Hydrogen gas is not widely used as a reducing agent because

hydrogen decomposes to atomic hydrogen at higher temperature.

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hydrogen isomerises to ortho hydrogen at a higher temperature..

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many metals form hydrides at lower temperature.

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there is a risk of an explosion from oxygen and hydrogen in air.

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Solution

The correct option is D there is a risk of an explosion from oxygen and hydrogen in air.
Hydrogen gas reacts with oxygen to form water and the reaction takes place with an explosion.

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Metals higher in the reactivity series replace hydrogen from its acid to form the corresponding hydroxides and hydrogen gas.

Although carbon and hydrogen are better reducing agents but they are not used to reduce metallic oxides at high temperatures. Why?

\begin{matrix} C o l u m n - I & C o l u m n - I I (a) & E l e c t r o l y s i s o f w a t e r p r o d u c e s & (p) & A t o m i c r e a c t o r (b) & L i t h i u m a l u m i n i u m h y d r i d e i s u s e d a s & (q) & P o l a r m o l e c u l e (c) & H y d r o g e n c h l o r i d e i s a & (r) & C o m b i n e s o n m e t a l s u r f a c e t o g e n e r a t e h i g h t e m p e r a t u r e (d) & H e a v y w a t e r i s u s e d i n & (s) & R e d u c i n g a g e n t (e) & A t o m i c h y d r o g e n & (t) & H y d r o g e n a n d o x y g e n \end{matrix}

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