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 electron gain enthalpy.
Column I (Electron configuration) |
Column II (Electron gain enthalpy/kJ mol–1) |
||
A. | 1. |
–53 |
|
B. | 2. |
–328 |
|
C. | 3. |
–141 |
|
D. | 4. |
+48 |
Codes:
Options: | A | B | C | D |
1. | 4 | 1 | 2 | 3 |
2. | 1 | 2 | 3 | 5 |
3. | 1 | 4 | 3 | 2 |
4. | 4 | 1 | 3 | 2 |
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. |
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. |
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. |
Amongst the following elements whose electronic configuration are given below, the one having the highest ionisation enthalpy is:
1. | 2. | ||
3. | 4. |
Amongst the following elements whose electronic configuration are given below, the one having the highest ionisation enthalpy is:
1.
2.
3.
4.
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 |
Match the correct atomic radius with the corresponding element.
Element |
Atomic radius (pm) |
||
A. |
Be |
i. |
74 |
B. |
C |
ii. |
85 |
C. |
O |
iii. |
112 |
D. |
B |
iv. |
77 |
E. |
N |
v. |
66 |
Codes :
Options: | A | B | C | D | E |
1. | i | ii | iii | iv | v |
2. | iii | iv | v | ii | i |
3. | iv | ii | iii | i | v |
4. | v | ii | i | iii | iv |
Electronic configuration of four elements A, B, C and D are given below :
A.
B.
C.
D.
The correct order of increasing tendency to gain electron is :
1. | A < C < B < D | 2. | A < B < C < D |
3. | D < B < C < A | 4. | D < A < B < C |
The elements with atomic numbers 35, 53, and 85 are:
1. | Noble gases | 2. | Halogens |
3. | Heavy metals | 4. | Light metals |