Describe how the following changes are brought about:
(i)Pig iron into steel.
(ii)Zinc oxide into metallic zinc.
(iii)Impure titanium into pure titanium.

(a) Illustrate the following name reactions giving a chemical equations in each case : (i) Clemmensen reaction (ii) Cannizzaro's reaction (b) Describe how the following conversions can be brought about : (i) Cyclohexanol to cyclohexan 1 - one (ii) Ethylbenzene to benzoic acid (iii) Bromobenzene to benzoic acid

Describe the role of the following : (i) NaCl in the extraction of silver from a silver ore (ii) Iodine in the refining of titanium (iii) Cryolite in the metallurgy of aluminium

Amongest the following, how many ores are roasted to convert them into their corresponding metal oxides, alumina, zinc blende, iron pyrites, copper pyrites, galena.

Explain the role of each of the following in the extraction of metals from their ores : (i) CO in the extraction of nickel. (ii) Zinc in the extraction of silver. (iii) Silica in the extraction of copper.

Which of the following changes take place during roasting ? (i) Impurities are removed as they form volatile oxides. (ii) Ore is converted into their volatile oxides. (iii) Changes like oxidation , chlorination, etc. take place

Write equations for the following reactions : (i) Zinc blende is heated in air (ii) Zinc carbonate is heated in the absence of air (iii) Mangnese dioxide is heated with aluminium powder

Write balanced chemical equation for the reactions taking place when (i) Zinc carbonate is calcinated. (ii) Zinc sulphide is roasted or heated in air. (iii) Zinc oxide is reduced to zinc.

Which of the following metals can be used for liberating hydrogen from dilute hydrochloric acid ? (i) Zinc (ii) Copper (iii)Iron (iv) Silver (v) Magnesium

Which of the following reaction cannot take place ? Justify your answer. (i) Iron + zinc sulphate to Iron sulphate + Zinc (ii) Magnesium + Silver nitrate to Magnesium nitrate +Silver (iii) Copper + dil. sulphuric acid to Copper sulphate + Hydrogen (iv) Zinc + ferrous sulphate to Iron + zinc sulphate

Write the balance chemical equations for the following chemical reactions : (i) Hydrogen + Chlorine to Hydrogen chloride. (ii) Lead + Copper chloride to Lead chloride + Copper (iii) Zinc oxide + Carbon to Zinc + Carbon monoxide.