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Classification of Elements and Periodicity in Properties · Question 40

AIPMT 2002MCQMedium📈 Topic in 50% papers+4−1
1

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

Answer

(2) Li < Be < B < C – 1st IP

Solution

(1) Acidic character of hydrides increases down group 15 (E–H bond weakens) ⇒ correct.

(2) As per NCERT, B has a lower first ionisation enthalpy than Be (the 2p electron of B is easier to remove than a 2s electron of Be).

Correct order: Li < B < Be < C ⇒ the given order is wrong.

(3) Basic character of oxides increases with metallic character ⇒ correct.

(4) Ionic radius increases down the group ⇒ correct.

Answer: (2)

AIPMT 2002

Keep practising — Classification of Elements and Periodicity in Properties

2

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
AIPMT 2002
3

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
AIPMT 2001

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