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Physics Chemistry Botany Zoology

Question bank:

The screening effect of d-electrons is :

Equal of the p-electrons
Much more than p-electrons
Same as f-electron
Less than p-electrons

Values of electronegativity like 3.0, 2.8, 2.5 are related to :-

Elements having high IP in periodic table
Elements having high EA in periodic table
Chalcogens
None of the above

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

EN = 1.6 - 2.2
EN =1.7 - 2.2
EN =0.8 - 1.1
EN =0 - 1.6

In scandium series, maximum distance between neutrons containing site and valence shell is of :-

Sc
Mn
Fe
Zn

Which of the following compound is isoelectronic with adduct of "Diborane and Ammonia" is :-

Hydrogen peroxide
Diborane (at absolute zero temp.)
First member of alkyne series
Diborance (at 10

°

C temp)

Which of the following ionisation energy order is NOT correct :-

Cu⁺ > Cu⁺²
Mn⁺² > Mn⁺³
N^-3 > N
All of the above

Which of the following would not proceed in the forward direction spontaneously?

{Si}^{+} + Cl \to Si + {Cl}^{+}

F + I^{-} \to F^{-} + I

both
none

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

Ca⁺², K⁺, Cl^-, S^-2
Cl^-, Ca⁺², K⁺, S^-2
S^-2, Cl^-, Ca⁺², k⁺
None of the above

In which of the following has maximum EN :-

C
O
B
F

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

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

Electronic configuration of Palladium is :-

[Rn] 5f³ 6d¹ 7s²
[Rn] 5f⁵ 6d¹ 7s²
[Rn] 5f²6d¹ 7s²
None of the above

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

Removal of 2^ndelectron is always :-

Endothermic
Endothermic for Mg, Be, N
Exothermic for Mg, Be, N and noble gases
Depends of electronic configuration

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