In the extraction of metal by the process of electrolysis at which electrode does the following reaction occur ? M+ + e− ⇌ M (M = Metal) Is it an oxidation or a reduction reaction? Answer with reason. OR Mention one use of aluminium. Why acidic foods should not be kept in an aluminium container?

Which of the following is the formula of zine blende, an ore of zinc? ZnO Zns ZnCO3 InSO4

Why is dehydrated calcium chloride added during the extraction of sodium through electrolysis of sodium chloride ? OR Mention two ways of preventing the rusting of iron.

Match the Right column with the Left column: [1 × 4] Left column Right column 2.11.1. An alkaline earth metal (a) Fe 2.11.2. The metal which is present in the highest percentage amount in the alloy invar (b) Zn 2.11.3. An alkali metal (c) Ca 2.11.4. The metal which is given as coating to prevent the rusting of iron (d) K

The metal which is extracted through thermal reduction is (a) Ag (b) Mg (c) Fe (d) Au

What reaction occurs at the cathode in the electrolyte method of extraction of aluminium? [1] OR Write whether the following statement is True or False: [1] Free electrons carry electricity through electrolytic substances.

Why does a copper vessel turn green in open air?

Name the metal which is extracted in thermite process.

Which of the following is an ore of Aluminium? (a) Hematite (b) Bauxite (c) Malachite (d) Chalcocite

Which of the following elements is not present in Duralumin? (a) Al (b) Zn (c) Cu (d) Mg

Match the right column with the left column: Left Column Right Column 2.11.1. Noble Gas (a) Cs 2.11.2. Inver (b) Rn 2.11.3. Least electronegative element (c) Reduction with carbon 2.11.4. ZnO + C → Zn + CO (d) An alloy

In the extraction of aluminium by electrolysis, what substances are present in the molten mixture besides pure alumina? What are used as the cathode and anode in this electrolysis? [2+1]