set 1 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) Ba
(b) Be
(c) B
(d) Bi
The correct answers to the above question in:
Answer: (a)
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Question : 1
The molecular formula P2O5 means that
a) the ratio of the mass of P to the mass of O in the molecule is 2:5
b) there are twice as many P atoms in the molecule as there are O atoms
c) a molecule contains 2 atoms of P and 5 atoms of O
d) the ratio of the mass of P to the mass of O in the molecule is 5 : 2
Answer »Answer: (c)
Question : 2
Which of the following pairs is/are correctly matched?
- Isotopes : Atoms with same atomic number but different atomic mass
- Isobars : Atoms with same number of neutrons but different atomic number
- Isotones : Atoms with same mass number but different atomic number
a) 1 and 2 only
b) 1 only
c) 1, 2 and 3
d) 2 only
Answer »Answer: (b)
Question : 3
The number of molecules in one mole of a gas is
a) 6.023 × 1021
b) 6.023 × 1022
c) 6.023 × 1023
d) 6.023 × 1020
Answer »Answer: (c)
Question : 4
Which of the following is not a part of an atom?
a) Proton
b) Neutron
c) Electron
d) Photon
Answer »Answer: (d)
Question : 5
What is the mass number of an element, the atom of which contains two protons, two neutrons and two electrons?
a) 4
b) 6
c) 2
d) 8
Answer »Answer: (a)
Question : 6
The nucleus of a singly ionized carbon atom contains
a) 6 protons, 6 neutrons and 6 electrons
b) 5 protons and 6 neutrons
c) 6 protons and 6 neutrons
d) 12 protons, 6 neutrons and 6 electrons
Answer »Answer: (c)
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