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Classification of Elements and Periodicity in Properties · Question 37

AIPMT 2004MCQEasy📈 Topic in 38% papers+4−1
1

Ionic radii are

  1. inversely proportional to effective nuclear charge
  2. inversely proportional to square of effective nuclear charge
  3. directly proportional to effective nuclear charge
  4. directly proportional to square of effective nuclear charge.

Answer

(1) inversely proportional to effective nuclear charge

Solution

The size of an ion is decided by the attraction of the nucleus on the outer electrons, i.e. by the effective nuclear charge ( Zeff).

⇒ Greater Zeff ⇒ electrons pulled closer ⇒ smaller ion.

As per NCERT, in an isoelectronic series the greater the nuclear charge, the smaller the ion (e.g. Mg2+ < Na+ < F- < O2-).

∴ Ionic radius 1 Zeff

Answer: (1)

AIPMT 2004

Keep practising — Classification of Elements and Periodicity in Properties

2

The ions O2-, F-, Na+, Mg2+ and Al3+ are isoelectronic. Their ionic radii show

  1. a significant increase from O2- to Al3+
  2. a significant decrease from O2- to Al3+
  3. an increase from O2- to F- and then decrease from Na+ to Al3+
  4. a decrease from O2- to F- and then increase from Na+ to Al3+
AIPMT 2003
3

Which of the following is isoelectronic?

  1. CO2, NO2
  2. NO2-, CO2
  3. CN-, CO
  4. SO2, CO2
AIPMT 2002
4

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
AIPMT 2002
5

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
6

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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