1099+ Important Chemistry MCQ Questions Answers

Q:

The pH value increase from 7 to 14 represents a

A) decrease in H+ ion concentration	B) decrease in OH- ion concentration
C) increase in OH- ion concentration	D) increase in H+ ion concentration

Answer & Explanation Answer: C) increase in OH- ion concentration

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Q:

Sphalerite is an ore/mineral of

A) Mercury	B) Molybdenum
C) Silver	D) Zinc

Answer & Explanation Answer: D) Zinc

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Q:

15% of an alloy was silver. If in a quantity of alloy there was 51 g of silver, what was the quantity of the other elements in the alloy?

A) 204 g	B) 340 g
C) 300 g	D) 289 g

Answer & Explanation Answer: D) 289 g

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Q:

Pick the odd one out from the following:

A) NaOH	B) Cu(OH)2
C) NH4OH	D) Zn(OH)2

Answer & Explanation Answer: A) NaOH

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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:

How many atoms will one mole of Carbon (C-12) contain?

A) 6.02 x 1023	B) 8.06 x 1020
C) 6.02 x 1026	D) 60.20 x 1026

Answer & Explanation Answer: A) 6.02 x 1023

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Q:

What is the Greenhouse Effect?

A) The fall in population of plants due to human activity	B) It is the warming of earth's surface due to its atmosphere
C) The polluting effect of burning fossil fuels	D) The heating of the atmosphere due to depletion of the ozone layer

Answer & Explanation Answer: B) It is the warming of earth's surface due to its atmosphere

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Q:

What is C12H22O11 also known as

A) Sand	B) Sugar
C) Salt	D) Clay

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