1099+ Important Chemistry MCQ Questions Answers

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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Q:

How many atoms are present in a $(NH$ ₄)2SO4 molecule?

A) 15	B) 14
C) 13	D) 12

Answer & Explanation Answer: A) 15

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:

What relationship exists between an enzyme and a catalyst?

Answer

An enzyme is a variety of catalyst and is the relation between tham. A catalyst is a chemical that increases the rate of a chemical reaction without itself being changed by the reaction.

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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 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:

Adding which substance gives blue colour to glass?

A) Manganese oxide	B) Cobalt oxide
C) Chromium oxide	D) Iron oxide

Answer & Explanation Answer: B) Cobalt oxide

Explanation:

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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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