Group 13 to 18 Elements General Introduction(Electronic Configuration and General Trends in Physical and Chemical Properties...) NEET Questions

Inorganic Chemistry - P-Block Elements

Group 13 to 18 Elements General Introduction(Electronic Configuration and General Trends in Physical and Chemical Properties...) MCQ Questions


13.
Down a group, atomic radius increases because:
A.
Number of valence electrons decreases
B.
Effective nuclear charge increases
C.
New shells are added and shielding effect increases
D.
Nuclear charge decreases
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ANSWER :
C. New shells are added and shielding effect increases
14.
Which has the largest atomic radius?
A.
Li
B.
K
C.
Cs
D.
Na
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ANSWER :
C. Cs
15.
Among the second period elements, which has the smallest atomic radius?
A.
F
B.
C
C.
Be
D.
Li
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ANSWER :
A. F
16.
The first ionization enthalpy generally increases across a period because:
A.
Number of shells increases
B.
Effective nuclear charge increases
C.
Shielding effect increases
D.
Atomic size increases
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ANSWER :
B. Effective nuclear charge increases
17.
The order of first ionization enthalpy among second period elements is:
A.
Li < Be < B < C < N < O < F < Ne
B.
Li < B < Be < C < O < N < F < Ne
C.
Li < Be < B < C < O < N < F < Ne
D.
Ne < F < O < N < C < B < Be < Li
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ANSWER :
B. Li < B < Be < C < O < N < F < Ne
18.
Why is the first ionization enthalpy of nitrogen higher than oxygen?
A.
Nitrogen has higher nuclear charge
B.
Nitrogen has half-filled 2pĀ³ configuration which is extra stable
C.
Oxygen has more protons
D.
Nitrogen has smaller atomic size
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ANSWER :
B. Nitrogen has half-filled 2pĀ³ configuration which is extra stable