Ionization Enthalpy NEET Questions

Inorganic Chemistry - Classification of Elements and Periodicity in Properties

Ionization Enthalpy MCQ Questions


13.
The phenomenon of decrease in ionization enthalpy down a group is mainly due to:
A.
Increase in nuclear charge
B.
Decrease in atomic radius
C.
Decrease in number of protons
D.
Increase in shielding effect and atomic radius
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ANSWER :
D. Increase in shielding effect and atomic radius
14.
Among the following, the element with highest first ionization enthalpy is:
A.
I
B.
Cl
C.
Br
D.
F
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ANSWER :
D. F
15.
The first ionization enthalpies of group 13 elements are: B (801) > Tl (589) > Ga (579) > Al (577) > In (558) kJ/mol. The deviation from regular trend is due to:
A.
Incorrect experimental values
B.
Decrease in number of valence electrons
C.
Increase in atomic mass
D.
Poor shielding by d and f electrons leading to higher effective nuclear charge in Ga, In, Tl
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ANSWER :
D. Poor shielding by d and f electrons leading to higher effective nuclear charge in Ga, In, Tl
16.
Which of the following factors does NOT affect the ionization enthalpy of an element?
A.
Size of the atom
B.
Atomic mass
C.
Penetration effect of electrons
D.
Nuclear charge
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ANSWER :
B. Atomic mass
17.
The ionization enthalpy of hydrogen is 1312 kJ/mol. This is approximately equal to:
A.
136 eV
B.
1.36 eV
C.
13.6 eV
D.
0.136 eV
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ANSWER :
C. 13.6 eV
18.
The shielding effect is most effective for:
A.
p-electrons
B.
f-electrons
C.
d-electrons
D.
s-electrons
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ANSWER :
D. s-electrons