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Conversion of sulphide ore into an oxide...

Conversion of sulphide ore into an oxide by heating in excess of air is called……….. .

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Calcination is the process of converting an ore into its oxide by heating it in the limited /excess air.

the reaction in which heat is absorbed is called ……………….reaction.

Why are sulphide ores converted to oxide before reduction ?

Name the sulphide ores of (i) zinc (ii) lead .

MODERN PUBLICATION-METALS AND NON-METALS-EXERCISE
  1. Name two metals which are found in nature the free state.

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  2. The rockey material found with ores is known as…………….

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  3. Conversion of sulphide ore into an oxide by heating in excess of air i...

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  4. Froth floatation process is used for the concentration of ……………..ores.

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  5. Cinnabar is an ore of

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  6. Name the substance oxidised, reduced, oxidising agent, reducing agent ...

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  7. Name two metals which are not corroded easily

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  8. What is rusting? What is the chemical formula of rust?

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  9. Percentage of gold in 18 carat gold is:

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  10. Name two conditions necessary for rusting of iron.

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  11. What is the composition of bronze metal alloy?

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  12. Which is the common metal in brass and bronze?

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  13. Which is the common consitutent of all amalgams?

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  14. How will you convert 24 carat gold into 22 carat gold for making ornam...

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  15. Name the consituents of stainless steel.

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  16. Decide the following pairs will react. If they react complete the rea...

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  17. Decide which of the following pairs will react. If they react complete...

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  18. Decide which of the following pairs will react. If they react complete...

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  19. Decide following pair will react. If they react complete the reaction...

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  20. Decide the following pair will react. If they react complete the react...

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