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.
Identify the reducing agent in the following reaction:
Zn + CuSO4 → ZnSO4 + Cu
Cu
Zn
ZnSO4
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).
Stainless steel is an alloy made up of
Iron and zinc
Copper and tin
Iron and chromium
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.
6 liters
1.5 liters
0.75 liters
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.
6.022 x 1023 mol−1
3.00 x 108 m/s
9.81 m/s2
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.