11th Class Chemistry Book in Hindi. We covered all the 11th Class Chemistry Book in Hindi MCQs in this post for free so that you can practice well for the exam.
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11th Class Chemistry Book in Hindi Objective for Students
Which of the following ore is concentrated by the froth floatation process?
(a) Haematite
(b) Carnalite
(c) Sphalerite
(d) Calamine
Option c - Sphalerite
The froth floatation process for the concentration of ores is an illustration of the practical application of
(a) absorption
(b) adsorption
(c) sedimentation
(d) coagulation
Option b - adsorption
If the ore is soluble in some suitable solvent but impurities are not, then the most suitable method of concentration of ore is
(a) leaching
(b) froth floatation method
(c) hydraulic washing
(d) None of the above
Option a - leaching
The concentrated ore is generally converted into oxides because
(a) oxides are generally unstable.
(b) oxides generally have high melting points.
(c) oxides are easier to reduce.
(d) All of the above
Option c - oxides are easier to reduce
The true statement about the roasting process is
(a) impurities are removed as their volatile oxide.
(b) ore is converted into its oxide.
(c) processes like oxidation, chlorination, etc, take place.
(d) All of the above
Option d - All of the above
Sulfide ores are common for the metals
(a) Ag, Cu and Pb
(b) Ag, Cu and Sn
(c) Ag, Mg and Pb
(d) Al, Cu and Pb
Option a - Ag, Cu and Pb
Which of the following is a true statement regarding calcination?
(a) The ore is heated strongly in the absence of any blast of air.
(b) The ore is heated with calcium.
(c) The ore is heated with carbon.
(d) The mineral is melted with limestone.
Option a - The ore is heated strongly in the absence of any blast of air
The chemical process in the production of steel from haematite ore involves
(a) oxidation
(b) reduction
(c) oxidation followed by reduction
(d) reduction followed by oxidation
Option c - oxidation followed by reduction
Chemical leaching is useful in the concentration of
(a) copper pyrites
(b) bauxite
(c) galena
(d) cassiterite
Option b - bauxite
The manufacturing of iron from iron ore involves the process of
(a) oxidation
(b) reduction
(c) electrolysis
(d) fractional distillation
Option b - reduction
When metal is obtained in the molten state from its ore, the process may be called
(a) rusting
(b) smelting
(c) calcination
(d) thermal dissociation
Option b - smelting
Which of the following is not used for refining metals?
(a) Liquation
(b) Chromatographic methods
(c) Distillation
(d) Leaching
Option d - Leaching
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