19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following has maximum iron content? (AIIMS 2019)
Among the following, the most abundant metal in the earth’s crust is
The impurities present in a mineral are called
Which of the following statements is correct?
An element whose electronic configuration is 4s13d10. The possibility of element is
Identify the correct statement from the following: (NEET 2020)
Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature? (NEET 2021)
The maximum temperature that can be achieved in blast furnace is: (NEET 2021)
The two most abundant metals in the earth crust are:
The chemical composition of ‘slag’ formed during the smelting process in the extraction of copper is
Carbonate of which of the following metal does not liberate carbon dioxide on heating:
Among the following statements, the incorrect one is:
The major role of fluorspar (CaF2) which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite (Na3AlF6) is
Select correct statement:
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…
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: