The lightest metal in the periodic table is:

1. H

2. Mg

3. Ca

4. Li

Subtopic:  Modern Periodic Table & Periodicity |
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The electronic configuration that represents the d-block element is: 

1. 1s2 2s2 2p6 3s23p63d10 4s24p6

2. 1s2 2s2 2p6 3s23p63d10 4s24p1

3. 1s2 2s2 2p6 3s23p63d10 4s2

4. 1s2 2s2 2p6 3s23p6 4s2

Subtopic:  Electronic Configuration |
 77%
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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%
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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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