1099+ Important Chemistry MCQ Questions Answers

Q:

Calculate the relative molecular mass of water $H_{2} O$ ?

A) 18u	B) 1.8u
C) 2.0u	D) 20u

Answer & Explanation Answer: A) 18u

Explanation:

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Q:

Which one of the following is a physical change?

A) Burning of coal	B) Burning of wood
C) Heating of a platinum crucible	D) Heating of potassium chlorate

Answer & Explanation Answer: C) Heating of a platinum crucible

Explanation:

In Burning of coal, burning of wood and Heating of Potassium Chlorate there will be some sort of chemical change, but Heating of a Platinum crucible is a physical change.

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Q:

Which of the following can be beaten and converted into thin sheets?

A) Zinc	B) Phosphorus
C) Sulphur	D) Oxygen

Answer & Explanation Answer: A) Zinc

Explanation:

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Q:

The hazardous component in most antifreeze is

A) Ethane alcohol	B) Ethylene Glycol
C) Ehtylene	D) Ethene

Answer & Explanation Answer: B) Ethylene Glycol

Explanation:

Ethylene Glycol is an antifreeze is an additive which lowers the freezing point of a water-based liquid and increases its boiling point.

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Q:

Alcohol is more volatile than water because _________ is lower than water

A) its boiling point	B) its density
C) its viscosity	D) its surface tension

Answer & Explanation Answer: A) its boiling point

Explanation:

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Q:

Which among the following has lowest electron affinity?

A) Fluorine	B) Chlorine
C) Bromine	D) Argon

Answer & Explanation Answer: D) Argon

Explanation:

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Q:

Which among the following is an example of solid sol?

A) Milk of magnesia	B) Foam
C) Coloured gemstones	D) Rubber

Answer & Explanation Answer: C) Coloured gemstones

Explanation:

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Q:

Atomic number of which of the following elements is greater than that of Zinc

A) Copper	B) Iron
C) Chromium	D) Bromine

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