The metal whose oxide can be reduced by common reducing agents: (a) Copper (b) Sodium (c) Aluminium (d) Potassium

The compound that is not an ore of aluminium: (a) Cryolite (b) Corundum (c) Fluorspar (d) Bauxite

A mineral from which a metal can be extracted economically is called: (a) Matrix (b) Ore (c) Flux (d) Alloy

Which of the following is not a constituent of the electrolytic mixture in the Hall-Heroult process? (a) Al₂O₃ (b) NaAlO₂ (c) Na₃AlF₆ (d) CaF₂

Copper, Zinc and Tin are the metals alloyed to form: (a) Duralumin (b) Brass (c) Bronze (d) Solder

In the electrolysis of molten aluminium oxide for extraction of aluminium, the following reactions take place: 1. 2. 3. 4. The reaction that takes place at the negative electrode is: (a) 1 (b) 2 (c) 3 (d) 4

Answer the following questions with reference to the concentration of bauxite ore. (a) Name the process used to concentrate the ore. (b) Give a balanced chemical equation for the conversion of aluminium hydroxide to pure alumina.

Complete the following sentences by choosing the correct word(s) from the brackets: (a) ............... solution forms a coloured precipitate with ammonium hydroxide which is soluble in excess of ammonium hydroxide. [Ferrous chloride / Copper nitrate] (b) Zinc blende is converted to zinc oxide by ................ [Calcination / Roasting] (c) ............... conducts electricity by the movement of ions. [Molten iron / Molten sodium chloride] (d) The reaction that takes place at the anode during the electrolysis of aqueous Sodium argentocyanide with silver electrodes is ................ [Ag ⟶ Ag+ + e-/ Ag+ + e- ⟶ Ag] (e) The salt formed when ZnO reacts with hot concentrated NaOH is ............... . [sodium zincate / zinc hydroxide]

Arrange the following as per the instruction given in the brackets: (a) Al, K, Mg, Ca (decreasing order of its reactivity) (b) N, Be, O, C (increasing order of non-metallic character) (c) P, Si, F, Be (decreasing order of valence electrons)

Write one use of the following alloys: (a) Bronze (b) Fuse metal

Complete the following sentences by choosing the correct answer from the brackets: (a) The salt that can be prepared by Direct Combination is ............... . [FeCl3 / FeCl2] (b) The metallic oxide which can be reduced by using common reducing agents is ............... . [Fe2O3 / Al2O3] (c) The metal nitrate which on thermal decomposition forms a black residue is ............... . [zinc nitrate / copper nitrate] (d) During the electrolysis of copper sulphate solution, if ............... is used as electrodes, the colour of the electrolyte does not fade. [copper / platinum] (e) The process of heating the concentrated ore in a limited supply or absence of air is ............... . [roasting / calcination]

Identify the alloy in each case from the given composition: (a) Aluminium, magnesium, manganese, copper (b) Iron, nickel, chromium, carbon