Chemistry Question Bank

Assertion: CuFeS2 is concentrated by froth floatation method. Reason: CuFeS2 is main ore of copper.

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

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

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

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

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

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

Which of the following is not correctly matched?

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

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

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.

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

Silver is extracted from its native ore by:

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

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…

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…

Select correct statement:

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:

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

The chemical composition of ‘slag’ formed during the smelting process in the extraction of copper is

The two most abundant metals in the earth crust are:

Carbonate of which of the following metal does not liberate carbon dioxide on heating:

Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature? (NEET 2021)

Among the following statements, the incorrect one is: