1099+ Important Chemistry MCQ Questions Answers

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

Answer & Explanation Answer: A) Fuel in nuclear reactors

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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:

According to Newlands' law of Octaves, how many elements exist in nature?

A) 56	B) 66
C) 55	D) 65

Answer & Explanation Answer: A) 56

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Q:

What are transition elements?

A) Elements whose two outermost shells are incomplete	B) Elements which possess properties of both, metals and non-metals
C) They have eight electrons in the outermost shell	D) Elements whose three outermost shells are incomplete

Answer & Explanation Answer: A) Elements whose two outermost shells are incomplete

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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:

Which of the following statements is wrong with regard to strong acids?

A) Strong acids react very rapidly with other substances (such as metal carbonates and metal hydrogen carbonates)	B) Hydrochloric acid, Sulphuric acid and Nitric acid are strong acids
C) Acids are those chemical substances that have a salty taste	D) All minerals acids are strong acids

Answer & Explanation Answer: C) Acids are those chemical substances that have a salty taste

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Q:

For dilution of a concentrated acid, we should add:

A) water into the diluted acid	B) water into the concentrated acid
C) first water into the acid and then more acid into the water	D) concentrated acid into water

Answer & Explanation Answer: B) water into the concentrated acid

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Q:

___ is used in yellow lamp street lights.

A) Neon	B) Nitrogen
C) Phosphorous	D) Sodium

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