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Classification of Elements and Periodicity in Properties · Question 19

NEET 2016 (Phase 1)Multiple CorrectMedium📈 Topic in 12% papers+4−1
1

In which of the following options the order of arrangement does not agree with the variation of property indicated against it ?

  1. I < Br < Cl < F (increasing electron gain enthalpy)
  2. Li < Na < K < Rb (increasing metallic radius)
  3. Al3+ < Mg2+ < Na+ < F- (increasing ionic size)
  4. B < C < N < O (increasing first ionisation enthalpy)

Answer

(1) I < Br < Cl < F (increasing electron gain enthalpy), (4) B < C < N < O (increasing first ionisation enthalpy)

Solution

(1) As per NCERT, Cl has the most negative electron gain enthalpy; F is less negative than Cl because of its small size (strong inter-electronic repulsion in the compact 2p subshell).

⇒ Correct order of magnitude: I < Br < F < Cl ⇒ the given order does not agree.

(2) Metallic radius increases down the group: Li < Na < K < Rb ⇒ agrees.

(3) Isoelectronic species (10 electrons): size decreases as nuclear charge increases ⇒ Al3+ < Mg2+ < Na+ < F- ⇒ agrees.

(4) ∵ N has a stable half-filled 2p3 configuration, its first ionisation enthalpy is higher than that of O.

⇒ Correct order: B < C < O < N ⇒ the given order does not agree.

∴ Options (1) and (4) do not agree with the property indicated.

Answer: (1), (4)

NEET 2016 (Phase 1)

Keep practising — Classification of Elements and Periodicity in Properties

2

The formation of the oxide ion, O2-(g) from oxygen atom requires first an exothermic and then an endothermic step as shown below: O(g) + e- O-(g); H = -141 kJ mol-1 O-(g) + e- O2-(g); H = +780 kJ mol-1 Thus, process of formation of O2- in gas phase is unfavourable even though O2- is isoelectronic with neon. It is due to the fact that,

  1. O- ion has comparatively smaller size than oxygen atom
  2. oxygen is more electronegative
  3. addition of electron in oxygen results in larger size of the ion
  4. electron repulsion outweighs the stability gained by achieving noble gas configuration.
AIPMT 2015
3

The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase ?

  1. Ca2+ < K+ < Ar
  2. K+ < Ar < Ca2+
  3. Ar < K+ < Ca2+
  4. Ca2+ < Ar < K+
AIPMT 2015 (Cancelled)
4

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-
AIPMT 2014
5

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)
6

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)
7

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)
8

Which of the following oxide is amphoteric?

  1. SnO2
  2. CaO
  3. SiO2
  4. CO2
AIPMT 2011 (Mains)
9

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)
10

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

  1. CsI
  2. CsF
  3. LiF
  4. NaF
AIPMT 2010 (Mains)
11

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)

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