1099+ Important Chemistry MCQ Questions Answers

Q:

The number of electrons that can be accommodated in the M shell is

A) 18	B) 8
C) 2	D) 32

Answer & Explanation Answer: A) 18

Explanation:

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Q:

___ is one of the states of matter obtained by cooling a gas of very low density to extremely low temperatures.

A) Gas	B) Plasma
C) Bose-Einstein Condensate (BEC)	D) Plasma Condensate

Answer & Explanation Answer: C) Bose-Einstein Condensate (BEC)

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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:

The smell that we get when LPG cylinder leaks is due to the presence of

A) Nitrogen peroxide	B) Carbon monoxide
C) Sulphur compound	D) Carbon dioxide

Answer & Explanation Answer: C) Sulphur compound

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Q:

One should use porcelain and not metal containers in a microwave oven because..

A) Charge may accumulate on the metal surface and there is danger of getting a shock	B) Porcelain vessels are better conductors of heat and thus food gets cooked quickly
C) Metal containers might undergo chemical reaction leading to spoilage of food	D) Porcelain vessels are cheaper than the metal containers

Answer & Explanation Answer: A) Charge may accumulate on the metal surface and there is danger of getting a shock

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Q:

Which of the following metals does NOT react with Oxygen even at a high temperature?

A) Silver	B) Lead
C) Aluminium	D) Zinc

Answer & Explanation Answer: A) Silver

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Q:

Rupee 5 and 10 coins are now made of

A) Ferritic stainless steel	B) Silver and steel
C) Cupro nickel alloy	D) Copper and brass

Answer & Explanation Answer: C) Cupro nickel alloy

Explanation:

The copper nickel alloys composed of copper with 25% nickel with 0.05-0.4% manganese is commonly used for the manufacture of coins, medals and other semi valuable applications.

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Q:

Least distance of distinct vision for normal eye is

A) 15 cm	B) 20 cm
C) 25 cm	D) 30 cm

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