QQuestion
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]
✓Answer
(a) The salt that can be prepared by Direct Combination is FeCl3.
(b) The metallic oxide which can be reduced by using common reducing agents is Fe2O3.
(c) The metal nitrate which on thermal decomposition forms a black residue is copper nitrate.
(d) During the electrolysis of copper sulphate solution, if copper is used as electrodes, the colour of the electrolyte does not fade.
(e) The process of heating the concentrated ore in a limited supply or absence of air is calcination.
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