Q. No.The elements in which electrons are progressively
filled in 4f-orbitals are called:
1.
Actinoids
2.
Transition elements
3.
Lanthanoids
4.
Halogens
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 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 |
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. |
The order of screening effect of electrons of s, p, d and f orbitals of a given shell of an atom on electrons in its outer shell is :
1. s > p > d > f
2. f > d > p > s
3. p < d < f < s
4. f > p > s > d
If an atom has electronic configuration 1s22s22p63s23p63d34s2, we will place it in group number:
| 1. | Fifth | 2. | Fifteenth |
| 3. | Second | 4. | Third |
Among the following sequences, the sequence contains atomic numbers of only representative elements is/are-
| (a) | 3, 33, 53, 87 | (b) | 2, 10 ,22, 36 |
| (c) | 7, 17, 25, 37, 48 | (d) | 9, 35, 51, 88 |
Choose the correct option
| 1. | (a), (d) | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (b), (d) |
The term(s), that does not have a unit among the following, is/are-
(a) Electronegativity
(b) Electron gain enthalpy
(c) Ionization enthalpy
(d) Metallic character
Choose the correct option:
1. (a), (d)
2. (b), (c)
3. (c), (d)
4. (b), (d)
The element having a greatest difference between its first and second ionization energies, is:
1. Ca
2. Sc
3. K
4. Ba
| 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 |
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