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Chemistry 1488 MCQs [All-Courses]

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.

The fertility of the soil is improved by________________?

A Rotation of the crops

B Adding lime to the acid salts

C Adding manure and growing legumes

D All

Review Detailed Answer

Correct Answer: All

A sample of an iron and oxygen ore has a mass of 35.8 grams. The iron in the compound has a mass of 27.9 grams. What is the percent iron in the ore?

A 74% Fe

B 75% Fe

C 77% Fe

D 78% Fe

Review Detailed Answer

Correct Answer: 78% Fe

If temperature of gallium arsenide is increased then its conductivity will___________________?

A decrease

B increase

C remains constant

D first decreases then increases

Review Detailed Answer

Correct Answer: increase

Nucleic acids direct the synthesis of__________________?

A Glucose

B Triglycerides

C Proteins

D All

Review Detailed Answer

Correct Answer: Proteins

A compound is determined to have an emperical formula of C2H6O and a molar mass of 138 g/mole. What is the molecular formula?

A C2H6O

B C6H18O3

C C6H12O6

D C2H5O

Review Detailed Answer

Correct Answer: C6H18O3

The coloured glassy mass in borax bead test is due to the formation of___________________?

A metal borate

B metal meta borate

C metal boride

D metal silicate

Review Detailed Answer

Correct Answer: metal meta borate

Purines and pyrimidines are__________________?

A Enzymes

B Nitrogenous bases

C Carbohydrates

D Lipids

Review Detailed Answer

Correct Answer: Nitrogenous bases

A substance is analyzed and found to have an emperical formula of CH2 and a molar mass of 56g/mole. What is the molecular formula of the compound?

A C2H4

B C3H6

C C4H8

D C5H10

Review Detailed Answer

Correct Answer: C4H8

Boron is non metal while other elements of IIIA group are metals. This is because______________?

A it has small size

B it has high nuclear charge

C it forms molecular addition compounds

D all of the above

Review Detailed Answer

Correct Answer: all of the above

Rate of enzymatic reaction is directly proportional to the concentration of___________________?

A Enzyme

B Substrate

C Enzyme and substrate

D Enzyme and product

Review Detailed Answer

Correct Answer: Substrate

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Chemistry 1488 MCQs [All-Courses]

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All Topics 1488

The fertility of the soil is improved by________________?

A sample of an iron and oxygen ore has a mass of 35.8 grams. The iron in the compound has a mass of 27.9 grams. What is the percent iron in the ore?

If temperature of gallium arsenide is increased then its conductivity will___________________?

Nucleic acids direct the synthesis of__________________?

A compound is determined to have an emperical formula of C2H6O and a molar mass of 138 g/mole. What is the molecular formula?

The coloured glassy mass in borax bead test is due to the formation of___________________?

Purines and pyrimidines are__________________?

A substance is analyzed and found to have an emperical formula of CH2 and a molar mass of 56g/mole. What is the molecular formula of the compound?

Boron is non metal while other elements of IIIA group are metals. This is because______________?

Rate of enzymatic reaction is directly proportional to the concentration of___________________?