Chemistry
Name the following:
(a) A metal which is found abundantly in the Earth's crust.
(b) The process used for the enrichment of sulphide ore.
(c) A metal present in cryolite other than sodium.
(d) A metal which is unaffected by dilute or concentrated acids.
(e) A metal present in period 3, group 1 of the periodic table.
(f) The property possessed by metals by which they can be beaten into sheets.
(g) A compound added to lower the fusion temperature of electrolytic bath in the extraction of aluminium.
(h) The ore of zinc containing its sulphide.
(i) The solution used to react with Bauxite as a first step in obtaining pure aluminium oxide, in the Baeyer's process.
(j) The compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.
Related Questions
Fill in the blanks :
(a) During the concentration of bauxite ore, aluminium goes in …………… (soluble/insoluble) part because of its …………… (acidic/basic/amphoteric) nature.
(b) In Hoope's process, pure aluminium is collected at the …………… (top/bottom) of the electrolytic cell.
(c) Usually …………… (sulphide/carbonate) ores are subjected to …………… (calcination/roasting) which is done in the absence of air
(d) Zinc blende is converted to oxide by …………… (roasting/calcination) process.
(e) Froth floatation process is generally used to concentrate …………… ores (sulphides/carbonate)
Given below in column A is a schematic diagram of the electrolytic reduction of alumina. Identify the parts labelled as A, B and C with the correct options from the Column B.
Choose the most appropriate answer from the following list of oxides which fit the description. Each answer may be used only once:
[SO2, SiO2, Al2O3, MgO, CO, Na2O](i) A basic oxide
(ii) An oxide which dissolves in water forming an acid
(iii) An amphoteric oxide.
(iv) A covalent oxide of a metalloid
State the main components of the following alloys :
(i) Brass
(ii) Duralumin
(iii) Bronze.