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Explain manufacture of nitric acid by Os...

 Explain manufacture of nitric acid by Ostwald's process.

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(1)Ammonia is oxidized by air in the presence of Pt-Rh gauze catalyst at 500K under 9 bar pressure to give Nitric oxide.
`4NH,_(3)+ 5O_(2) overset("Pt-Rh gauze") underset("500k,9 bar") to4NO+6H_(2)O`
(2) The nitric oxide is oxidised by air below `100^(@)C` to give nitrogen dioxide `2NO+O_(2)to2NO_(2)`
(3) Nitrogen dioxide is then converted to nitric acid by absorbing `NO_(2)` in water. `3NO_(2) +H_(2)O to 2HNO_(3) + NO`
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