Chemistry Question Bank

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…

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…

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

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

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?

Silver is extracted from its native ore by:

Which of the following is not correctly matched?

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

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

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

Assertion: Al2O3 is converted into Al by reduction with carbon at high temp. Reason: Carbon has greater affinity for oxygen than aluminium.

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

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

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

Assertion: Lead, tin and bismuth are purified by liquation method. Reason: Lead, tin and bismuth have low m.p. as compared to impurities.

Assertion: All the ores are mineral. Reason: Ores contains metals in combined state

Calculate the OH– ion concentration of NaOH of which pH is 12.

The solution of hydrochloric acid has pH = 4, the molar strength of this solution is

The number of H+ in 1 cc of solution of pH = 13 is