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Classification of Elements and Periodicity in Properties · Question 32

AIPMT 2007MCQMedium📈 Topic in 38% papers+4−1
1

Identify the correct order of the size of the following:

  1. Ca2+ < K+ < Ar < Cl- < S2-
  2. Ar < Ca2+ < K+ < Cl- < S2-
  3. Ca2+ < Ar < K+ < Cl- < S2-
  4. Ca2+ < K+ < Ar < S2- < Cl-

Answer

(1) Ca2+ < K+ < Ar < Cl- < S2-

Solution

Ca2+, K+, Ar, Cl- and S2- are isoelectronic (18 electrons each).

As per NCERT, among isoelectronic species, the greater the nuclear charge, the greater is the attraction for the electrons and the smaller is the size.

Nuclear charge: Ca (20) > K (19) > Ar (18) > Cl (17) > S (16)

∴ Size: Ca2+ < K+ < Ar < Cl- < S2-

Answer: (1)

AIPMT 2007

Keep practising — Classification of Elements and Periodicity in Properties

2

With which of the following electronic configuration an atom has the lowest ionisation enthalpy?

  1. 1s2 2s2 2p3
  2. 1s2 2s2 2p6 3s1
  3. 1s2 2s2 2p6
  4. 1s2 2s2 2p5
AIPMT 2007
3

Which of the following is the most basic oxide?

  1. SeO2
  2. Al2O3
  3. Sb2O3
  4. Bi2O3
AIPMT 2006
4

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species ?

  1. S < O < Cl < F
  2. Cl < F < S < O
  3. F < Cl < O < S
  4. O < S < F < Cl
AIPMT 2005
5

A nuclide of an alkaline earth metal undergoes radioactive decay by emission of three -particles in succession. The group of the periodic table to which the resulting daughter element would belong is

  1. Gr. 13
  2. Gr. 17
  3. Gr. 14
  4. Gr. 16
AIPMT 2005
6

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.
AIPMT 2004
7

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
8

Which of the following is isoelectronic?

  1. CO2, NO2
  2. NO2-, CO2
  3. CN-, CO
  4. SO2, CO2
AIPMT 2002
9

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
10

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
11

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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