Increasing order of the ionic radii and decreasing order of number of protons of the given isoelectronic species is :-

(1) Ca+2, K+, Cl-, S-2

(2) Cl-, Ca+2, K+, S-2

(3) S-2, Cl-, Ca+2, k+

(4) None of the above

Concept Questions :-

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In which of the following has maximum EN :-

(1) C

(2) O

(3) B

(4) F

Concept Questions :-

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

(1)EN=1.6-2.2

(2)DEN=1.7-2.2

(3)EN=0.8-1.1

(4)EN=0-1.6

 

Concept Questions :-

Electronegativity
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Allred Rochow scale is related to:-

(1) Electronegativity, radius and Z*

(2) resonance energy of molecule, Ionisation potential and electron affinity

(3) Bond polarity, diagonal relationship and periodicity

(4) None of the above

Concept Questions :-

Electronegativity
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Electronic configuration of Palladium is :-

(1) [Rn] 5f3 6d1 7s2

(2) [Rn] 5f5 6d1 7s2

(3) [Rn] 5f6d1 7s2

(4) None of the above

Concept Questions :-

Electronic Configuration
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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

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

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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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