This set of Extractive Metallurgy Multiple Choice Questions & Answers (MCQs) focuses on “Pyrometallurgy”.
1. What is the tendency of the movement of the chemical potential state of an element during a chemical reaction?
a) Low to high
b) High to low
c) Remains the same
d) At first, high to low then low to high
View Answer
Explanation: The chemical potential of an element tend to move from high to low during a chemical reaction. The basic aim of the extraction process is to create conditions for such transfers.
2. What is the basis of Pyrometallurgy?
a) Water
b) Low temperature
c) Electricity
d) High temperature
View Answer
Explanation: Most of the metallurgical reactions takes place at high temperature because, at high temperature, ores become unstable making it easy to release metals. So, the basis of Pyrometallurgy is high temperature.
3. A high-temperature process is mostly ______
a) cheaper and more versatile
b) expensive and more versatile
c) cheaper and less versatile
d) expensive and less versatile
View Answer
Explanation: A high-temperature process is cheaper and more versatile because the rate of reaction is accelerated at high temperature. Rapid reaction rates help achieve high production rates.
4. Higher is the temperature of a chemical reaction, smaller is the activation energy barrier.
a) True
b) False
View Answer
Explanation: Activation energy barrier is something which opposes the forward movement of a chemical reaction. High temperature decreases the activation energy barrier.
5. At 50°C temperature, where will be the equilibrium position for the following reaction?
ZnO + C = Zn + CO
a) Far to the right
b) In the middle
c) Far to the left
d) Temperature does not have any effect on the equilibrium position
View Answer
Explanation: At 50°C, the equilibrium position will be far to the left which means that the reaction cannot take place. This reaction will take place only at very high temperatures.
6. Pyrometallurgy does not have any ability to reduce a compound which cannot be reduced from water or an aqueous solution?
a) True
b) False
View Answer
Explanation: One of the advantages of Pyrometallurgy is that is can reduce a compound which is not possible in the presence of an aqueous solution. It can be used to extract high reactive metals.
7. Which of the following processes is not a part of Pyrometallurgy?
a) Calcination
b) Roasting
c) Smelting
d) Leaching
View Answer
Explanation: Leaching is a Hydrometallurgical process. The three main processes of Pyrometallurgy are calcination, roasting and smelting.
Sanfoundry Global Education & Learning Series – Extractive Metallurgy.
To practice all areas of Extractive Metallurgy, here is complete set of Multiple Choice Questions and Answers.
