Ionization Enthalpy NEET Questions

Inorganic Chemistry - Classification of Elements and Periodicity in Properties

Ionization Enthalpy MCQ Questions


1.
The ionization enthalpy of an element is defined as the energy required to:
A.
Add an electron to a neutral gaseous atom in its ground state
B.
Remove the most loosely bound electron from an isolated gaseous atom in its ground state
C.
Remove an electron from a solid metal surface
D.
Remove an electron from a gaseous molecule
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ANSWER :
B. Remove the most loosely bound electron from an isolated gaseous atom in its ground state
2.
Which of the following has the highest first ionization enthalpy?
A.
Helium (He)
B.
Hydrogen (H)
C.
Sodium (Na)
D.
Lithium (Li)
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ANSWER :
A. Helium (He)
3.
The first ionization enthalpy of nitrogen is greater than that of oxygen because:
A.
Nitrogen atom is larger than oxygen atom
B.
Oxygen has higher nuclear charge than nitrogen
C.
Oxygen has more electrons than nitrogen
D.
Nitrogen has half-filled 2p³ configuration which is extra stable
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ANSWER :
D. Nitrogen has half-filled 2p³ configuration which is extra stable
4.
The correct order of first ionization enthalpy among the following elements is:
A.
Be < B < N < C < O
B.
Be < B < C < O < N
C.
B < Be < C < O < N
D.
B < Be < C < N < O
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ANSWER :
C. B < Be < C < O < N
5.
The unit of ionization enthalpy is:
A.
J/atom
B.
kJ/g
C.
kJ mol⁻¹
D.
eV/g
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ANSWER :
C. kJ mol⁻¹
6.
Which of the following statements about successive ionization enthalpies is correct?
A.
ΔiH₁ = ΔiH₂ = ΔiH₃
B.
ΔiH₁ > ΔiH₂ > ΔiH₃
C.
ΔiH₂ < ΔiH₁ < ΔiH₃
D.
ΔiH₁ < ΔiH₂ < ΔiH₃
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ANSWER :
D. ΔiH₁ < ΔiH₂ < ΔiH₃