Basic Concepts of Chemistry AFCAT Questions

AFCAT Chemistry

Basic Concepts of Chemistry MCQ Questions


13.
The atomic number of an element is equal to the number of:
A.
Neutrons in the nucleus
B.
Protons in the nucleus
C.
Protons and neutrons
D.
Electrons and neutrons
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ANSWER :
B. Protons in the nucleus
14.
The mass number of an atom is the sum of:
A.
Electrons and protons
B.
Protons and neutrons
C.
Electrons and neutrons
D.
Only protons
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ANSWER :
B. Protons and neutrons
15.
The number of neutrons in an atom can be calculated by:
A.
Mass number + Atomic number
B.
Atomic number - Mass number
C.
Mass number - Atomic number
D.
Atomic number / Mass number
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ANSWER :
C. Mass number - Atomic number
16.
How many neutrons are present in an atom of ³⁵Cl (Chlorine-35)?
A.
17
B.
18
C.
35
D.
52
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ANSWER :
B. 18
17.
The number of protons, neutrons, and electrons in ²³Na (Sodium-23) respectively are:
A.
11, 12, 11
B.
12, 11, 11
C.
11, 11, 12
D.
23, 11, 11
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ANSWER :
A. 11, 12, 11
18.
An atom of element X has 17 protons and 18 neutrons. Its mass number is:
A.
17
B.
18
C.
1
D.
35
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ANSWER :
D. 35