Increasing order of ionic radii and decreasing order of number of protons of the given isoelectronic species is:-
1. Ca+2, K+, Cl-, S-2
2. Cl-, Ca+2, K+, S-2
3. S-2, Cl-, Ca+2, K+
4. None of the above
The electronic configuration of Palladium is:
1. [Kr] 5f3 6d1 7s2
2. [Kr] 5f5 6d1 7s2
3. [Kr] 5f2 6d1 7s2
4. None of the above.
The element having very high electron affinity but zero ionisation enthalpy is:
1. He (due to inert gas configuration)
2. Be (due to fully filled subshell)
3. H (due to presence of allotropes)
4. None of the above
Allred Rochow's scale is related to:
1. Electronegativity, radius, and Z*
2. Resonance energy of the molecule, ionisation potential and electron affinity.
3. Bond Polarity, diagonal relationship and periodicity.
4. None of the above.
Element/Ion that has the highest electron affinity is :
1. | F- | 2. | O- |
3. | O | 4. | Na |
The correct order for electron affinity of halogens is :
1. Br > F
2. F > Cl
3. Br > Cl
4. F > I
Among the following species, the smallest ion is :
1. | Na+ | 2. | F- |
3. | O2- | 4. | N3- |
The electronic configuration of chalcogens in their outermost shell is :
1.
2.
3.
4.
The incorrect match among the following is:
1. B < C < N < O (increasing first ionisation enthalpy)
2. I < Br < F < Cl (increasing electron gain enthalpy)
3. Li < Na < K < Rb (increasing metallic radius)
4. Al3+ < Mg2+ < Na+ <F- (increasing ionic size)
The correct sequence of increasing radii is -
1. | Ar < K+ < Ca2+ | 2. | Ca2+ < Ar < K+ |
3. | Ca2+ < K+ < Ar | 4. | K+ < Ar < Ca2+ |