Q.

The disadvantages of carbon reduction method are

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a

carbon combines with oxygen to form poisonous CO

b

high temperature needed which is expensive and requires the use of a blast furnace

c

many metals combine with carbon forming carbides

d

carbon cannot be used with highly electro-positive metals.

answer is A, B, C.

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Detailed Solution

The most disadvantages of carbon reduction method are:

(i)Carbon forms carbides with many metals such as Al , Ca, Na2C2

(ii) Lot of heat energy is required to melt coke in blast furnace.

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