Basics of Extraction — Homi Bhabha Exam Chemistry MCQs with Solutions
Free Homi Bhabha Exam Chemistry Basics of Extraction MCQs with step-by-step solutions (7 questions). Part of Metals & Non-Metals. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Basics of Extraction · medium · theory
The naturally occurring compounds from which metals are extracted are called:
A. slag
B. salts only
C. alloys
D. ores ✓ Correct
Solution: Minerals from which a metal can be profitably extracted are called ores.
Q2 — Basics of Extraction · hard · theory
Highly reactive metals like sodium and aluminium are extracted from their molten compounds by:
A. filtration
B. electrolysis ✓ Correct
C. simple hand-picking
D. heating with carbon
Solution: Very reactive metals cannot be reduced by carbon, so they are obtained by electrolytic reduction.
Q3 — Basics of Extraction · hard · theory
Metals of medium reactivity, such as iron and zinc, are usually extracted from their oxides by:
A. sublimation
B. evaporation
C. electrolysis only
D. reduction with carbon ✓ Correct
Solution: Their oxides are reduced by heating with carbon (a cheaper reducing agent) to give the metal.
Q4 — Basics of Extraction · medium · theory
The chief ore of aluminium is:
A. bauxite ✓ Correct
B. rock salt
C. limestone
D. haematite
Solution: Aluminium is chiefly extracted from bauxite (aluminium oxide ore).
Q5 — Basics of Extraction · medium · theory
The chief ore of iron is:
A. galena
B. bauxite
C. cinnabar
D. haematite ✓ Correct
Solution: Haematite (Fe₂O₃) is a major iron ore.
Q6 — Basics of Extraction · hard · theory
Gold and silver are often found in nature in the free (native) state because they are:
A. very reactive
B. very unreactive (least reactive) ✓ Correct
C. non-metals
D. gases
Solution: Being at the bottom of the reactivity series, they do not readily combine with other elements and occur uncombined.
Q7 — Basics of Extraction · medium · theory
The branch of science dealing with the extraction of metals from their ores is called:
A. astronomy
B. biology
C. metallurgy ✓ Correct
D. geology
Solution: Metallurgy is the science and process of extracting and purifying metals.