1099+ Important Chemistry MCQ Questions Answers

Q:

Atoms have no electric charge because they

A) have same number of electrons and neutrons	B) have same number of electrons and protons
C) have same number of protons and neutrons	D) have same number of protons, electrons and neutrons

Answer & Explanation Answer: B) have same number of electrons and protons

Explanation:

Atoms are composed of three main particles called electrons, protons and neutrons. We know that, the electrons are negatively charged particles whereas protons are positively charged and neutrons have no charge.

Hence, as the number of electrons and protons are equal and they are oppositely charged, the atom will have no charge as their charges cancel each other.

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Q:

Atomic number is always equal to ______.

A) Number of protons	B) Number of neutrons
C) Number of electrons	D) Sum of protons and neutrons

Answer & Explanation Answer: A) Number of protons

Explanation:

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Q:

An example of an extensive property of matter is

A) Volume	B) Mass
C) Density	D) All the above

Answer & Explanation Answer: D) All the above

Explanation:

Any properties that are dependent on the amount of matter are called as extensive properties of matter.

Examples are :: Mass, Volume, Density (M/V),...

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Q:

German Silver contains

A) 100% pure silver	B) 10% silver
C) 1% silver	D) 0% silver

Answer & Explanation Answer: D) 0% silver

Explanation:

German Silver is an alloy of copper, nickel and zinc. It is composed of 60% copper, 20% nickel and 20% zinc. Due to its white-silverish appearance it is named as german silver but it contains no silver in it.

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Q:

........... as is used as an illuminating gas.

A) Methyl	B) Propane
C) Butene	D) Ethyne

Answer & Explanation Answer: B) Propane

Explanation:

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Q:

Arrange the following compounds in order of increasing acidity?

A) o-cresol < phenol < o-nitrophtenol	B) phenol < o-nitrophtenol < o-cresol
C) o-nitrophtenol < o-cresol < phenol	D) None of the above

Answer & Explanation Answer: A) o-cresol < phenol < o-nitrophtenol

Explanation:

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Q:

The chemical makeup of a rock is

A) Nutrients	B) Minerals
C) Metals	D) Water

Answer & Explanation Answer: B) Minerals

Explanation:

The chemical composition of a rock is mainly minerals.

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Q:

The (O-H) bond in ${CH}_{3} OH$ is _____.

A) polar covalent	B) ionic
C) non polar covalent	D) cationic

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