Chemistry Mcqs

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Chemistry MCQs

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Chemistry MCQs by CSS MCQs

Chemistry MCQs by CSSMCQs

Here, you will find all Chemistry MCQs with their Answers. These MCQs would help you achieve good marks in ALL kinds of entry tests of  FPSC, PPSC, KPPSC, SPSC, NTS, PTS, OTS, CTS, MDCAT, ECAT, ETEA, NUMS and all other entry tests preparation etc. They will also help you get better marks in any types of job or university admission tests. Our focus will be on the fundamental level of the Chemistry course. However, advance level and its main branches MCQs will also be shared with their correct answers. For other subject’s MCQs Click HERE

A student subtracted 0.00055 from 10.2345678 and reported the result as 10.23401. But his friend told him that the result was wrong. What is the correct result?

A. 10.234017
B. 10.2340178
C. 10.234
D. 10.23

Show Answer…
Correct Answer: D. 10.23
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The following statement contained in a student’s laboratory report is a conclusion.

A. a gas is liberated
B. colour of the gas is greenish yellow
C. oxide of the gas is strongly acidic
D. the gas is chlorine

Show Answer…
Correct Answer: D. the gas is chlorine
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A 50.00 mL sample of a cough mixture prepared by a pharmacist was found to have a mass of 46.0g. what is the density (in g/mL) of this mixture. Stated to the correct number of significant figures?

A. 0.92
B. 0.920
C. 0.9200
D. 1.087

Show Answer…
Correct Answer: B. 0.920
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Tobacco contains a poisonous alkaloid called Nicotine. The molecular formula of nicotine is C10H14N2 (molar mass = 162.23g). The mass percentage of nitrogen in nicotine, is?

A. 4.32%
B. 8.23%
C. 12.4%
D. 17.3%

Show Answer…
Correct Answer: D. 17.3%
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A sample of an ionic compound contains 2.82 g Na, 4.35 g CI, and 7.83 g O. The empirical formula of this compound is:

A. NaClO2
B. NaCIO3
C. NaCIO
D. NaCIO4

Show Answer…
Correct Answer: D. NaCIO4
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Professor Anwar told his students that air is a mixture because: suddenly a student raised his hand and said

A. it is colourless
B. oxygen can be removed from it
C. its composition is different at different altitudes
D. it has different properties from its constituents

Show Answer…
Correct Answer: C. its composition is different at different altitudes
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Imagine Dr. Khan is sitting in a room. The room is closed from all sides, no entry, no exit of any gas. If the room expands suddenly then

A. he will be frightened
B. his blood pressure will decrease
C. he will feel cool
D. he will feel warmth

Show Answer…
Correct Answer: C. he will feel cool
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