19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Assertion: Lead, tin and bismuth are purified by liquation method. Reason: Lead, tin and bismuth have low m.p. as compared to impurities.
Assertion: Wrought iron is more malleable and ductile than steel. Reason: It contains slightly less percentage of carbon.
Assertion: In the electrolytic reduction of Al₂O₃, cryolite is used. Reason: Cryolite is an ore of aluminium.
Assertion: CuFeS₂ is concentrated by froth floatation method. Reason: CuFeS₂ is main ore of copper.
Assertion: Cryolite is used in electrolytic extraction of Al from alumina. Reason: It dissolves alumina.
Assertion: In froth flotation process sodium ethyl xanthate is used as collector. Reason: Sulphide ores are water soluble.
Assertion: Thermite mixture Fe₂O³⁺ Al (powder) is used in the welding. Reason: Al is a good reductant.
Assertion: In the extraction of Ag, complex Na [Ag (CN)₂] is reacted with Zn. Reason: Zn is d-block transition metal.
Assertion: In the electrolytic reduction of Al₂O₃, cryolite is used. Reason: Cryolite is an ore of aluminium.
Assertion: CuFeS₂ is concentrated by froth floatation method. Reason: CuFeS₂ is main ore of copper.
Assertion: Cryolite is used in electrolytic extraction of Al from alumina. Reason: It dissolves alumina.
Assertion: In froth flotation process sodium ethyl xanthate is used as collector. Reason: Sulphide ores are water soluble.
Assertion: Thermite mixture Fe₂O³⁺ Al (powder) is used in the welding. Reason: Al is a good reductant.
Assertion: In the extraction of Ag, complex Na [Ag (CN)₂] is reacted with Zn. Reason: Zn is d-block transition metal.
Assertion: Ores are generally converted into oxides, prior to reduction. Reason: Metal oxides can be easily reduced.
Which of the following statements is correct about [Y]?
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: All the ores are mineral. Reason: Ores contains metals in combined state
Assertion: Lead, tin and bismuth are purified by liquation method. Reason: Lead, tin and bismuth have low m.p. as compared to impurities.
Assertion: Wrought iron is more malleable and ductile than steel. Reason: It contains slightly less percentage of carbon.
The chemical composition of ‘slag’ formed during the smelting process in the extraction of copper is
Boron can be obtained by various methods but not by:
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 Cu S 3Cu …