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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

Identify the correct statement regarding CO_______________?
A it combines with H2O to form carbonic acid
B it reacts with red blood cells of haemoglobin
C it is powerful oxidizing agent
D it is used to prepare aerated drinks
Correct Answer: it reacts with red blood cells of haemoglobin
Which sequence of steps is correct for the manufacture of cement ?
A crushing heating mixing grinding
B crushing mixing heating grinding and mixing
C crushing grinding mixing heating
D mixing heating grinding crushing
Correct Answer: crushing grinding mixing heating
Oxidation state +1 for phosphorous is found in___________?
A H3PO3
B H3PO4
C H3PO2
D H2P2O7
Correct Answer: H3PO2
CO2 is gas while SiO2 is solid at room temperature?
A carbon is non-metal while silicon is semi-metal
B CO2 is an independent molecule while SiO2 has network covalent structure
C CO2 forms multiple bond while silicon does not form multiple bonds
D Silicon has all sigma bonds
Correct Answer: CO2 is an independent molecule while SiO2 has network covalent structure
Cement is a mixture of so many compounds roasted in rotary kiln. Which substances has greater percentage ?
A Lime (CaO)
B Silica (SiO2)
C Alumina (Al2O3)
D Magnesia (MgO)
Correct Answer: Lime (CaO)
SO2 reacts with Cl in sunlight to form__________?
A Sulphur dioxide
B Sulphuryl chloride
C Suphanyl chloride
D All of the above
Correct Answer: Sulphuryl chloride
Which of the following is not a use of silicon ?
A Lubricants
B Hydraulic brakes
C Antifreeze
D Water repellent
Correct Answer: Antifreeze
Cement is a mixture of________________?
A clay and clinker
B clay lime stone and gypsum
C lime stone and gypsum
D lime stone and clay
Correct Answer: clay lime stone and gypsum
Argon gas was discovered by_______?
A Rayleigh
B Ramsay
C Lockerey
D Dalton
Correct Answer: Ramsay
Aqueous solution of borax above 62°C gives crystals of________________?
A Na2B4O7.4H2O
B Na2B4O7.5H2O
C Na2B4O7.2H2O
D Na2B4O7.10H2O
Correct Answer: Na2B4O7.5H2O
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