The most non-metallic element among the given elements is
1. | Be | 2. | B |
3. | Mg | 4. | Al |
The pair that has both members from the same period of the Periodic Table is
1. | Cl, Br | 2. | Ca, Cl |
3. | Na, Ca | 4. | Na, Cl |
Element of the third period that is expected to exhibit positive electron gain enthalpy is:
1. | Na | 2. | Al |
3. | Cl | 4. | Ar |
The total number of 3rd period elements with more than one electron in a 3d orbital is:
1. | 9 | 2. | 11 |
3. | 0 | 4. | 8 |
The group of metals having positive value of electron gain enthalpy is :-
1. | Cr, Fe | 2. | Mn, Zn |
3. | Fe, Zn | 4. | Cr, Mn |
Percentage ionic character, if electronegativity value of X=2.1 & Y=3.0, is :-
1. | 20 | 2. | 30 |
3. | 17 | 4. | 23 |
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
The incorrect order of electronegativity is :
1. | Cl > S > P > Si | 2. | Si > Al > Mg > Na |
3. | F > Cl > Br > I | 4. | None of the above. |
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