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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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 |
 82%
From NCERT
AIPMT - 2007
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Which one of the following orders is not in accordance with the property stated against?

1. F2>Cl2>Br2>I2 : Oxidising power

2. Hl>HBr>HCl>HF : Acidic property in water

3. F2>Cl2>Br2>I2 : Electronegativity

4. F2>Cl2>Br2>I2 : Bond dissociation energy

Subtopic:  Ionization Energy (IE) | Electronegativity |
 76%
From NCERT
AIPMT - 2006
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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) |
 74%
From NCERT
NEET - 2019
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Read the following statements (S) and Explanation (E). Choose the correct answers from the codes (1), (2), (3) and (4):

S : Sulphate is estimated as BaSO4 and not as MgSO4.

E : Ionic radius of Mg2+ is smaller than Ba2+.

1.  S is correct but E is wrong
2.  S is wrong but E is correct
3.  Both S and E are correct and E is correct explanation of S
4.  Both S and E are correct but E is not correct explanation of S

Subtopic:  Atomic Size |
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 |
 64%
From NCERT
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The correct order of decreasing second ionization enthalpy of Ti(22), V(23), Cr (24) and Mn(25) is:

1. Cr > Mn > V > Ti

2. V > Mn > Cr > Ti

3. Mn > Cr > Ti > V

4. Ti > V > Cr > Mn

Subtopic:  Ionization Energy (IE) |
 60%
From NCERT
AIPMT - 2008
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Be2+ is isoelectronic with which of the following ions?
1. H+
2. Li+
3. Na+
4. Mg2+

Subtopic:  Electronic Configuration |
 91%
From NCERT
AIPMT - 2014
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The correct order of ionic radii is:

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

Subtopic:  Atomic Size |
 80%
From NCERT
AIPMT - 2014
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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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