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) 22
(b) 15
(c) 14
(d) 23
The correct answers to the above question in:
Answer: (a)
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Question : 1
In a chemical change the total weight of the reacting substances compared to total weight of products is
a) always less
b) always more
c) never the same
d) always the same
Answer »Answer: (d)
Law of conservation of mass.
Question : 2
What is the weight of one atom of Hydrogen in grams?
a) 6.62 × 10–24
b) 1.66 × 10–24
c) 6.023 × 10–23
d) None of these
Answer »Answer: (b)
Question : 3
Dalton's atomic theory successfully explained
- Law of conservation of mass
- Law of constant composition
- Law of radioactivity
- Law of multiple proportions
a) (i), (iii) and (iv)
b) (ii), (iii) and (iv)
c) (i), (ii) and (iii)
d) (i), (ii) and (iv)
Answer »Answer: (d)
Question : 4
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 : 5
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 : 6
Which of the following isotopes is used as the standard for atomic mass ?
a) 16O
b) 13C
c) 12C
d) 1H
Answer »Answer: (c)
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