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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.

111.

Identify the reducing agent in the following reaction:
Zn + CuSO4 → ZnSO4 + Cu

A.

Cu

B.

Zn

C.

ZnSO4

D.

CuSO4

Correct answer is B

The reducing agent is the species that undergoes oxidation and causes the reduction of another species. In this reaction, zinc (Zn) is being oxidized to form zinc sulfate (ZnSO4) while reducing copper sulfate (CuSO4) to copper (Cu).

112.

What is the state of matter in which particles are widely spaced and move freely with high kinetic energy?

A.

Liquid

B.

Solid

C.

Plasma

D.

Gas

Correct answer is D

In the gas state of matter, particles are widely spaced and move freely with high kinetic energy. Gases do not have a definite shape or volume and will fill the entire available space.

113.

Stainless steel is an alloy made up of

A.

Iron and zinc

B.

Copper and tin

C.

Iron and chromium

D.

Iron and carbon

Correct answer is C

Stainless steel is an alloy composed of iron and chromium, with small amounts of other elements like nickel and molybdenum. The addition of chromium provides stainless steel with excellent corrosion resistance.

114.

A gas occupies a volume of 1.5 liters at a pressure of 2 atmospheres. If the pressure is increased to 4 atmospheres while the temperature remains constant, what will be the new volume of the gas?

A.

6 liters

B.

1.5 liters

C.

0.75 liters

D.

3 liters

Correct answer is C

According to Boyle's law (for constant temperature), the product of initial pressure and initial volume is equal to the product of final pressure and final volume. Therefore, (1.5 liters) × (2 atmospheres) = (new volume) × (4 atmospheres). Solving for the new volume gives us (new volume) = (1.5 liters × 2 atmospheres) / 4 atmospheres = 0.75 liters.

115.

What is Faraday's constant?

A.

6.022 x 1023 mol1

B.

3.00 x 108 m/s

C.

9.81 m/s2

D.

96,485 C/mol

Correct answer is D

Faraday's constant is a proportionality constant that relates the amount of electric charge (in coulombs) required to liberate or deposit one mole of substance during an electrolytic reaction. Its value is approximately 96,485 C/mol.