19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following pair of ores cannot be converted into corresponding metals by pyrometallurgy?
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
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:
Among the following statements, the incorrect one is:
During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’. These are
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…
Carbonate of which of the following metal does not liberate carbon dioxide on heating:
The two most abundant metals in the earth crust are:
Assertion: Al₂O₃ is converted into Al by reduction with carbon at high temp. Reason: Carbon has greater affinity for oxygen than aluminium.
Among the following statements, the incorrect one is:
Carbonate of which of the following metal does not liberate carbon dioxide on heating:
The two most abundant metals in the earth crust are:
During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’. These are
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 statements is correct about [Y]?
The metal ores [X] and [Y] are respectively:
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: 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.
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.