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Classification of Elements and Periodicity in Properties

AIPMT 2002MCQEasy📈 Topic in 38% papers+4−1
Ques. 1AIPMT 2002

Which of the following is isoelectronic?

  1. CO2, NO2
  2. NO2-, CO2
  3. CN-, CO
  4. SO2, CO2

Answer

(3) CN-, CO

Solution

Isoelectronic species have the same total number of electrons.

⇒ CO2 = 6 + 16 = 22; NO2 = 7 + 16 = 23

⇒ NO2- = 23 + 1 = 24; SO2 = 16 + 16 = 32

⇒ CN- = 6 + 7 + 1 = 14; CO = 6 + 8 = 14

∴ CN- and CO are isoelectronic.

Answer: (3)

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Ques. 2AIPMT 2002

Which of the following order is wrong?

  1. NH3 < PH3 < AsH3 – acidic
  2. Li < Be < B < C – 1st IP
  3. Al2O3 < MgO < Na2O < K2O – basic
  4. Li+ < Na+ < K+ < Cs+ – ionic radius
Ques. 3AIPMT 2002

An atom has electronic configuration 1s2 2s2 2p6 3s2 3p6 3d3 4s2, you will place it in which group?

  1. fifth
  2. fifteenth
  3. second
  4. third
Ques. 4AIPMT 2001

Correct order of 1st ionization potential among following elements Be, B, C, N, O is

  1. B < Be < C < O < N
  2. B < Be < C < N < O
  3. Be < B < C < N < O
  4. Be < B < C < O < N

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