- 1(current)
Q. No.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: Â Electron Affinity (EA) |
 85%
Level 1: 80%+
Hints
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: Â Ionization Energy (IE) |Â Electron Affinity (EA) |
 75%
Level 2: 60%+
Hints
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: Â Ionization Energy (IE) |Â Electron Affinity (EA) |
 69%
Level 2: 60%+
Hints
The electronic configuration of some elements is given in Column-I and their electron gain enthalpies are given in Column-II. Match the electronic configuration with the electron gain enthalpy:
| Column-I (Electron configuration) |
Column-II (Electron gain enthalpy/ kJ mol¯1) |
||
| A. | \(1 s^2 2 s^2 2 p^6\) | (i) | \(-53\) |
| B. | \(1 s^2 2 s^2 2 p^6 3 s^1\) | (ii) | \(-328\) |
| C, | \(1 s^2 2 s^2 2 p^5 \) | (iii) | \(-141\) |
| D. | \( 1 s^2 2 s^2 2 p^4 \) | (iv) | \(+48\) |
| Options: | A | B | C | D |
| 1. | (iv) | (i) | (ii) | (iii) |
| 2. | (i) | (ii) | (iii) | (iv) |
| 3. | (i) | (iv) | (iii) | (ii) |
| 4. | (iv) | (i) | (iii) | (ii) |
Subtopic: Â Electron Affinity (EA) |
 74%
Level 2: 60%+
Hints
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Match the correct ionization enthalpies and electron gain enthalpies of the following elements.
|
Elements |
|
|
|
||
|
(i) |
Most reactive non-metal |
A. |
419 |
3051 |
-48 |
|
(ii) |
Most reactive metal |
B. |
1681 |
3374 |
-328 |
|
(iii) |
Least reactive element |
C. |
738 |
1451 |
-40 |
|
(iv) |
Metal forming binary halide |
D. |
2372 |
5251 |
+48 |
Codes
| A | B | C | D | |
| 1. | ii | i | iv | iii |
| 2. | i | ii | iii | iv |
| 3. | i | iv | iii | ii |
| 4. | iv | i | iii | ii |
Subtopic: Â Ionization Energy (IE) |Â Electron Affinity (EA) |
 67%
Level 2: 60%+
Hints
Given below are two statements:
| Assertion (A): | Electron gain enthalpy of oxygen is more than that of sulphur. |
| Reason (R): | Oxygen is more electronegative than sulphur. |
| 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 False but (R) is True. |
| 4. | Both (A) and (R) are False. |
Subtopic: Â Electronegativity |Â Electron Affinity (EA) |
Level 4: Below 35%
Hints
- 1(current)
Q. No.
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