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What is "Spiegel" ? When is it used ?...

What is "Spiegel" ? When is it used ?

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It is an alloy of iron with 5-15% manganese and 60% of carbon. It is added to remove oxygen left in steel from the blast of air and thus to prevent the formation of blow holes.
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ICSE-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) (VERY SHORT ANSWER QUESTIONS)
  1. Which metals are present in Haemoglobin

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  2. Name the elements which are recovered commercially from sea water.

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  3. What is "Spiegel" ? When is it used ?

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  4. Name a noble metal and a metalloid.

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  5. Give one example each of a liquid metal and a noble metal.

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  6. Why is zinc not extracted from zinc oxide through reduction using CO?

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  7. Write chemical reactions taking place in the extraction of zinc from z...

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  8. Which metal is used to protect the iron sheets from rusting by a proce...

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  9. How is galena (PbS) present as impurity removed from the ore of zinc b...

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  10. Write a balanced equation for the reaction of argentite with KCN and n...

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  11. In moist air, copper corrodes to produce a green layer on the surface....

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  12. In which of the following cases flux is required? (i) In the smelti...

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  13. What is anode mud" in connection with the metallurgy of copper? What i...

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  14. What is the percentage of silver in German silver'?

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  15. Arrange in descending order of carbon content: Stainless steel, mild s...

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  16. Name a metal which may be extracted from the respective ore by both el...

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  17. What is the composition of Copper matte.

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  18. What is meant by self-reduction process?

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  19. An ore sample of galena (PbS) is contaminated with zinc blende (ZnS). ...

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  20. The extraction of Au by leaching with NaCN involves both oxidation and...

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