening Shift
5

Consider the following reactions Na2B4O7 2X + Y CuSO4 + Y Non-luminous flame Z + SO3 2Z + 2X + Carbon Luminous flame 2Q + Na2B4O7 + CO The oxidation states of Cu in Z and Q, respectively are :

  1. +2 and +1
  2. +1 and +1
  3. +1 and +2
  4. +2 and +2
JEE Main 2026 (Online) 28th January Evening Shift
6

Choose the INCORRECT statement

  1. Carbon exhibits negative oxidation states along with +4 and +2.
  2. Carbon cannot exceed its covalency more than four.
  3. Among the isotopes of carbon, 13C is a radioactive isotope.
  4. CO2 is the most acidic oxide among the dioxides of group 14 elements.
JEE Main 2026 (Online) 24th January Evening Shift
7

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

  1. B and D Only
  2. C and D Only
  3. A and D Only
  4. A and C Only
JEE Main 2026 (Online) 23rd January Morning Shift
8

It is noticed that Pb2+ is more stable than Pb4+ but Sn2+ is less stable than Sn4+. Observe the following reactions. PbO2 + Pb 2PbO; rG (1) SnO2 + Sn 2SnO; rG (2) Identify the correct set from the following

  1. rG (1) > 0; rG (2) < 0
  2. rG (1) < 0; rG (2) > 0
  3. rG (1) < 0; rG (2) < 0
  4. rG (1) > 0; rG (2) > 0
JEE Main 2026 (Online) 23rd January Evening Shift
9

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

  1. Both Statement I and Statement II are false
  2. Statement I is false but Statement II is true
  3. Both Statement I and Statement II are true
  4. Statement I is true but Statement II is false
JEE Main 2026 (Online) 21st January Morning Shift
10

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
JEE Main 2025 (Online) 7th April Morning Shift
11

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

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