Assertion: Electron gain enthalpy becomes less negative as we go down a group.

Reason: The size of the atom increases on going down the group and the added electron would be farther from the nucleus.

1. Both assertion and reason are true and the reason is the correct explanation of assertion.

2.  Both assertion and reason are true and the reason is not the correct explanation of assertion.

3. Assertion is true but the reason is false.

4. Assertion is false but the reason is true.

Subtopic:  Electron Affinity (EA) |
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Assertion (A) Boron has a smaller first ionisation enthalpy than beryllium.

Reason (R) The penetration of 2s electron to the nucleus is more than the 2p electron hence 2p electron is more shielded by the inner core of electrons than the 2s electrons.

1. Both assertion and reason are true and the reason is the correct explanation of assertion.

2. Both assertion and reason are true and the reason is not the correct explanation of assertion.

3. Assertion is true but the reason is false.

4. Assertion is false but the reason is true.

Subtopic:  Ionization Energy (IE) |
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Assertion (A) Generally, ionisation enthalpy increases from left to right in a period.

Reason (R) When successive electrons are added to the orbitals in the same principal quantum level, the shielding effect of inner core of electrons does not increase very much to compensate for the increased attraction of the electron to the nucleus.

1.  Both assertion and reason are true and the reason is the correct explanation of assertion.

2.  Both assertion and reason are true and reason is not the correct explanation of assertion.

3.  Assertion is true but the reason is false.

4.  Assertion is false but reason is true.

 

Subtopic:  Ionization Energy (IE) | Electron Affinity (EA) |
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Statement A: The elements Z = 117 belongs to chalcogen family and the electronic configuration would be [Rn] 5f146d107s27p4.
Statement B: The element with 
Z = 120 belongs to Group 2 (alkaline earth metals), and the electronic configuration would be [Uuo]8s2

The correct option is-

1. Statement A is correct, B is wrong.
2. Statement A is wrong, B is correct
3. Both A and B are wrong.
4. Both A and B are correct

Subtopic:  Modern Periodic Table & Periodicity |
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Correct statement(s) among the following are-

(a) Helium has the highest first ionisation enthalpy in the periodic table

(b) Chlorine has less negative electron gain enthalpy than fluorine

(c) Mercury and bromine are liquids at room temperature

(d) In any period, the atomic radius of alkali metal is the highest

Choose the correct option

1. (a), (c), (d)

2. (a), (b), (c)

3. (a), (c),

4. (a), (d)

Subtopic:  Ionization Energy (IE) | Electron Affinity (EA) |
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The correct order of ionization energy of W, X,Y and Z is -

1. W >X> Y> Z

2. W <X < Y> Z

3. W <X> Y< Z

4. W >X> Y< Z

Subtopic:  Ionization Energy (IE) |
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Consider the following curve:

   
X represents group with highest atomic radius. The element that belongs to Y group can be : 

1. Na

2. Mg

3. Br

4. Si

Subtopic:  Atomic Size |
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The electronic configuration of four elements are :
(I) [Kr]5s1
(II) [Rn]5f146d17s2
(III) [Ar]3d104s24p5
(IV) [Ar]3d64s2

Consider the following statements :
(i) I Shows variable oxidation state
(ii) II is a d-block element
(iii) The compound formed between I and III is covalent
(iv) IV shows single oxidation state

Which statement is True (T) or False (F)?
1. FTFF
2. FTFT
3. FFTF
4. FFFF

Subtopic:  Nature of Compound | Electronic Configuration |
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In the following graph of variation of ionization energy with atomic number, X, Y, and Z represent elements.

 

The group number of X, Y, and Z elements is:

1. 1st group

2. 15th group

3. 17th group

4. 18th group

Subtopic:  Ionization Energy (IE) |
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The graph between ionization energy and atomic number for the first group elements is shown below

    


The element represented by Y in the graph above is -

1. Cs 

2. Rb

3. Ca

4.  K 

Subtopic:  Ionization Energy (IE) |
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