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 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 increasing order of non-metallic character of the elements N, P, O, and S is:
1. P < S < N < O
2. O < S < N < P
3. O < N < S < P
4. N < S < O < P
The most non-metallic element among the given elements is
1. | Be | 2. | B |
3. | Mg | 4. | Al |
Boron has lesser ionization enthalpy than Beryllium, because:
1. | It is easier to remove electrons from p - a subshell than a filled s - subshell. |
2. | The s-electron can be removed easier than the p-electron. |
3. | Ionization enthalpy decreases with an increase in atomic number. |
4. | Ionization enthalpy increases along the period. |
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
The first ionisation enthalpies of Na, Mg, Al, and Si are in the order of:
1. Na < Al < Mg < Si
2. Na > Mg > Al > Si
3. Na < Mg < Al < Si
4. Na > Mg > Al < Si
Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy) is:
1. | F > Cl > Br > I | 2. | F < Cl < Br < I |
3. | F < Cl > Br > I | 4. | F < Cl < Br > I |
The correct order of size of the given species is:
1. | I > I– > I+ | 2. | I+ > I– > I |
3. | I > I+ > I– | 4. | I– > I > I+ |