Chemistry
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]
Acids Bases Salts
ICSE 2024
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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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