Metallurgy MCQs Concise Class-10 ICSE Chemistry Selina Solutions Chapter-7. We Provide Step by Step Answer of MCQs Questions of Miscellaneous Exercise-7 for ICSE Class-10. The given Solutions is according to the Latest editions. Visit official Website CISCE for detail information about ICSE Board Class-10.
Metallurgy MCQs Concise Class-10 ICSE Chemistry Selina Solutions Chapter-7
| Board | ICSE |
| Book / Publication | Concise / Selina |
| Subject | Chemistry |
| Class | 10th |
| Writer | Dr SP Singh |
| Chapter-7 | Metallurgy |
| Topics | MCQs (Miscellaneous Exercise) |
| Edition | 2025-2026 |
MCQs on Metallurgy With Answer
Page-141 (Choose the correct answer from the options given below).
Que-1: The main ore used for the extraction of iron is:
(a) Haematite
(b) Calamine
(c) Bauxite
(d) Cryolite
Ans: (a) Haematite
Hint: Iron is mainly extracted from its chief ore haematite (Fe2O3)
Que-2: Heating an ore in a limited supply of air or in the absence of air at a temperature just below it’s melting point is known as :
(a) Smelting
(b) Ore dressing
(c) Calcination
(d) Bessemerisation
Ans: (c) Calcination
Hint: When an ore is a carbonate or a hydrated oxide, it is heated in the absence of air (or air might be supplied in a limited quantity) to a temperature that is high but insufficient to melt the ore. The process is known as Calcination.
Que-3: The compound that is not an ore of aluminium is:
(a) Cryolite
(b) Corundum
(c) Fluorspar
(d) Bauxite
Ans: (c) Fluorspar
Hint: Fluorspar, also known as fluorite, is a mineral form of calcium fluoride which acts as a solvent along with cryolite, for the electrolytic mixture. Whereas, Bauxite, Corundum and cryolite are the ores of aluminium.
Que-4: Fused alumina is reduced to aluminium by electrolytic reduction, since:
(a) alumina is highly stable.
(b) alumina is least stable.
(c) alumina is not reduced by drying agents.
(d) alumina is not reduced by reducing agents.
Ans: (d) alumina is not reduced by reducing agents.
Hint: Electrolytic reduction is chosen as the method for reducing alumina. Since, aluminium oxide due to its great affinity for oxygen is a very stable compound. It is not reduced easily by common reducing agents like carbon, carbon monoxide or hydrogen.
Que-5: The chemical name of the principal ore of aluminium is:
(a) sodium aluminium fluoride
(b) aluminium oxide
(c) hydrated aluminium fluoride
(d) hydrated aluminium oxide
Ans: (d) hydrated aluminium oxide
Hint: Main ore of aluminium is bauxite (Al2O3.2H2O) and its chemical name is hydrated aluminium oxide
Que-6: Brass is an alloy of
(a) Copper and tin
(b) Copper and zinc
(c) Zinc and lead
(d) Lead and tin
Ans: (b) Copper and zinc
Hint: Brass is an alloy of Copper and zinc. Brass is stronger than its components.
Que-7: Steel is an alloy of iron and:
(a) Nickel
(b) Zinc
(c) Carbon
(d) Aluminium
Ans: (a) Nickel
Hint: Steel is an alloy of iron, chromium, nickle and carbon. it is made to increase the strength of iron.
Que-8: The reason for using aluminium in the alloy duralumin is
(a) Aluminium is brittle.
(b) Aluminium gives strength.
(c) Aluminium brings lightness.
(d) Aluminium lowers melting point.
Ans: (c) Aluminium brings lightness.
Reason — Aluminium is used in duralumin along with copper because it imparts lightness.
Que-9: Duralumin is an alloy with composition:
P — Al and Mg
Q — Al, Cu and Mg
R — Al and Mn
(a) Only P
(b) Only Q
(c) Both P and R
(d) Only R
Ans: (b) Only Q
Hint: Duralumin ia an alloy with composition of Aluminium (95%), Copper (4%) and Magnesium (0.5%).
The following questions are Assertion-Reason based questions. Choose the answer based on the codes given below.
1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.
Que-10:
Assertion (A): Hydrogen is a non-metal and can even form positive ions.
Reason (R): Metals are defined as the elements which form positive ions by the loss of electrons.
(a) (1)
(b) (2)
(c) (3)
(d) (4)
Ans: (b) (2) Both A and R are true but R is not the correct explanation of A.
Explain Why :- Hydrogen is a non-metal which also forms positive ions by losing its electron like metals. Hence, assertion (A) is true.
Metals are defined as the elements which form positive ions by the loss of electrons. Hence, reason (R) is true.
However, reason (R) does not explain how hydrogen form positive ion. Hence, reason (R) is not correct explanation of assertion (A).
Que-11:
Assertion (A): Sodium and potassium are reactive elements.
Reason (R): Sodium and potassium occur in free states
(a) (1)
(b) (2)
(c) (3)
(d) (4)
Ans: (c) (3) A is true but R is false.
Explain Why :- Sodium and potassium are highly reactive in nature. Hence, assertion (A) is true. Sodium and potassium are so reactive. So, they do not occur in free states. They quickly combine with other elements. Hence reason (R) is false.
Que-12:
Assertion (A): Minerals are the substances from which metals can be extracted profitably.
Reason (R): Ores are those minerals from which metals are extracted commercially and profitably.
(a) (1)
(b) (2)
(c) (3)
(d) (4)
Ans: (d) (4) A is false but R is true.
Explain Why :- Minerals are the naturally occurring compounds of metals. But not every mineral can be used to extract metals profitably. Hence assertion (A) is false.
Ores are those minerals from which metals are extracted commercially at a comparatively lower cost and with minimum effort. Hence reason (R) is true.
Que-13:
Assertion (A): Aluminium is extracted from its ore bauxite.
Reason (R): Bauxite is the only ore of aluminium.
(a) (1)
(b) (2)
(c) (3)
(d) (4)
Ans: (c) (3) A is true but R is false.
Explain Why :- Main ore of aluminium is bauxite (Al2O3.2H2O). Hence, assertion (A) is true.
Bauxite is not the only ore of aluminium. Aluminium can be extracted from other ores like cryolite and corundum. Hence reason (R) is false.
Que-14:
Assertion (A): Metallurgy deals with the production and purification of metals.
Reason (R): Reduction is one of the methods of extraction of metals.
(a) (1)
(b) (2)
(c) (3)
(d) (4)
Ans: (b) (2) Both A and R are true but R is not the correct explanation of A.
Explain Why :- Metallurgy deals with the production and purification of metals and manufacture of alloys. Hence, assertion (A) is true.
They are many different methods of concentration or purification of an ore and reduction is one of the methods of extraction of metals. Hence, reason (R) is true.
But reason (R) doesn’t explain why it is important to purify and produce the pure metal from the process of metallurgy. Hence, reason (R) is not correct explanation of assertion (A).
Que-15:
Assertion (A): The concentration of aluminium is not done by leaching process.
Reason (R): In leaching process, the ore is dissolved in an acid or alkali
(a) (1)
(b) (2)
(c) (3)
(d) (4)
Ans: (d) (4) A is false but R is true.
Explain Why :- The leaching method is used for the concentration of metals like aluminium, silver and gold. Hence, assertion (A) is false.
The ore is treated with a suitable reagent like acid, base or some other reagent, such that the ore is soluble in it but the impurities are not. The impurities are removed by filtration. Hence, reason (R) is true.
Que-16:
Assertion (A): Bayer’s process is used in the extraction of aluminium from its main ore.
Reason (R): Bayer’s process is done for the refinement of aluminium,
(a) (1)
(b) (2)
(c) (3)
(d) (4)
Ans: (c) (3) A is true but R is false.
Explain Why :- Bayer’s process is used for the purification of bauxite ore. Where, bauxite is converted into alumina. Which is reduced to aluminium using electrolytic reduction. Hence, assertion (A) is true.
Refining of aluminium is done by hoope’s electrolytic process not bayer’s process. Hence, reason (R) is false.
Que-17:
Assertion (A): Reactive metals like calcium, magnesium cannot be obtained by reduction.
Reason (R): Reactive metals have a great affinity towards oxygen
(a) (1)
(b) (2)
(c) (3)
(d) (4)
Ans: (a) (1) Both A and R are true and R is the correct explanation of A.
Explain Why :- Highly reactive metals like calcium, magnesium have great affinity towards oxygen and so cannot be reduced by common reducing agents like coke (carbon), carbon monoxide or hydrogen. Such metals are obtained by electrolytic reduction. Hence, both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Que-18:
Assertion (A): Aluminium is obtained from its oxide by electrolysis.
Reason (R): Aluminium has a great affinity towards oxygen so common reducing agents are not able to reduce it.
(a) (1)
(b) (2)
(c) (3)
(d) (4)
Ans: (a) (1) Both A and R are true and R is the correct explanation of A.
Explain Why :- Aluminium oxide (Al2O3) is obtained from its ore bauxite through bayer’s process. Since aluminium oxide is highly reactive and has greater affinity towards oxygen so it cannot be reduced by common reducing agent. Thus, it is reduced to aluminium using electrolysis. Hence, both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Que-19:
Assertion (A): For electrical heating devices like electric iron and heater, alloys are used.
Reason (R): Alloys have a greater resistance and low melting point.
(a) (1)
(b) (2)
(c) (3)
(d) (4)
Ans: (b) (2) Both A and R are true but R is not the correct explanation of A.
Explain Why :- Alloys are used for heating devices like electric iron and heater because of its high resistance to electricity. Hence, assertion (A) is true. Generally alloys have great resistance to electricity. Thus, they can produce more heat and alloys also have lower melting point than its individual component. Hence, reason (R) is true.
However, in case of electrical iron and heater, alloys have high melting point to withstand the heat, Hence, reason (R) is not correct explanation of assertion (A).
Que-20:
Assertion (A): Bronze is used in making medals, statues, etc.
Reason (R): Bronze is hard and easily cast.
(a) (1)
(b) (2)
(c) (3)
(d) (4)
Ans: (a) (1) Both A and R are true and R is the correct explanation of A.
Explain Why :- Bronze is composed of copper (80%), tin (18%) and zinc (2%). It is used in making medals, statues, utensils, etc. Hence, assertion (A) is true.
Bronze is used in making of medals, statues, utensils, bearing and coins because of its hardness and it can be casted easily. Hence, reason (R) is true and it is the correct explanation of assertion (A).
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