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Chemistry 1488 MCQs [All-Courses]

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oost your exam preparation with our Chemistry MCQs designed for PPSC, FPSC, NTS, OTS, PTS, AJKPSC, BPSC, KPPSC, PMS, CSS, and all competitive exams.
Our content covers Basic Chemistry, Atomic Structure, Periodic Table, Chemical Reactions, Acids & Bases, Organic Chemistry, and everyday chemical concepts.

All Topics  1488

The percentage of suspended solid waste in raw water is removed by coagulation is__________________?
A 60
B 70
C 80
D 90
Correct Answer: 80
Liquid crystal is discovered by __________________?
A William Crooks
B Fredrack Reinitzer
C J.J Thomson
D Bravis
Correct Answer: Fredrack Reinitzer
Which one of the following makes the bulk of hydrospheres content ?
A oceans
B glaciers & icecaps
C fresh water lakes and ponds
D All have equal distribution
Correct Answer: oceans
Vapour pressure of water at 100°C is___________________?
A 55 mm Hg
B 760 mm Hg
C 355 mm Hg
D 1489 mm Hg
Correct Answer: 760 mm Hg
Which substance can be used for disinfecting water ?
A KMnO4
B Alums
C Ozone
D All
Correct Answer: KMnO4
In order to mention the boiling point of water at 110°C the external pressure should be ?
A Between 760 torr and 1200 torr
B Between 200 torr and 760 torr
C 765 torr
D any value of pressure
Correct Answer: Between 760 torr and 1200 torr
The main pollutant of leather tanneries in the waste water is____________________?
A chromium III
B chromium IV
C chromium V
D chromium VI
Correct Answer: chromium IV
When substance moves from a solid to a liquid state all of the following changes occur except__________________?
A Molecules become more disordered
B K.E of the molecules decreases
C Intermolecular forces become weaker
D Molecule become further separated
Correct Answer: K.E of the molecules decreases
Newspaper can be recycled again and again how many times ?
A 2
B 3
C 4
D 5
Correct Answer: 5
Which of the following has strongest intermolecular forces of attraction ?
A Hydrogen (H2)
B Chlorine (Cl2)
C lodine (I2)
D Methane (CH4)
Correct Answer: lodine (I2)
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