set 3 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on atomic structure, molecules and nuclear chemistry topic of general science mcq
(a) 16O
(b) 13C
(c) 12C
(d) 1H
The correct answers to the above question in:
Answer: (c)
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Read more chemistry basic Based General Science Questions and Answers
Question : 1
Which one among the following most correctly determines the atomic number of an element?
a) Number of ions
b) Number of protons and electrons
c) Number of protons
d) Number of nucleons
Answer »Answer: (c)
Question : 2
The number of electrons in an element with atomic number X and atomic mass Y will be
a) (Y – X)
b) (X + Y)
c) (X – Y)
d) X
Answer »Answer: (d)
No. of electrons = no. of protons = Atomic number = X
Question : 3
An oxide of nitrogen has molecular weight 30. What is the number of electrons in one molecule of the compound?
a) 22
b) 15
c) 14
d) 23
Answer »Answer: (a)
Question : 4
Which one of the following is not needed in a nuclear fission reactor?
a) Accelerator
b) Coolant
c) Moderator
d) Control device
Answer »Answer: (a)
Question : 5
Which of the following describes an isotope with a mass number of 99 that contains 56 neutrons in its nucleus ?
a) $↖43↙56{Ba}$
b) $↖99↙43{Tc}$
c) $↖99↙56{Ba}$
d) $↖56↙43{Tc}$
Answer »Answer: (b)
Given mass number (Z) = 99
No. of neutrons = 56
∴ No. of protons = atomic number = 99 – 56 = 43
i.e., $↖56↙43{Tc}$
Question : 6
The atomic weights are expressed in terms of atomic mass unit. Which one of the following is used as a standard?
a) 16O8
b) 12C6
c) 1H1
d) 35Cl17
Answer »Answer: (b)
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