Ionization Enthalpy NEET Questions

Inorganic Chemistry - Classification of Elements and Periodicity in Properties

Ionization Enthalpy MCQ Questions


7.
The ionization enthalpy generally _____ across a period and _____ down a group:
A.
Increases, decreases
B.
Decreases, decreases
C.
Increases, increases
D.
Decreases, increases
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ANSWER :
A. Increases, decreases
8.
The first ionization enthalpy of boron is less than that of beryllium because:
A.
Boron has smaller atomic size than beryllium
B.
The 2p electron of boron is more shielded and easier to remove than the 2s electron of beryllium
C.
Beryllium is a noble gas
D.
Boron has higher nuclear charge than beryllium
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ANSWER :
B. The 2p electron of boron is more shielded and easier to remove than the 2s electron of beryllium
9.
Which of the following has the lowest first ionization enthalpy?
A.
Lithium
B.
Sodium
C.
Cesium
D.
Potassium
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ANSWER :
C. Cesium
10.
The second ionization enthalpy of an element is always greater than the first because:
A.
Number of protons decreases
B.
Atomic radius increases after first ionization
C.
It is more difficult to remove an electron from a positively charged ion
D.
Effective nuclear charge decreases
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ANSWER :
C. It is more difficult to remove an electron from a positively charged ion
11.
The first ionization enthalpy of Mg is higher than that of Na, but the second ionization enthalpy of Na is much higher than that of Mg. This is because:
A.
Magnesium has fewer electrons than sodium
B.
After losing one electron, Na⁺ achieves stable noble gas configuration, making removal of second electron extremely difficult
C.
Sodium is more metallic than magnesium
D.
Mg has a larger atomic size than Na
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ANSWER :
B. After losing one electron, Na⁺ achieves stable noble gas configuration, making removal of second electron extremely difficult
12.
The element with the highest second ionization enthalpy is:
A.
Silicon
B.
Magnesium
C.
Aluminum
D.
Sodium
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ANSWER :
D. Sodium