Basic Concepts of Chemistry AFCAT Questions

AFCAT Chemistry

Basic Concepts of Chemistry MCQ Questions


7.
The mass of a neutron is approximately:
A.
1.6749 × 10^-27 kg
B.
9.109 × 10^-31 kg
C.
1.6022 × 10^-19 kg
D.
1.6726 × 10^-24 kg
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ANSWER :
A. 1.6749 × 10^-27 kg
8.
The charge on a proton is:
A.
-1.602 × 10^-19 C
B.
+1.602 × 10^-19 C
C.
Zero
D.
+3.204 × 10^-19 C
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ANSWER :
B. +1.602 × 10^-19 C
9.
Thomson's model of an atom is also known as:
A.
Solar system model
B.
Plum pudding model
C.
Nuclear model
D.
Quantum model
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ANSWER :
B. Plum pudding model
10.
Rutherford's alpha-particle scattering experiment was performed using a thin foil of:
A.
Silver
B.
Aluminium
C.
Gold
D.
Copper
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ANSWER :
C. Gold
11.
The major conclusion drawn from Rutherford's gold foil experiment was that:
A.
Atoms are indivisible
B.
Most of the atom is empty space with a dense positive nucleus
C.
Electrons revolve in fixed orbits
D.
Atoms contain neutrons
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ANSWER :
B. Most of the atom is empty space with a dense positive nucleus
12.
Which of the following is a major drawback of Rutherford's atomic model?
A.
It could not explain the stability of the atom
B.
It did not propose a nucleus
C.
It assumed atoms were indivisible
D.
It ignored the existence of electrons
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ANSWER :
A. It could not explain the stability of the atom