The correct sequence of increasing radii is - 

1. Ar < K+ < Ca2+ 2. Ca2+ < Ar < K+
3. Ca2+ < K+ < Ar 4. K< Ar < Ca2+

Subtopic:  Atomic Size |
 84%
From NCERT
NEET - 2015
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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); fH° = -141kJmol-1
O-(g) +e-           O2-(g); fH° = +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. electron repulsion outweighs the stability gained by achieving noble gas configuration

2. O- ion has comparatively smaller size than oxygen atom

3. Oxygen is more electronegative

4. addition of electron in oxygen result in large size of the ion

Subtopic:  Electron Affinity (EA) |
 70%
NEET - 2015
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Be2+ is isoelectronic with which of the following ions?

1. H+

2. Li+

3. Na+

4. Mg2+

Subtopic:  Electronic Configuration |
 89%
From NCERT
NEET - 2014
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The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resins

follows the order

1. Li+<K+<Na+<Rb+

2. Rb+<K+<Na+<Li+

3. K+<Na+<Rb+<Li+

4. Na+<Li+<K+<Rb+

Subtopic:  Atomic Size |
 65%
NEET - 2012
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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-

Subtopic:  Atomic Size |
 84%
From NCERT
NEET - 2010
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The correct order of increasing electron gain enthalpy with a negative sign for the elements O, S, F, and Cl is : 

1. Cl < F < S < O                   

2. O < S < F < Cl

3. F < S < O < Cl                   

4. S < O < Cl < F

Subtopic:  Electron Affinity (EA) |
From NCERT
NEET - 2010
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Which one of the following compounds is a peroxide ?

1. KO2

2. BaO2

3. MnO2

4. NO2

Subtopic:  Modern Periodic Table & Periodicity |
 52%
NEET - 2010
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The sequence of ionic mobility in aqueous solution is

(1) K+>Na+>Rb+>Cs+

(2) Cs+>Rb+>K+>Na+

(3) Rb+>K+>Cs+>Na+

(4) Na+>K+>Rb+>Cs+

Subtopic:  Atomic Size |
 65%
NEET - 2008
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Which one of the following arrangements does not give the correct picture of the trends indicated against it?

(1) F> Cl> Br> I:Oxidising power

(2) F2 < Cl2 > Br2 > I: Electron gain enthalpy

(3) F> Cl> Br> I: Bond dissociation energy

(4) F> Cl> Br> I2: Electronegativity

Subtopic:  Ionization Energy (IE) |
 70%
NEET - 2008
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Identify the correct order of the size of the following:

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

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

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

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

Subtopic:  Atomic Size |
 86%
From NCERT
NEET - 2007
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