Classification Of Elements And Periodicity In Properties

Chemistry
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The order of first electron affinity of and is:

A
B
C
D
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Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in:

A
maximum covalency in compounds
B
forming polymeric hydrides
C
forming covalent halides
D
exhibiting amphoteric nature in their oxides
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The process(es) requiring the absorption of energy is(are) :

A
B
C
D
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Select equation(s) having endothermic step:

A
B
C
D
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Which among the following factors is the most important in making fluorine the strongest oxidising agent? 

A
Electron affinity
B
Ionisation enthalpy
C
Hydration enthalpy
D
Bond dissociation energy
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Statement-1 : Electron affinity of fluorine is less than that of chlorine.
Statement-2 : Chlorine can accommodate an electron by utilising its vacant 3d-orbital.

A
Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1
B
Statement-1 is True, Statement-2 is True; Statement-2 is not a correct explanation for Statement-1
C
Statement-1 is True, Statement-2 is False
D
Statement-1 is False, Statement-2 is True
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The electron gain enthalpies of halogens in kJ mol are as given as F = -332, Cl = -349, Br = -324, I = -295. The less negative value for F as compared to that of Cl is due to :

A
strong electron - electron repulsions in the compact 2p-sub shell of F
B
weak electron - electron repulsions in the bigger 3p-sub shell of Cl
C
smaller electronegativity value of F than Cl
D
both (A) and (B)
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Which of the following represent(s) the correct order of electron affinities ?

A
F > Cl > Br > I
B
C < N < Cl < F
C
N < C < O < F
D
C < Si > P > N
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