Chemistry
(a) Mayank extracts aluminium by electrolytic process. Answer the following questions with respect to the electrolytic process in the extraction of aluminium.
(1) A compound which is added to lower the fusion temperature of the electrolytic bath.
(2) Explain, why powdered coke is sprinkled over the electrolytic mixture?
(b) The atomic number of an element is 16. To which group will this element belong to?
Metallurgy
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Answer
(a) Cryolite [Na3AlF6]
(b) The layer of powdered coke is sprinkled over the electrolytic mixture as :
- It prevents burning of carbon electrodes in air at the emergence point from the bath.
- It minimizes or prevents heat loss by radiation.
(c) The element belongs to group 16 [VI A].
Reason — The element Z has atomic number 16 and so the electronic configuration will be 2, 8, 6. The number of valence electrons determine the group of the element. Hence, Z will belong to group 16 [VI A] as it has 6 electrons in the valence shell.
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