Extraction Of Metals (Chapter Test - Non-Medical) - Class 12 MCQ
20 Questions MCQ Test - Extraction Of Metals (Chapter Test - Non-Medical)
Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false.
I. In gold Schmidt thermite process aluminium acts as a reducing agent.
II. Mg is extracted by electrolysis of aq. solution of MgCl2
III. Extraction of Pb is possible by smelting.
IV. Red bauxite is purified by Serpeck’s process.
II. Mg is extracted by electrolysis of aq. solution of MgCl2
III. Extraction of Pb is possible by smelting.
IV. Red bauxite is purified by Serpeck’s process.
NaCN is sometimes added in the froth floatation process as the depressant when ZnS and PbS minerals
are extracted because
are extracted because
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Which is known as blister copper?
A common metal used as reductant for the extraction of metals from their oxides is
Match the extraction process listed in column I with metals listed in column II.
The method of Zone refining of metals is based on the principal of
All ores are minerals, while all minerals are not ores, because ....
The metal extracted by leaching of a cyanide is
I. Silver II. Sodium
III. Gold IV. Copper
Choose the correct code regarding roasting process.
I. It is the process of heating ore in air to obtain the oxide.
II. It is an exothermic process.
III. It is used for hydrated oxide and oxygen ore.
IV. It is used after the concentration of ore.
Extraction of group 1 and 2 metals is usually done by
Heating mixture of Cu2O and Cu2S will give
Which of the following processes involves smelting ?
Which of the following processes does not involve oxidation of iron ?
Which of the following statements is correct regarding self reduction ?
Match List -I with List -II for the composition of substances and select the correct answer using the code given below the lists
Which of the following curves assures that the metal obtained by carbon reduction is in the vapour state ?
Which of the following activities is not related to poling ?
(a) If both assertion and reason are correct and reason is the correct explanation of assertion.
(b) If both assertion and reason are correct but reason is not correct explanation of assertion.
(c) If assertion is correct and reason is incorrect.
(d) If assertion is incorrect and reason is correct.
Q.
Assertion : Ag and Au are extracted by leaching their ores with a dilute solution of NaCN.
Reason : Impurities associated with these ores dissolve in NaCN
(a) If both assertion and reason are correct and reason is the correct explanation of assertion.
(b) If both assertion and reason are correct but reason is not correct explanation of assertion.
(c) If assertion is correct and reason is incorrect.
(d) If assertion is incorrect and reason is correct.
Q.
Assertion : During calcination, the ore is heated well below its melting point in the limited supply of oxygen.
Reason : The process of calcination is carried out for sulphide ores.
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