1099+ Important Chemistry MCQ Questions Answers

Q:

The complexity and variety of organic molecules is due to

A) their interaction with water	B) their tremendously large sizes
C) the chemical versatility of carbon atoms	D) the variety of rare elements in organic molecules

Answer & Explanation Answer: C) the chemical versatility of carbon atoms

Explanation:

The complexity and variety of organic molecules is due to the chemical versatility of carbon atoms.

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Q:

The modern periodic table consists of 18 groups and 7 periods. What is the atomic number of the element placed in the 1st group and the 4th period?

A) 21	B) 17
C) 19	D) 9

Answer & Explanation Answer: C) 19

Explanation:

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Q:

What is an exothermic reaction?

A) Reaction in which heat is released.	B) Reaction in which heat is absorbed.
C) Reaction in which neither heat is released nor absorbed.	D) None

Answer & Explanation Answer: A) Reaction in which heat is released.

Explanation:

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Q:

Which properties are characteristic of the group 1 metals?

A) Low melting points	B) Produce hydrogen when react with water
C) Soft in nature	D) All of the above

Answer & Explanation Answer: D) All of the above

Explanation:

Group 1 metals are also called as alkali metals with reactive in nature and low melting points. They are soft and produce hydrogen and alkaline metal hydroxide solution when they react with water.

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Q:

Which is the only non-metal placed at the left side of the Modern Periodic Table?

A) Hydrogen	B) Carbon
C) Neon	D) Helium

Answer & Explanation Answer: A) Hydrogen

Explanation:

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Q:

How many atoms are present in a $(NH$ ₄)2SO4 molecule?

A) 15	B) 14
C) 13	D) 12

Answer & Explanation Answer: A) 15

Explanation:

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Q:

Atomic bomb is based on which of the following principle?

A) Nuclear fusion	B) Nuclear fission
C) Natural radioactivity	D) All options are correct

Answer & Explanation Answer: B) Nuclear fission

Explanation:

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Q:

Which of the following is not an example of Allotrope?

A) Diamond	B) Graphite
C) Ozone	D) Steel

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