Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?

1. Cl> Br> F> I2

2. Br> I> F> Cl2

3. F> Cl> Br> I2

4. I> Br> Cl> F2

Subtopic:  Electron Affinity (EA) |
 54%
NEET - 2016
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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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A pair among the following that have the same size is:

1. Fe2+, Ni2+

2. Zr4+, Ti4+

3. Zr4+ , Hf4+

4. Zn2+, Hf4+

Subtopic:  Lanthanoid & Actinoids Contraction |
 80%
From NCERT
NEET - 2010
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Links
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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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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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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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The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH3 (1.5 D) is larger than that of NF3 (0.2 D). This is because:

(1) in NH3 as well as in NF3 the atomic dipole and bond dipole are in the same direction
(2) in NH3 the atomic dipole and bond dipole are in the same direction whereas in NFthese are in opposite directions
(3) in NH3 as well as NF3 the atomic dipole and bond dipole are in opposite directions
(4) in NH3 the atomic dipole and bond dipole are in the opposite directions whereas in NF3 these are in the same directions

Subtopic:  Polarity |
 82%
From NCERT
NEET - 2006
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Magnesium reacts with an element (X) to form an ionic compound.
If the ground state electronic configuration of (X) is 1s22s22p3,
the simplest formula for this compound is: 

1. Mg2X3

2. MgX2

3. Mg2X

4. Mg3X2

Subtopic:  Nature of Compound |
 74%
From NCERT
NEET - 2018
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