If atomic number of an element of He-family is Z then which of the following atomic number will highest EA?

(1) Z - 2

(2) Z - 1

(3) Z + 1

(4) Z + 2

Subtopic:   Evolution of Periodic Table |
 65%
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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 fully filled subshell)

3. H (due to presence of allotropes)

4. None of the above

Subtopic:  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

Subtopic:  Electron Affinity (EA) |
 71%
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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

Subtopic:  Atomic Size |
 63%
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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

Subtopic:  Ionization Energy (IE) |
 56%
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The first four IP values of an element are 19, 190, 2000 and 2600 eV/atom. Element belongs to:-

(1) Amphoteric elements

(2) Four electron donor group

(3) s-block

(4) All of the above

Subtopic:  Ionization Energy (IE) |
 63%
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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

Subtopic:  Atomic Size |
 70%
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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

Subtopic:  Ionization Energy (IE) |
 65%
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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

Subtopic:  Screening Effect |
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The electronic configuration of Palladium is:

1. [Rn] 5f3 6d1 7s2

2. [Rn] 5f5 6d1 7s2

3. [Rn] 5f6d1 7s2

4. None of the above.

Subtopic:  Modern Periodic Table & Periodicity | Electronic Configuration |
 61%
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