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Answer the following questions based on the ectraction of aluminium from alumina by Hall - Heroult's Process.
What is the function of cryolite used along with alumina as the electrolyte.

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Cryolite `(Na_(3)AlF_(6))` is mixed with alumina to bring down the melting point of electrolyte mixture and to increase its electrical conductivity.
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ICSE-SAMPLE PAPER 2019-SECTION-II (40 Marks) Attempt any four questions from this Section
  1. Name the organic compounds : The compound that reacts with acetic ac...

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  2. Name the following organic compounds: i]. The compound with 3 carbon...

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  3. Give the chemical formula of : (i) Bauxite (ii) Cryolite (iii) Sodium ...

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  4. Give the chemical formula of : (i) Bauxite (ii) Cryolite (iii) Sodium ...

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  5. Give the chemical formula of : (i) Bauxite (ii) Cryolite (iii) Sodium ...

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  6. Answer the following questions based on the ectraction of aluminium fr...

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  7. Answer the question based on the extraction of aluminium from alumina ...

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  8. Answer the question based on the extraction of aluminium from alumina ...

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  9. Match the alloys given in column I to the uses given in column II.

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  10. Identify the substance italicised : The catalyst used to oxidise ammon...

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  11. Identify the substance italicised: The organic compound which when sol...

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  12. Identify the substance italicised : The dilute acid which is a oxidiz...

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  13. Copper sulphate solution reacts with sodium hydroxide solution to form...

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  14. Copper [II] sulphate solution. Reacts with sodium hydroxide solution t...

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  15. Find the empirical formula and the molecular formula of an organic com...

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  16. Name the gas evolved when : Alumina undergoes electrolytic reduction.

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  17. Name the gas evolved: Ethene undergoes hydrogenation reaction.

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  18. Name the gas evolved in the case : Ammonia reacts with heated coppe...

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  19. Study the flow chart given and give balanced equations to represent th...

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  20. Give the preparation reaction of Ammonia.

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