1099+ Important Chemistry MCQ Questions Answers

Q:

Which of the following statements is Incorrect?

A) Atomic size increases from top to bottom	B) All the elements of a group have same valency
C) Isotopes of the same elements are placed in the same group	D) Atomic radius generally decreases from left to right

Answer & Explanation Answer: C) Isotopes of the same elements are placed in the same group

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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:

Which of the following gases makes bread or cake rise making them soft and spongy?

A) CO	B) CO2
C) H2	D) O2

Answer & Explanation Answer: B) CO2

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Q:

Which of the following is a correct pair according to increasing atomic number from left to right?

A) He, H	B) Na, Ne
C) Be, B	D) Ca, Cl

Answer & Explanation Answer: C) Be, B

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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 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:

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:

___ is used as a stabilizer in ice cream.

A) Gelatin	B) Sugar
C) Milk	D) Strawberry

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