Zeff of Na+ and Na0 are respectively :-

(1) 1.95 and 1.22

(2) 0.85 and 0.35

(3) 1 and 0.35

(4) 6.85 and 2.2

Concept Questions :-

Screening Effect
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Removal of 2nd electron is always :-

(1) Endothermic

(2) Endothermic for Mg, Be, N

(3) Exothermic for Mg, Be, N and noble gases

(4) Depends of electronic configuration

Concept Questions :-

Ionization Energy (IE)
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Actinide contraction is mainly related to :-

(1) Poor shielding by 5f subshell

(2) Extra ordinary decrement in Zeff

(3) Both of the above

(4) Strong shielding by 5f subshell

Concept Questions :-

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Atomic radius of Be, O, C, N, B are respectively (in pm) :-

(1) 111, 66, 77, 74, 88

(2) 74, 84, 111, 77,66

(3) 111, 88, 77, 74, 66

(4) 111, 66, 88, 77,74

Concept Questions :-

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First four IP values of an element are 19, 190, 230 and 260 eV/atom. Element belongs to:-

(1) Amphoteric elements

(2) Four electron donor group

(3) s-block

(4) All of the above

Concept Questions :-

Ionization Energy (IE)
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A large difference between fifth and sixth ionisation energies indicate the element having :-

(1) 15 proton in nucleus

(2) 13 proton in nucleus

(3) 11 proton in nucleus

(4) Ionisation energy is NOT related to number of proton in nucleus

Concept Questions :-

Ionization Energy (IE)
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If atomic number of an element of He-family is Z then which of the following atomic number will highest IP?

(1) Z - 2

(2) Z - 1

(3) Z + 1

(4) Z + 2

Concept Questions :-

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The element having very high electron affinity but zero ionisation enthalpy is :-

1. He (due to inert gas configuration)

2. Be (due to full filled subshell)

3. H (due to presence of allotropes)

4. None of the above

Concept Questions :-

Ionization Energy (IE)
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The pair of which addition of 2nd electron in both the atoms are endothermic :-

(1) N, Ne

(2) Be, F

(3) B, C

(4) All of the above

Concept Questions :-

Electron Affinity (EA)
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The correct order in which the O-O bond

length increases in the following is

1. H2O2<O2<O3

2. O3<H2O2<O2

3. O2<O3<H2O2

4. O2<H2O2<O3

Concept Questions :-

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