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The catalysts which can be used in the manufacture of `H_2SO_4` are
A. Oxides of nitrogen
B. `V_2O_5`
C. Platinised asbestos
D. Fe + Mo.

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Correct Answer - A::B::C::D
`2SO_2 + O_2 hArr 2SO_3`
This reaction can be catalysed by oxides of nitrogen, `V_2O_5` and platinised asbestos. This reaction cannot be catalysed by Fe + Mo.

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