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Classification of Elements and Periodicity in Properties · Question 28

AIPMT 2010 (Mains)MCQEasy📈 Topic in 38% papers+4−1
1

Among the following which one has the highest cation to anion size ratio?

  1. CsI
  2. CsF
  3. LiF
  4. NaF

Answer

(2) CsF

Solution

The ratio r+r- is highest for the largest cation with the smallest anion.

Among the cations, Cs+ is the largest; among the anions, F- is the smallest.

⇒ CsF: rCs+rF- = 167133 1.26

while CsI 0.76, NaF 0.77, LiF 0.57.

∴ CsF has the highest cation to anion size ratio.

Answer: (2)

AIPMT 2010 (Mains)

Keep practising — Classification of Elements and Periodicity in Properties

2

The correct order of the decreasing ionic radii among the following isoelectronic species is

  1. Ca2+ > K+ > S2- > Cl-
  2. Cl- > S2- > Ca2+ > K+
  3. S2- > Cl- > K+ > Ca2+
  4. K+ > Ca2+ > Cl- > S2-
AIPMT 2010 (Prelims)
3

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl ?

  1. Cl < F < O < S
  2. O < S < F < Cl
  3. F < S < O < Cl
  4. S < O < Cl < F
AIPMT 2010 (Prelims)
4

Amongst the elements with following electronic configurations, which one of them may have the highest ionisation energy ?

  1. [Ne] 3s2 3p2
  2. [Ar] 3d10 4s2 4p3
  3. [Ne] 3s2 3p1
  4. [Ne] 3s2 3p3
AIPMT 2009
5

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-
AIPMT 2007
6

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
7

Which of the following is the most basic oxide?

  1. SeO2
  2. Al2O3
  3. Sb2O3
  4. Bi2O3
AIPMT 2006
8

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
9

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
10

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
11

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

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