Element of the third period that is expected to exhibit positive electron gain enthalpy is: 

1. Na 2. Al
3. Cl 4. Ar

Subtopic:  Electron Affinity (EA) |
 68%
From NCERT
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The pair that has both members from the same period of the Periodic Table is 

1. Cl, Br 2. Ca, Cl
3. Na, Ca 4. Na, Cl
Subtopic:  Electronic Configuration |
 74%
From NCERT
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Isoelectronic pair, among the following, is : 

1. ClO2-, ClF2+

2. IF2-, I3-

3. Cl2O, ICl2-

4. ICl2-, ClO2

Subtopic:  Atomic Size |
 69%
From NCERT
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The incorrect order of electronegativity is :

1. Cl > S > P > Si 2. Si > Al > Mg > Na
3. F > Cl > Br > I 4. None of the above.
Subtopic:  Electronegativity |
 63%
From NCERT
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The most non-metallic element among the given elements is

1. Be 2. B
3. Mg 4. Al
Subtopic:  Modern Periodic Table & Periodicity |
 75%
From NCERT
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For the second-period elements, the correct increasing order of first ionisation enthalpy is:

1. Li < Be < B < C < O < N < F < Ne
2. Li < Be < B < C < N < O < F < Ne
3. Li < B < Be < C < O < N < F < Ne
4. Li < B < Be < C < N < O < F < Ne
Subtopic:  Ionization Energy (IE) |
 75%
From NCERT
NEET - 2019
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A configuration with the lowest ionization enthalpy among the following is:
1. \(1 s^2 2 s^2 2 p^5\)\(1 s^2 2 s^2 2 p^5\)
2. \(1 s^2 2 s^2 2 p^3\)
3. \(1 s^2 2 s^2 2 p^6 3 s^1\)
4. \(1 s^2 2 s^2 2 p^6\)

Subtopic:  Ionization Energy (IE) |
 78%
From NCERT
AIPMT - 2007
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Among the following, the most characteristic oxidation states for lead and tin are, respectively:

1. +4, +2

2. +2, +4

3. +4, +4

4. +2, +2

Subtopic:  Electronic Configuration |
 63%
From NCERT
AIPMT - 2007
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The correct order of increasing electron affinity for the elements, O, S, F and Cl is:

1. Cl < F < O < S 2. O < S < F < Cl
3. F < S < O < Cl 4. S < O < Cl < F
Subtopic:  Electron Affinity (EA) |
 77%
From NCERT
AIPMT - 2010
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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 |
 88%
From NCERT
AIPMT - 2010
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