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In which of the following has maximum EN :-

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Explanation

EN increase from left to right in P.T

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According to Gallis, Hanny and Smith, 50% covalent character in a molecule is related to:-

$∆$ EN=1.6-2.2

$∆$ DEN=1.7-2.2

$∆$ EN=0.8-1.1

$∆$ EN=0-1.6

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Explanation

Maximum IP $\to$ Noble gas

Max.EA $\to$ halongens

EN of Cl=3

EN of Br=2.8

en of I=2.5

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Allred Rochow scale is related to:-

Electronegativity, radius and Z*

resonance energy of molecule, Ionisation potential and electron affinity

Bond polarity, diagonal relationship and periodicity

None of the above

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Explanation

According to Gallis $∆ EN$ =1.7

According to Henny and Smith $∆ EN$ =2.1

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Electronic configuration of Palladium is :-

[Rn] 5f³ 6d¹ 7s²

[Rn] 5f⁵ 6d¹ 7s²

[Rn] 5f²6d¹ 7s²

None of the above

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Explanation

Pd₄₆ = [Kr]₃₆ 4d¹⁰

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Z_eff of Na⁺ and Na⁰ are respectively :-

1.95 and 1.22

0.85 and 0.35

1 and 0.35

6.85 and 2.2

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Explanation

apply slatter rule

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Removal of 2^ndelectron is always :-

Endothermic

Endothermic for Mg, Be, N

Exothermic for Mg, Be, N and noble gases

Depends of electronic configuration

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Explanation

removal of electron from cation is always endo thermic

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Actinide contraction is mainly related to :-

Poor shielding by 5f subshell

Extra ordinary decrement in Z_eff

Both of the above

Strong shielding by 5f subshell

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

111, 66, 77, 74, 88

74, 84, 111, 77,66

111, 88, 77, 74, 66

111, 66, 88, 77,74

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Explanation

radius decreases from left to right in P.T

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

Amphoteric elements

Four electron donor group

s-block

All of the above

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Explanation

IE $\propto O . S$

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A large difference between fifth and sixth ionisation energies indicate the element having :-

15 proton in nucleus

13 proton in nucleus

11 proton in nucleus

Ionisation energy is NOT related to number of proton in nucleus

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Explanation

group 15, has I.E₆ >>>>I.E₅

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