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651.

in a period from Li to F, ionisation potentialA. IncreasesB. DecreasesC. Remain sameD. None of the above

Answer» Correct Answer - A
Increases as the atomic size decreases and hence effective nuclear charge increases.
Discussion
652.

The set representing the correct order of the first ionisation potential isA. `KgtNagtLi`B. `BegtMggtCa`C. `BgtCgtN`D. `GegtSigtC`

Answer» Correct Answer - B
`1^(st)` I.P. decreases down the group.
Discussion
653.

which of the following has the least ionisation potential?A. LiB. CsC. ClD. I

Answer» Correct Answer - B
Li and Cs belong to `I^(st)` group but Cs has larger size, hence low nuclear attraction force, thus low ionisation energy.
Discussion
654.

The electronic configuration of the element with maximum electron affinity isA. `1s^(2),2s^(2),2p^(3)`B. `1s^(2),2s^(2),2p^(5)`C. `1s^(2),2s^(2),2p^(6),3s^(2),3p^(5)`D. `1s^(2),2s^(2),2p^(6),3s^(2),3p^(3)`

Answer» Correct Answer - C
As we know chlorine has the highest electron affinity and option (c ) represents the configuration of chlorine.
Discussion
655.

The first ionisation potential in electron volts of nitrogen and oxygen atoms are respectively given byA. 14.6, 13.6B. 13.6, 14.6C. 13.6, 13.6D. 14.6, 14.6

Answer» Correct Answer - A
Ionization potential of nitrogen is more that of oxygen. This is because nitrogen has more stable half-filled p-orbitals.
Discussion
656.

The ionisation potential of hydrogen from ground state to the first excited state isA. `-13.6 eV`B. 13.6 eVC. `-3.4 eV`D. 3.4 eV

Answer» Correct Answer - B
The `1^(st)` I.P. for hydrogen is 13.6 eV.
Discussion
657.

Highest energy will be absorbed to eject out the electron in the configurationA. `1s^(2)2s^(2)2p^(1)`B. 1s^(2)2s^(2)2p^(3)`C. `1s^(2)2s^(2)2p^(2)`D. `1s^(2)2s^(2)2p^(4)`

Answer» Correct Answer - B
Due to high stability of half-filled orbitals.
Discussion
658.

The element with highest ionization potential isA. BoronB. CarbonC. NitrogenD. Oxygen

Answer» Correct Answer - C
Amongst B, C, N and O, N has the highest first ionization energy, because of its half filled 2p orbital which is more stable.
Discussion
659.

Ionisation potential is lowest forA. HalogensB. Inert gasesC. Alkaline earth metalsD. Alkali metals

Answer» Correct Answer - D
Alkali metals, lower the no. of valence `e^(-)`, lower is the value of ionisation potential.
Discussion
660.

In which of the following process highest energy is absorbed?A. `Cu rarrCu^(+)`B. `Br rarrBr^(-)`C. `IrarrI^(-)`D. `LirarrLi^(+)`

Answer» Correct Answer - A
In Cu it has completely filled d-orbital so highest energy is absorbed when it convert in `Cu^(+)` ion.
Discussion
661.

The formation of the oxide ion `O_((g))^(2-)` requires first an exothermic and then an endothermic step as shown below. `O_((g)) +e^(-) = O_((g))^(-) DeltaH^(@) =- 142 kJ mol^(-1)` `O_((g))^(-) + e^(-) = O_((g))^(2-) DeltaH^(@) = 844 kJ mol^(-1)` This is because of :A. `O^(-)` ion will tend to resist the addition of another electronB. Oxgyen has high electron affinityC. Oxygen is more electronegativeD. `O^(-)` ion has comparatively larger size than oxygen atom

Answer» Correct Answer - A
The addition of second electron in an atom or ion is always endothermic.
Discussion