Question

(a) Name the metal which is extracted from the ore called ‘rock salt’.
(b) Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
(c) Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
(d) In the electrolytic refining of a metal M, what would you take as anode, cathode and electrolyte ?
(e) Name any five metals which are purified by electrolytic refining method.

Lakhmir Singh Chemistry Class 10

Answer 1

Answer:

a. sodium is the metal which is extracted from the ore called rock salt

Answer 2

Explanation:

(a) Name the metal which is extracted from the ore called ‘rock salt’ - Sodium

(b) Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae -

- Zinc blende; Zinc sulphide, ZnS

- Calamine; Zinc carbonate, ZnCO3

(c) Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved - Mercury sulphide ore is roasted in air when mercury oxide is formed. The reaction that takes place is -

2Hgs + 302 →→ 2Hgo + 2SO2

(d) In the electrolytic refining of a metal M, what would you take as anode, cathode and electrolyte  -

Anode – A thick block of impure metal M

Cathode – A thin strip of pure metal M

Electrolyte – A water soluble salt of metal M

(e) Five metals which are purified by electrolytic refining method - Copper, Nickel, Zinc, Gold and Silver.