1099+ Important Chemistry MCQ Questions Answers

Q:

Which of the following elements has a total of 3 shells with 8 electrons in the last orbit?

A) Ar	B) P
C) S	D) Al

Answer & Explanation Answer: A) Ar

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1 1305

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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1 1304

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 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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0 1302

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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0 1302

Q:

When milk becomes sour, ___ is produced.

A) Lactose	B) Lactic acid
C) Salicylic acid	D) Linoleic acid

Answer & Explanation Answer: B) Lactic acid

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4 1301

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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1 1299

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

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