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05/11/2020 5:16 pm
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(a) The reaction of metal (X) with ferric oxide is highly exothermic. Metal (X) is obtained from its oxides by electrolytic reduction. Identify (X) and write its reaction with ferric oxide.
(b) Give reason to justify that aluminium oxide is an amphoteric oxide. Also, give another example of amphoteric oxide.
(c) Mention constituent metals present in bronze.
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05/11/2020 5:20 pm
(a) ‘X’ is ‘Al’
2Al + Fe2O3 → Al2O3 + 2Fe
(b) Al2O3 reacts with acid as well as base therefore it is amphoteric oxide.
Al2O3 + 2NaOH → 2NaAlO2 + H2O
Al2O3 + 6HCl → 2AlCl3 + 3H2
Zinc oxide is also an amphoteric oxide.
(c) Bronze contains’ copper and tin.