The most common oxidation state of cerium (Ce) is:

1. +5, +3

2. +5, +4

3. +3, +4

4. +3, +5

Subtopic:  Electronic Configuration |
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Which of the electronic configuration of an atom has the lowest ionization enthalpy? 

1. 1s2,2s22p5

2. 1s2,2s22p3

3. 1s2,2s22p6,3s1

4. 1s2,2s22p6

Subtopic:  Ionization Energy (IE) |
 79%
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The difference between ions and atoms is of:

1. relative size

2. Configuration

3. presence of charge

4. All of these

Subtopic:  Modern Periodic Table & Periodicity |
 87%
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The expected trend of change in atomic radius down the group is:

1. Continuous decrease

2. Continuous increase

3. Periodic one, an increase followed by a decrease

4. Periodic one, a decrease followed by an increase

Subtopic:  Atomic Size |
 86%
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An element R forms the highest oxide R2O5. R belongs to:

1. 13th  group

2. 15th group

3. 16 th group

4. 2nd group

Subtopic:  Nature of Compound |
 73%
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Amongst the following electronic configurations, the highest ionization energy
is represented by:

1. [Ne]3s23p3

2. [Ne]3s23p2

3. [Ar]3d104s24p3

4. [Ne]3s23p1

Subtopic:  Ionization Energy (IE) |
 68%
From NCERT
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Which pair of elements is chemically most similar?

1. Na, Al

2. Cu, S

3. Ti, Zr

4. Zr, Hf

Subtopic:  Nature of Compound |
 73%
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Lanthanoid contraction is caused due to :

1. the appreciable shielding on outer electrons by 4f electrons from the nuclear charge

2. the appreciable shielding on outer electrons by 5d electrons from the nuclear charge

3. the same effective nuclear charge from Ce to Lu

4. the imperfect shielding on outer electrons by 4f electrons from the nuclear charge

Subtopic:  Lanthanoid & Actinoids Contraction |
 66%
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In the transition elements, the incoming electron occupies (n-1)d sublevel in preference to:

1. np

2. ns

3. (n-1)d

4. (n+1)s

Subtopic:  Electronic Configuration |
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The electronegativity of elements from group 1 to group 17 :

1. Decreases

2. Increases

3. Remains constant

4. All of the above

Subtopic:  Screening Effect |
 84%
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