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
- 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)
The correct answers to the above question in:
Answer: (d)
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Read more chemistry basic Based General Science Questions and Answers
Question : 1
Radioactivity is measured by
a) Geiger Counter
b) Seismometer
c) Hydrometer
d) Ammeter
Answer »Answer: (a)
Question : 2
The formation of SO2 and SO3 explain
a) the law of multiple proportions
b) the law of definite properties
c) the law of conservation of mass
d) Boyle’s law
Answer »Answer: (a)
In the same weight of SO2 and SO3 weight of oxygen is in the simple ratio of 2 : 3
Question : 4
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 : 5
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 : 6
An oxide of nitrogen has molecular weight 30. What is the number of electrons in one molecule of the compound?
a) 22
b) 15
c) 14
d) 23
Answer »Answer: (a)
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