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) $↖43↙56{Ba}$
(b) $↖99↙43{Tc}$
(c) $↖99↙56{Ba}$
(d) $↖56↙43{Tc}$
The correct answers to the above question in:
Answer: (b)
Given mass number (Z) = 99
No. of neutrons = 56
∴ No. of protons = atomic number = 99 – 56 = 43
i.e., $↖56↙43{Tc}$
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Read more chemistry basic Based General Science Questions and Answers
Question : 1
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 : 2
Which of the following isotopes is used as the standard for atomic mass ?
a) 16O
b) 13C
c) 12C
d) 1H
Answer »Answer: (c)
Question : 3
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 : 4
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)
Question : 5
In an atom, the order of filling up of the orbitals is governed by
a) Heisenberg’s uncertainty principle
b) Hund’s rule
c) Aufbau’s principle
d) Pauli’s exclusion principle
Answer »Answer: (c)
Question : 6
Which of the following is not a subatomic particle?
a) Proton
b) Deuteron
c) Neutron
d) Electron
Answer »Answer: (b)
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