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Explain why invar is used for making met...

Explain why invar is used for making meter scale.

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Invar has very low coefficient of expansion and hence, used for making meter scale.
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CHHAYA PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS-QUESTION - ANSWER ZONE FOR BOARD EXAMINATION (VERY SHORT ANSWER TYPE )
  1. Explain why the concentraction of the sulphide ore is usually carried ...

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  2. Name the chief ores of Cu, Fe and Al. What are the methods employed fo...

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  3. Metal sulphides occur mainly in rocks and metal halides in lakes and s...

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  4. Write the name of a suitable flux to remove SiO(2) present as gangue.

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  5. How are the elements occupying higher positions of the electrochemical...

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  6. Out of C and CO, which is a better reducing agent for FeO in the lower...

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  7. CO cannot be used for the reduction of ZnO- why?

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  8. How cany the feasibility of reduction of a metal oxide by a metal be p...

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  9. Name an alloy of Cu that is used for making utensils.

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  10. Name the gas used for the separation of Ni from impurities by Mond pro...

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  11. Explain why invar is used for making meter scale.

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  12. What is copper matte?

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  13. Name the anode used in electrolytic refining of Cu?

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  14. How can a small amount of Cd be removed from zinc?

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  15. Arrange in the order of increasing carbon content: wrough iron, cast i...

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  16. What is the principle of zone refining?

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  17. Limestone is used in the preparation of pig iron from haematite - why?

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  18. What is pyrometallurgy?

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  19. Is carbon a satisfactory reducing agent for all metal oxides ? Explain...

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  20. What do you mean by 'tempering of steel'?

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