1099+ Important Chemistry MCQ Questions Answers

Q:

The most serious air pollutant causing health hazard is

A) Sulphur dioxide	B) Carbon monoxide
C) Ozone	D) Nitrogen oxide

Answer & Explanation Answer: A) Sulphur dioxide

Explanation:

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Q:

Infiltration is the process by which rainwater becomes

A) river water	B) ground water
C) salt water	D) ocean water

Answer & Explanation Answer: B) ground water

Explanation:

The process of absorbtion of rain water by the soil on the earth is called infiltration. By this process, the rain water that falls on the soil becomes ground water.

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Q:

The main mineral constituents of the continental mass are ________ and alumina.

A) iron oxide	B) silica
C) water	D) oxygen

Answer & Explanation Answer: B) silica

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Q:

Which of the following inert gases is placed in period 4 of the periodic table?

A) Kr	B) Rn
C) Xe	D) Ar

Answer & Explanation Answer: A) Kr

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Q:

A change in which a substance undergoes a change in its physical properties is called _____________.

A) Chemical Properties	B) Physical Properties
C) Chemical Change	D) Physical Change

Answer & Explanation Answer: D) Physical Change

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Q:

Which one of the following elements is essential for the formation of chlorophyll in green plants?

A) Calcium	B) Iron
C) Magnesium	D) Potassium

Answer & Explanation Answer: C) Magnesium

Explanation:

Forms taken up by plants: Mg++ Functions in plants: a part of the chlorophyll molecule -essential in photosynthesis: related to phosphorus metabolism: large quantities found in seed.Mg deficiency symptoms: Mg is mobile, so symptoms occur first in old leaves; A whitish or yellowish striping effect on grasses.

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Q:

Bauxite is used as raw material by which industry

A) Aluminium	B) Iron
C) Steel	D) Gold

Answer & Explanation Answer: A) Aluminium

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Q:

Which of the following elements has the electronic configuration 2, 8, 3?

A) Magnesium	B) Sodium
C) Aluminium	D) Argon

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