Related InterviewSolutions

• Match the following choosing one item from Column X the appropriate item from Column Y. `{:("Column X","Column Y"),(a."Al",p. "Calamine"),(B."Cu",q. "Cryolite"),(C."Mg",r. "Malachite"),(D. "Zn",s."Carnalite"):}`
• The coordination number of `Al` in the crystalline state of `AlCl_(3)` is _____.
• Iron is rendered passive by treatment with concentratedA. `H_(2)SO_(4)`B. `H_(3)PO_(4)`C. HClD. `HNO_(3)`
• Upon hetaing with `Cu_(2)S` the regants that give copper metel are (i) `CuFeS_(2)` (ii) `CuO` (iii) `Cu_(2)O`(iv) `CuSO_(4)`A. `CuFeS_(2)`B. CuOC. `Cu_(2)O`D. `CuSO_(4)`
• In the electrolysis of alumina, cryolite is added toA. lower the melting point of aluminaB. increase the electrical conductivityC. minimise the anode effectD. remove impurities from alumina
• Out of the following matals that cannot be obtained by electrolysis of the aquenous solution of their salts isA. AgB. MgC. CuD. Al
• Match the conversions in Column I with the type(s) of reaction(s) given in Column II. `{:("Column I","ColumnII"),(A. "PbS"rarr"PbO",p. "Roasting"),(B. "CaCo"_(3)rarr"CaO",q. "Calcination"),(C. "ZnS"rarr"Zn",r. "Carbon reduction"),(D. "Cu"_(2)"S"rarr"Cu",s. "Self-reduction"):}`
• Copper is the most noble of first row transition metals and occurs in small deposits in serveral countries. Ores of copper include chalcanthite `(CuSO_(4).5H_(2)O)`, atacanite `[Cu_(2)Cl(OH)_(3)]`, cuprite `(Cu_(2)O)`, copper glance `(Cu_(2)S)`, and malachite `[Cu_(2)(OH)_(2)CO_(3)]`. However, `80 %` of the world copper production comes from the ore chalcopyrite `(CuFeS_(2))`. The extraction of copper from chalcopyrite involves partial roasting, removal of iron and self-reduction. Partial roasting of chalcopyrite producesA. `Cu_(2)S` and FeOB. `Cu_(2)O` and FeOC. CuS and `Fe_(2)O_(3)`D. `Cu_(2)O` and `Fe_(2)O_(3)`
• Match list I with list II and select the correct answer using the codes given below the lists. `{:("List I (Ore)","List II (Metal)"),("(i) Dolomite","(ii) Copper"),("(ii) Chalcopyrite","(ii) Lead"),("(iii) Pyrolusite", "(iii) Magnesium"),("(iv) Galena", "(iv) Manganese"):}`A. `{:("(i) (ii) (iii) (iv)"),("III I IV II"):}`B. `{:("(i) (ii) (iii) (iv)"),("III II I IV"):}`C. `{:("(i) (ii) (iii) (iv)"),("I II III IV"):}`D. `{:("(i) (ii) (iii) (iv)"),("IV III II I"):}`
• The chemical composition of slag formed during the smelting process in the extraction of copper isA. `Cu_(2)O+FeS`B. FeSi`O_(3)`C. CuFe`S_(2)`D. `Cu_(2)S` + FeO