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.
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 10\(^{23}\) mol\(^{-1}\)
3.00 x 10\(^8\) m/s
9.81 m/s\(^2\)
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.
Which of the following methods can be used to remove temporary hardness from water?
Boiling
Filtration
sedimentation
Chlorination
Correct answer is A
Temporary hardness in water can be removed by boiling. When water is boiled, the calcium and magnesium bicarbonates decompose, forming insoluble calcium carbonate (CaCO3) and magnesium carbonate (MgCO3), which precipitate out of the water.
Which trace gas in the atmosphere plays a significant role in the greenhouse effect?
Oxygen
Argon
Carbon dioxide
Nitrogen
Correct answer is C
Carbon dioxide (CO2) is a trace gas in the atmosphere, but it plays a significant role in the greenhouse effect. It absorbs and traps heat from the Earth's surface, contributing to global warming.