Engineering Questions with Answers - Multiple Choice Questions
Chemical Industry MCQ’s – Inorganic Chemical – Sea Floor Minerals
1 - Question
Minerals are mined from all environments except from the ______________
a) ocean beaches
b) sub-sea floor rocks
c) continental shelves
d) deep sea floor
View Answer
Explanation: Minerals are mined from all environments except from the deep sea floor area even though it has large mineral deposits (clays, siliceous oozes, manganese nodules and so on) due to lack of advanced technology.
2 - Question
Oil and gas deposits are found in ________ region.
a) ocean beaches
b) sub-sea floor rocks
c) continental shelves
d) deep sea floor
View Answer
Explanation: Oil and gas deposits are found in sub-sea floor rock region along with sulfur, iron ore, salt, coal etc. Ocean beaches have platinum, gold, diamond, quartz etc.
3 - Question
Which separators are used to separate oversize pebbles and undersize clay particles if minerals such as monazite, zircon are present?
a) Revolving trommel
b) Shaking tables
c) Humphrey spirals
d) Magnetic and electrostatic separators
View Answer
Explanation: Generally revolving trommel is used for separation. If minerals like rutile and tin are present shaking tables or Humphrey spirals are used and if minerals like monazite, zircon are present magnetic and electrostatic separators are used.
4 - Question
Which impurity of manganese nodules is leached using H2SO4 as solvent at temperature of 77°F?
a) Cobalt
b) Copper
c) Nickel
d) Iron
View Answer
Explanation: Copper is put into solution when manganese nodules are leached using H2SO4 as solvent at temperature of 77°F. When temperature is around 120°F, nickel goes into solution.
5 - Question
A differential leaching process is used for processing manganese nodules.
a) True
b) False
View Answer
Explanation: The statement is true since copper is removed in first leaching, nickel in second leaching, and then cobalt is removed similarly by altering conditions.