CSS OPTIONAL SUBJECTS MCQs

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Here, you may find CSS Optional Subjects MCQs. If you want to prepare MCQs of optional subjects, CSS MCQs platform is here to serve you while preparing your MCQs portion of your CSS Exam. Please practice these CSS Optional Subjects MCQs on a daily basis.

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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which of the following elements will have strongest Van Der Waal force of attraction between its molecules

A. hydrogen
B. oxygen
C. chlorine
D. nitrogen

Show Answer…
Correct Answer: C. chlorine
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