General Principles and Processes of Isolation of Elements - Online Test
Q1. Which technique utilizes the density difference between the ore and the impurity to concentrate the ore is
Answer : Option B
Explaination / Solution:
Levigation is process of grinding an insoluble substance to a fine powder while wet. The material is introduced into mill together with water. It is based on the density difference between ore and impurity.
Q2. Gravity separation technique is mainly applicable to
Answer : Option B
Explaination / Solution:
Gavity separation is done maily for oxide ores.
Q3. The diagram shows schematic representation of
Answer : Option D
Explaination / Solution:
This is hydraulic washing or gravity separation. Here whwn stream of water is passed it takes away all the impurity with it.
Q4. Which process is usually applied for separating gangue from sulphide ores?
Answer : Option A
Explaination / Solution:
Sulphide ores are concentrated using Froth floatation.
Q5. The impurity that is added externally to remove the impurity already present in the ore is known as
Answer : Option D
Explaination / Solution:
Flux combines with impurities to form Slag which is easily separable.
Q6. Conversion of ore to oxide is generally carried out by the process of
Answer : Option B
Explaination / Solution:
Calcination is employed for carbonate ores to convert into respective oxide ores. Roasting is employed for sulphide ores for convertion to oxide ores.
Q7. Pyrometallurgy is the process of
Answer : Option A
Explaination / Solution:
Pyro means heating. Pyrometallurgy is convertion of oxide to metal.
Q8. The process in which the concentrated ore is heated to a high temperature in the absence of air is known as
Answer : Option B
Explaination / Solution:
Carbonate ore is heated to a high temperature in the absence of air is calcination.
Q9. ZnCO3(s)−→ΔZnO(s) + CO2 ;The reaction shows the process of
Answer : Option C
Explaination / Solution:
Carbonate ore is heated to a high temperature in the absence of air is calcination
Q10. What is the temperature of zone of slag formation?
Answer : Option D
Explaination / Solution:
Slag is formed in the temperature range 1000-1300 oC
