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Class 12
CHEMISTRY
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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Text Solution

Verified by Experts

The correct Answer is:
1
`ZnS` dissolves in `NaCN` to form the soluble complex.

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फ़ेन प्लवन विधि में जिंक सल्फ़ाइड और लेड सल्फाइड को पृथक किया जा सकता है

What are depressants ? How would you separate zinc sulphide (ZnS) and lead sulphide (PbS) ores ?

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

फेन प्लवन विधि में जिंक सल्फाइड और लेड सल्फाइड को पृथक किया जा सकता है

State whether the statement is true or false- Lunar caustic is the commercial name of zinc sulphide.

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...

    01:20

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

    01:12

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

    01:00

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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...

    01:03

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

    00:58

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

    00:54

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

    01:25

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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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