Only One Option Correct Type
Direction (Q. Nos. 1-30) This section contains 30 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Q.
The most electropositive metals are isolated from their ores by
Which of the following does not involve heating?
1 Crore+ students have signed up on EduRev. Have you? Download the App |
Which is incorrectly matched?
Magnesium is extracted from sea water by Dow process. In this process to separate Mg, the process carried is
Roasted iron ore is mixed with coke and lime stone and smelted in blast furnace. Which among the following does not represent the correct answer about the reactions taking place in the blast furnace?
Zone refining is based on the principle of
Addition of high proportions of m anganese makes steel useful in m aking rails of railroads, because manganese
(I) gives hardness to steel
(II) helps the forri^tion of oxides of iron
(III) can remove oxygen and sulphur
(IV) can show highest oxidation state of +7
Among the following group of oxides, the group that cannot be reduced by carbon to give the respective metals
Selection of temperature to carry out a reduction process depends so as to make
The common impurities present in the bauxite ore are
The major role of fluorspar (CaF2) which is added in small quantity in the electrolytic reduction of alumina dissolved in fused cryolite (Na3AIF6) is/are
Which of the following is not the correct process ?
In the extraction of Ag and Au using a KCN solution, cyanide ions react with metal ions as
Which of the following are Incorrectly matched ?
Which of the following minerals do not contain lead ?
Spiegel (or) spiegeleise'n, used in the manufacture of steel by the Bessemer process, is an alloy of
Among the following statements the incorrect one is
In the commercial electrochemical process for aluminium extraction the electrolyte used is
The metal that cannot be obtained by electrolysis of an aqueous solution of its salt is
When a metal is precipitated by adding a more electropositive metal, then the process is called
In the extraction of lead the Parke’s process is used to remove the metal
In which of the following isolations no reducing agent is required ?
Which of the following reaction(s) does not occur in Bessemers convertor ?
Refactory materials are generally used in furnaces because
In the leaching of Ag2S with NaCN , a stream of air is also passed. It is because of
Which is used to extract zinc?
Identify x, y, z in the following process ; Metal sulphid impure metal pure metal
Element carbon is most likely to reduce Fe2O3 in which of the following temperature ranges ?
The reverberatory furnace used for preparation of wrought iron, its hearth is lined with
The electrolyte used in Castner’s process of sodium extraction is