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Chemistry questions and answers

Chemistry Questions and Answers

Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.

56.

Which of the following is an example of a primary cell?

A.

Alkaline battery

B.

Nickel-cadmium battery

C.

Lead-acid battery

D.

Lithium-ion battery

Correct answer is A

Primary cells are non-rechargeable batteries, and the alkaline battery is a common example of a primary cell

57.

The process of rusting is an example of the formation of

A.

Basic oxide

B.

Acidic oxide

C.

Reducing oxide

D.

Amphoteric oxide

Correct answer is A

Rusting is the corrosion of iron or steel due to exposure to oxygen and moisture in the air, resulting in the formation of iron oxide (Fe2O3 or Fe3O4), which is an example of an acidic oxide.

58.

Chlorine gas is commonly used in the production of which of the following industrial compounds?

A.

Chlorofluorocarbons (CFCs)

B.

Methane

C.

Ammonia

D.

Ethanol

Correct answer is A

Chlorine gas is used in the production of chlorofluorocarbons (CFCs), which were once widely used as refrigerants, aerosol propellants, and foam-blowing agents. However, due to their harmful impact on the ozone layer, their use has been significantly reduced.

59.

What unit of temperature should be used when applying the ideal gas law?

A.

Fahrenheit (°F)

B.

Kelvin (K)

C.

Rankine (°R)

D.

Celsius (°C)

Correct answer is B

Temperature must be expressed in Kelvin when using the ideal gas law. The Kelvin scale is an absolute temperature scale, and its zero point (0 K) corresponds to absolute zero, the point at which the kinetic energy of gas particles is minimal.

60.

Which halogen is a gas at room temperature and is pale yellow in color?

A.

Chlorine (Cl)

B.

Fluorine (F)

C.

Iodine (I)

D.

Bromine (Br)

Correct answer is B

Fluorine is a halogen that is a gas at room temperature and is pale yellow in color. Halogens are a group in the periodic table consisting of five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). Among these, only Fluorine and Chlorine are gases at room temperature, but Chlorine is greenish-yellow, not pale yellow.