Q15 of 40 Page 1

What is the role of coke in the extraction of iron from its oxides?

The role of coke in the extraction of iron from its oxides is that it reduces the iron oxide to molten iron metal. Coke also when burnt in the blast furnace, supplies the heat required for carrying out the extraction of iron from its oxide.

FeO + C→ Fe + CO


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15

Name the method of refining of metals such as Germanium.

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In the extraction of impure is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?

 16

Calculate e.m.f of the following cell at 298 K:


Given:


 17

Give reasons:

Mn shows the highest oxidation state of +7 with oxygen but with fluorine it shows the highest oxidation state of +4