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Classification of Elements and Periodicity in Properties

JEE Main 2024 (Online) 29th January Evening ShiftMCQEasy📈 Topic in 32% papers+4−1
Ques. 1JEE Main 2024, 29 January (Evening Shift)

The element having the highest first ionization enthalpy is

  1. C
  2. Al
  3. Si
  4. N

Answer

(4) N

Solution

iH1 (kJ mol-1): Al 577 < Si 786 < C 1086 < N 1402

∵ IE increases across a period and decreases down a group; N also has a stable half-filled 2p3 configuration

⇒ N is highest

Answer: (4)

Keep practising — Classification of Elements and Periodicity in Properties

Ques. 2JEE Main 2024, 27 January (Morning Shift)

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 false but Statement II is true
  2. Both Statement I and Statement II are true
  3. Statement I is true but Statement II is false
  4. Both Statement I and Statement II are false

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