Given below are two statements: 

Assertion (A): Electron gain enthalpy becomes less negative as we go down a group.
Reason (R): The size of the atom increases on going down the group and the added electron would be farther from the nucleus.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Electron Affinity (EA) |
 85%
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Given below are two statements: 

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 (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Ionization Energy (IE) |
 75%
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Given below are two statements: 

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 (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Ionization Energy (IE) | Electron Affinity (EA) |
 74%
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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 |
 64%
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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) |
 67%
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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) |
 66%
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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 |
 50%
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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) |
 58%
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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) |
 85%
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