Chemistry Question Bank

Assertion: In the electrolytic reduction of Al2O3, cryolite is used. Reason: Cryolite is an ore of aluminium.

Assertion: Wrought iron is more malleable and ductile than steel. Reason: It contains slightly less percentage of carbon.

Assertion: In the extraction of Ag, complex Na [Ag (CN)2] is reacted with Zn. Reason: Zn is d-block transition metal.

Assertion: Thermite mixture Fe2O3+ Al (powder) is used in the welding. Reason: Al is a good reductant.

Assertion: Ores are generally converted into oxides, prior to reduction. Reason: Metal oxides can be easily reduced.

Assertion: In froth flotation process sodium ethyl xanthate is used as collector. Reason: Sulphide ores are water soluble.

Which of the following statements is correct about [Y]?

Assertion: Cryolite is used in electrolytic extraction of Al from alumina. Reason: It dissolves alumina.

Assertion: Extraction of iron metal from iron oxide ore is carried out by heating with coke. Reason: The reaction, Fe O (s) Fe(s)+ O (g) -> is a spontaneous process.

During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’. These are

Which of the following reactions does not occur in Bessemer converter in the extraction of copper from chalcopyrites?

Refining of impure copper with zinc impurity is to be done by electrolysis using electrodes as Cathode Anode

Silver is extracted from its native ore by:

Which of the following pair of ores cannot be converted into corresponding metals by pyrometallurgy?

Consider the following metallurgical processes: (I) Heating impure metal with CO and distilling the resulting volatile carbonyl (b.p. 430C) and finally decomposition at 1500-2000C to get the pure metal (II) Heating th…

Which of the following is not correctly matched?

The methods chiefly used for the extraction of lead and tin from their ores are respective

Boron can be obtained by various methods but not by:

Select correct statement:

Among the following statements, the incorrect one is:

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly

Formation of metallic copper from the sulphide ore in the commercial metallurgical process involves. (a) Cu S+ O Cu O+SO ; Cu O+C 2Cu+CO -> -> (b) Cu S O Cu O SO ; 2Cu O Cu S 6Cu SO -> -> (c) Cu S 2O CuSO ; CuSO C…

The metal ores [X] and [Y] are respectively:

Which of the following has maximum iron content? (AIIMS 2019)

Identify the correct statement from the following: (NEET 2020)