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) 6.023 × 1021
(b) 6.023 × 1022
(c) 6.023 × 1023
(d) 6.023 × 1020
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 of the following have equal number of neutrons and protons?
a) Deuterium
b) Fluorine
c) Hydrogen
d) Chlorine
Answer »Answer: (a)
In 1H2 – no. of p = 1 and no. of n = 2 – 1 = 1
Question : 2
Adding electrons to an atom will result in a (an)
a) anion
b) cation
c) molecule
d) salt
Answer »Answer: (a)
e.g., Cl + e- ⟶ Cl- (anion)
Question : 3
Which of the following statements is incorrect for cathode rays?
a) Their nature depends upon the nature of gas present in the discharge tube.
b) They cost shadow of solid objects placed in their path
c) They move in straight line
d) They get deflected towards positive charge.
Answer »Answer: (a)
Question : 4
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 : 5
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)
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