1099+ Important Chemistry MCQ Questions Answers

Q:

A change in which one or more new substances are formed is called _________.

A) Physical Change	B) Chemical Change
C) Rusting	D) Galvanisation

Answer & Explanation Answer: B) Chemical Change

Explanation:

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1 2047

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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0 2041

Q:

Which of the following is not a type of chemical weathering?

A) Corrosion	B) Solution
C) Oxidation	D) Carbonation

Answer & Explanation Answer: A) Corrosion

Explanation:

Chemical weathering is the process of altering rocks chemically when they are broken down. It includes hydrolysis, oxidation, acid rain, etc...

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3 2041

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:

The substances which have very low ignition temperature and can easily catch fire with a flame are called _____________ substances.

A) hazardous	B) perilous
C) incombustible	D) inflammable

Answer & Explanation Answer: D) inflammable

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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1 2029

Q:

Which of the following has the highest boiling point?

A) 2,3-dimethylbutane	B) 2-methylpentane
C) 2,2-dimethylbutane	D) 1,2-methylpentane

Answer & Explanation Answer: C) 2,2-dimethylbutane

Explanation:

Due to the molecules present in the 2,2-dimethylbutane are closely packed, it has the highest boiling point.

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1 2020

Q:

Which base is present in milk of magnesia?

A) Magnesium hydroxide	B) Ammonium hydroxide
C) Sodium hydroxide	D) Calcium hydroxide

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