Element of the third period that is expected to exhibit positive electron gain enthalpy is:
1. | Na | 2. | Al |
3. | Cl | 4. | Ar |
The most non-metallic element among the given elements is
1. | Be | 2. | B |
3. | Mg | 4. | Al |
For the second-period elements, the correct increasing order of first ionisation enthalpy is:
1. | Li < Be < B < C < O < N < F < Ne |
2. | Li < Be < B < C < N < O < F < Ne |
3. | Li < B < Be < C < O < N < F < Ne |
4. | Li < B < Be < C < N < O < F < Ne |
A configuration with the lowest ionization enthalpy among the following is:
1. \(1 s^2 2 s^2 2 p^5\)
2. \(1 s^2 2 s^2 2 p^3\)
3. \(1 s^2 2 s^2 2 p^6 3 s^1\)
4. \(1 s^2 2 s^2 2 p^6\)
The correct order of the decreasing ionic radii among the following isoelectronic species is:
1.
2.
3.
4.
The correct order of ionic radii is:
1.
2.
3.
4.
Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is , the simplest formula for this compound is:
1.
2.
3.
4.
The group of metals having the positive value of electron gain enthalpy is:
1. | Cr, Fe | 2. | Mn, Zn |
3. | Fe, Zn | 4. | Cr, Mn |
The correctly matched option is:-
1. : Order of atomic radius
2. O > C > B > N : Order of ionisation energy
3. : Increasing order of Zeff
4. O < N < F < Ne : Order of electron affinity
In alkaline earth metals, the properties, from the following, that will increase from Be to Ba are-
(i) Atomic radius
(ii) Ionisation energy
(iii) Nuclear charge
1. | (i) and (ii) | 2. | (i) and (iii) |
3. | (ii) and (iii) | 4. | (i), (ii), and (iii) |