General Principles and Processes of Isolation of Elements

Bihar Board Class 12 · Chemistry · 35 past questions

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1. Q1 2026 Set A

   Which of the following metals is extracted by leaching the ore with dilute cyanide solution ?

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2. Q2 2026 Set A

   The main constituent of bones is

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3. Q3 2026 Set A

   Which of the following metals is not extracted by the eletrolysis of its ore ?

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4. Q4 2025 Set D

   Impurities present in an ore are called

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5. Q5 2025 Set D

   The process of purification of metal represented by the following equation is called…

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6. Q6 2025 Set D

   Which of the following metals is not obtained by electrolysis ?

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7. Q7 2024 Set D

   Which of the following metals is generally found in free state ?

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8. Q9 2024 Set D

   Electrometallurgical process is used for the extraction of which of the following metals ?

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9. Q11 2023 Set F

   The important oxide ore of iron is

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10. Q12 2023 Set F

    Pyrolusite is an ore of which of the following ?

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11. Q13 2023 Set F

    The process of reduction of a metal oxide by carbon or carbon monoxide to the metal is called

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12. Q14 2023 Set F

    Cyanide process is used for the extraction of which of the following metals ?

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13. Q15 2022 Set E

    Sulphide ores are generally concentrated by which of the following ?

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14. Q16 2022 Set E

    Which of the following metals is not extracted by the process of electrolysis ?

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15. Q17 2022 Set E

    Which of the following metals is purified by Hoope's process ?

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16. Q18 2022 Set E

    The most abundant metal in earth crust is

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17. Q19 2021 Set A

    The formula of copper pyrite is

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18. Q20 2021 Set A

    Sulphide ores are concentrated by

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19. Q21 2021 Set A

    The metal always found in free state is

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20. Q22 2021 Set A

    Which of the following has magnesium ?

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21. Q23 2021 Set A

    Galena is an ore of

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22. Q24 2019 Set D

    Copper metal is purified by which of the following method -

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23. Q25 2019 Set D

    Chief ore of Iron is -

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24. Q26 2019 Set D

    A process of heating ore of a metal in excess of air below its melting point is called -

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25. Q27 2017

    Sulphide ores are generally concentrated by –

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26. Q28 2017

    Give the name and chemical composition of important ores of aluminium and Copper.

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27. Q29 2016

    Cinnabar is

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28. Q30 2016

    Element found from sea water is

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29. Q31 2015

    Main source of helium is

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30. Q32 2015

    Concentration of sulphide ore is done by

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31. Q33 2015

    Most abundant element in earth's crust is

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32. Q34 2015

    Malachite is an ore of

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33. Q35 2015

    Formula of copper pyrite is

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