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Classification of Elements and Periodicity in Properties · Question 22

AIPMT 2014MCQEasy📈 Topic in 38% papers+4−1
1

Which of the following orders of ionic radii is correctly represented?

  1. H- > H > H+
  2. Na+ > F- > O2-
  3. F- > O2- > Na+
  4. Al3+ > Mg2+ > N3-

Answer

(1) H- > H > H+

Solution

For the same element, radius decreases as electrons are removed: anion > neutral atom > cation.

⇒ H- > H > H+ (correct).

For isoelectronic ions ( N3-, O2-, F-, Na+, Mg2+, Al3+, 10 electrons each), radius decreases as nuclear charge increases:

N3- > O2- > F- > Na+ > Mg2+ > Al3+

∴ options (2), (3) and (4) are wrong.

Answer: (1)

AIPMT 2014

Keep practising — Classification of Elements and Periodicity in Properties

2

Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O?

  1. Al < Ca < O < C < F
  2. Al < O < C < Ca < F
  3. C < F < O < Al < Ca
  4. Ca < Al < C < O < F
NEET 2013 (Karnataka)
3

Identify the wrong statement in the following.

  1. Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius.
  2. Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius.
  3. Atomic radius of the elements increases as one moves down the first group of the periodic table.
  4. Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table.
AIPMT 2012 (Prelims)
4

What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?

  1. -5.1 eV
  2. -10.2 eV
  3. +2.55 eV
  4. +10.2 eV
AIPMT 2011 (Mains)
5

Which of the following oxide is amphoteric?

  1. SnO2
  2. CaO
  3. SiO2
  4. CO2
AIPMT 2011 (Mains)
6

Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is

  1. Mg < Ca < Cl < P
  2. Cl < P < Mg < Ca
  3. P < Cl < Ca < Mg
  4. Ca < Mg < P < Cl
AIPMT 2010 (Mains)
7

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

  1. CsI
  2. CsF
  3. LiF
  4. NaF
AIPMT 2010 (Mains)
8

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)
9

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)
10

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
11

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

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