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) Proton
(b) Neutron
(c) Electron
(d) Photon
The correct answers to the above question in:
Answer: (d)
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Question : 2
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 : 3
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 : 4
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 : 5
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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