1099+ Important Chemistry MCQ Questions Answers

Q:

What is the maximum number of states of matter?

A) Three	B) Four
C) Five	D) Variable

Answer & Explanation Answer: C) Five

Explanation:

There are five known states of matter: solids, liquids, gases, plasma and Bose-Einstein condensates. The main difference in the structures of each state is in the densities of the particles.

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Q:

In which of the following ${MgCl}_{2}$ is soluble?

A) Petrol	B) Acetone
C) Kerosene	D) Water

Answer & Explanation Answer: D) Water

Explanation:

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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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1 1840

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:

Which of the following is NOT a nucleon?

A) Proton	B) Electron
C) Neutron	D) No option is correct

Answer & Explanation Answer: B) Electron

Explanation:

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4 1830

Q:

The monomer/monomers used for the synthesis of Nylon 6 is/are

A) hexamethylenediamine and adipic acid	B) caprolactam
C) urea and formaldehydeD.	D) phenol and formaldehyde

Answer & Explanation Answer: A) hexamethylenediamine and adipic acid

Explanation:

Nylon is made when the appropriate monomers (the chemical building blocks which make up polymers) are combined to form a long chain via a condensation polymerisation reaction. The monomers for nylon 6-6 are adipic acid and hexamethylene diamine

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Q:

The phosphorus cycle differs from the biogeochemical cycles in that

A) does not have atmospheric reservoir	B) uses water more
C) have atmospheric reservoir	D) None of the above

Answer & Explanation Answer: A) does not have atmospheric reservoir

Explanation:

Unlike other gas cycles, the phosphorus cycle differs in having atmospheric reservoir. No other gases are involved in it.

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2 1827

Q:

________ is used for making vinegar.

A) Tartaric acid	B) Malic acid
C) Oxalic acid	D) Acetic acid

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