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Sylvine is an ore of potassium....

Sylvine is an ore of potassium.

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CENGAGE CHEMISTRY ENGLISH-GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS-Exercise (True/False)
  1. Levigation is generally employed for concentration of sulphide ores.

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  2. Every mineral is an ore, but every ore is not a mineral.

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  3. Slag is a product formed during smelting by combination of flux and im...

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  4. Alkali metals can be obtained by chemical reduction of their compounds...

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  5. Sylvine is an ore of potassium.

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  6. Oxide ore are purified by levigation process.

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  7. During electrorefining of a metal, impure metal is made anode.

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  8. Highly pure metal can be obtained by zone refining

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  9. Aluminium is the most abundant metal in the earth's crust.

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  10. Reactive metals occur in native state.

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  11. The process of calcination and roasting is carried out in reverberator...

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  12. In calcination, ore is heated strongly in the absence of air

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  13. Copper is found both in free as well as in combined state in nature.

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  14. Below 1623 K, Al can reduce MgO to Mg, but above 1623 K, reverse is tr...

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  15. Mond's process is used for purification of titanium.

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  16. KCN forms soluble complex with silver glance.

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  17. Zinc blende on roasting often gives Zn metal.

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  18. Silver is extracted by hydrometallurgy.

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  19. The lining of blast furnace is made up of fire clay bricks.

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  20. Gypsum is an ore of magnesium.

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