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True or false statements : (i) Sodium ...

True or false statements :
(i) Sodium cyanide is used as a depresent to separate lead sulphide from zinc sulphide.

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The correct Answer is:
1
`ZnS` dissolves in `NaCN` to form the soluble complex.
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Name the sulphide ores of (i) zinc (ii) lead.

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Given below are two statements : Statement I : Sphalerite is a sulphide ore of zinc and copper glance is a sulphide ore of copper. Statement II : It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants' in a froth flotation method. Choose the most appropriate answer from the options given below :

Mark 'T' if the statement is true and 'F' if it is false. Copper displaces zinc from zinc sulphate solution.

Sodium cyanide solution is used to extract _____or _____from its ores.

CENGAGE CHEMISTRY-GENERAL PRINCIPLES AND PROCESS OF ISOLATION OF ELEMENTS-Exs 1.1 (True Orfalse Statement)
  1. True or false statements : (i) Sodium cyanide is used as a depresent...

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  2. (ii) Iron can reduce alumina to aluminium metal.

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  3. (iii) Substances which convert infusible impurities present in ores in...

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  4. (iv) Zirconium is best refined by zonc refining method.

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  5. (v) Impurties are more soluble in the melt than in the solid state of ...

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  6. (vi) In Bessenmerisation of sulphide ore of copper, there is self-redu...

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  7. (vii) Mercury is transported on containers made of iron.

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  8. (viii)The ore CuFeS(2) is used to extract iron metal.

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  9. (ix) It is possible to extract a metal from its oxide it the free ener...

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  10. Fill in the blanks : (a) Pig iron in manufactured by using furnace.

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  11. (b) Platinum, indium etc. are known as noble metals because they are t...

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  12. ( c) iron is the purest form of iron.

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  13. (d) Passivity of iron is due to the formation of thin film of on its s...

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  14. ( e) Phenimenon of removing layers of basic oxides from metals before ...

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  15. (f) In the manufacture of iron from haematite, limestone is added to a...

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  16. (g) An ore of tin containing FeCrO(4) is concentrated by .

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  17. (h) In froth process, the ore particles float because their surface is...

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  18. Coating of zinc on iron objects is commonly known as .

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  19. In electrorefining, the impure metal is made .

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