Electron Gain Enthalpy NEET Questions

Inorganic Chemistry - Classification of Elements and Periodicity in Properties

Electron Gain Enthalpy MCQ Questions


7.
Electron gain enthalpy provides a measure of:
A.
The ease with which an atom can add an electron to form an anion
B.
The size of an atom
C.
The ease with which an atom loses an electron
D.
The mass of an atom
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ANSWER :
A. The ease with which an atom can add an electron to form an anion
8.
Electron gain enthalpy is related to but not the same as:
A.
Bond enthalpy
B.
Hydration enthalpy
C.
Ionization energy (same magnitude, same sign)
D.
Electron affinity (which has opposite sign and is defined at 0 K)
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ANSWER :
D. Electron affinity (which has opposite sign and is defined at 0 K)
9.
The relation between electron gain enthalpy ΔegH and electron affinity Ae is:
A.
ΔegH = Ae²
B.
ΔegH = +Ae
C.
ΔegH = -Ae - (5/2)RT
D.
ΔegH = Ae × T
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ANSWER :
C. ΔegH = -Ae - (5/2)RT
10.
The second electron gain enthalpy of an element is generally:
A.
Zero
B.
Positive (energy must be supplied to add a second electron)
C.
Negative
D.
Always smaller in magnitude than the first
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ANSWER :
B. Positive (energy must be supplied to add a second electron)
11.
The second electron gain enthalpy of oxygen is positive because:
A.
Oxygen has high electronegativity
B.
Oxygen is a non-metal
C.
Oxygen has a small size
D.
Adding a second electron to O⁻ (already negative) requires energy to overcome electrostatic repulsion
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ANSWER :
D. Adding a second electron to O⁻ (already negative) requires energy to overcome electrostatic repulsion
12.
The formation of O²⁻ from O atom is overall:
A.
Exothermic
B.
Endothermic (positive overall enthalpy change)
C.
Energy-neutral
D.
Spontaneous in gas phase
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ANSWER :
B. Endothermic (positive overall enthalpy change)