Question

11. Can copper and aluminium be refined electrolytically?
12. Name one liquid metal and one liquid nonmetal found at room temperature,
13. Give chemical equation of the following reactions:
(a) Potassium with water
(b) Hotiron with steam
14. Iqbal treated a lustrous, divalent element M with sodium hydroxide. He obl
served the formation of bubbles in reaction mixture. He made the same obser
vations when this element was treated with hydrochloric acid. Suggest how can
he identify the produced gas. Write chemical equations for both the reactions.
15. Define 'malleability' and ductility' of a metal.
16. Though aluminium is a good conductor of heat, aluminium foils are used for
packing hot food material. Why?
17. A metal that exista as a liquid at room temperature is obtained by heating its
sulphide in the presence of air. Identify the metal and its ore and give the react
tion involved.
18. Ametal X used in thermite process gets heated with oxygen to give an oxide Y
which is amphoteric in nature. Name X and Y. Mention the reactions of oxide of
Y with HCl and NaOH.
19. The reaction between metals like sodium, magnesium and iron with air and wat
ter indicates their relative positions in the reactivity series'. Is this statement
true? Justify your answer with examples.
20. (a) Differentiate between 'roasting' and calcination'. Which of the two is used
for sulphide ores, and why?
(b) Write a chemical equation to show the use of aluminium in joining or solder-
ing cracks in railway lines.
(c) Name the anode, cathode and electrolyte used in refining of copper.​

Answer 1

Answer:

after reading whole question I will replay it.