The process of extracting a metal by heating its oxide ore with a reducing agent is called: MCQ with Answer and Explanation

Question
The process of extracting a metal by heating its oxide ore with a reducing agent is called:
A. Smelting
B. Leaching
C. Calcination
D. Roasting
Answer: Option A
Solution (By JKExamLibrary)
Smelting involves heating a metal oxide ore (roasted or calcined) with a reducing agent like coke (carbon) or CO to obtain the metal in the molten state. Example: Fe₂O₃ + 3CO → 2Fe + 3CO₂ in blast furnace. Calcination: heating carbonate/ hydroxide ore in absence of air. Roasting: heating sulfide ore in excess air. Leaching: chemical dissolution of ore. Smelting is a key pyrometallurgical step.
This question belongs to: Science chemistry
Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More chemistry Questions

Question #1
The valency of oxygen in H₂O is:
A. 1
B. 6
C. 4
D. 2
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
Oxygen (atomic number 8) has electronic configuration 2,6. It needs 2 more electrons to complete its octet. In water (H₂O), it shares two electrons (one each with two hydrogen atoms), forming two covalent bonds. Hence valency = 2. Oxidation number is -2.
This question belongs to: Science chemistry
Question #2
Assertion (A): Micelle formation occurs when soap is dissolved in water. Reason (R): The hydrophobic tails of soap molecules cluster together to avoid water, while the hydrophilic heads face outward.
A. A is true but R is false.
B. Both A and R are true and R is the correct explanation of A.
C. A is false but R is true.
D. Both A and R are true but R is NOT the correct explanation of A.
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
In water, soap molecules arrange themselves into spherical aggregates called micelles. The hydrophobic hydrocarbon tails point inward, away from water, while the hydrophilic ionic heads point outward, interacting with water. This structure traps oily dirt in the center, allowing it to be washed away.
This question belongs to: Science chemistry
Question #3
Which enzyme breaks down starch into sugars?
A. Pepsin
B. Lipase
C. Amylase
D. Trypsin
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Amylase (present in saliva and pancreatic juice) hydrolyses starch into maltose and dextrins. Pepsin digests proteins in the stomach. Lipase breaks down fats. Trypsin also digests proteins. Enzymes are specific biocatalysts.
This question belongs to: Science chemistry
Explore All chemistry MCQs
Today's Top Topics
chemistry 1089 Physics 1287 Biology 2054
Explore Subjects
Reasoning 0 Current Affairs 575 History GK 3374 Static General Knowledge 6362 Science 4430
Practice Mix
Which structural part of an email address uniquely identifies the specific inbox owner within a particular hosting provider's domain platform?
The average of 40 observations is 52. If one observation was recorded as 72 instead of 27, the correct average is:
Which state became the first in India to launch a Marine Spatial Plan (MSP) for integrated coastal management?
He drove _______ carelessly that he had an accident.
The 'Lehna Singh Conspiracy' case of 1941 was associated with which movement?