1099+ Important Chemistry MCQ Questions Answers

Q:

An element has an atomic weight of W and an atomic number of N. The number of protons in the nucleus of its atom is

A) N	B) W
C) W + N	D) W - N

Answer & Explanation Answer: A) N

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Q:

If the electronic configuration of elements A and B are $1 S^{2}, 2 S^{2} 2 P^{6}, 3 S^{1} and 1 S^{2}, 2 S^{2} 2 P^{6}, 3 S^{2} 3 P^{4}$ respectively, then the formula of the compound formed by the combination of these elements will be:

A) AB3	B) AB2
C) A2B	D) AB

Answer & Explanation Answer: C) A2B

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Q:

____ is the process in which acids and bases react to form salts and water.

A) Distillation	B) Electrolysis
C) Neutralisation	D) Hydrolysis

Answer & Explanation Answer: C) Neutralisation

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Q:

What is the valency of magnesium?

A) 1	B) 2
C) 3	D) 4

Answer & Explanation Answer: B) 2

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Q:

If a solution turns blue litmus red, its pH is likely to be

A) 7	B) 8
C) 9	D) 6

Answer & Explanation Answer: D) 6

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Q:

Which of the following solutions is the most acidic among them all?

A) Solution with pH value 0	B) Solution with pH value 6
C) Solution with pH value 1	D) Solution with pH value 7

Answer & Explanation Answer: A) Solution with pH value 0

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Q:

Isobars have _______.

A) Same mass numbers but different atomic numbers	B) Different mass numbers but same atomic numbers
C) Same mass and atomic numbers	D) Different mass and atomic numbers

Answer & Explanation Answer: A) Same mass numbers but different atomic numbers

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Q:

Identify a use of the isotope of uranium.

A) Fuel in nuclear reactors	B) Treatment of goitre
C) Treatment of cancer	D) Fuel in aeroplanes

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