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Hydrogen gas is not widely used as a reducing agent because 

A. hydrogen decomposes to atomic hydrogen at higher temperature 

B. risk of explosion with water 

C. hydrogen isomerises to ortho hydrogen at higher temperature. 

D. many metals form hydrides at lower temperatures.

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Many of the metallic oxides react with the hydrogen to form respective hydrides and hence hydrogen is not widely used as reducing agent in metallurgy. 

So the correct answer is d.

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