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Question

Large-scale manufacture of nitric acid by Ostawald process utilizes the reaction-

A
2NaNO3+H2SO4Na2SO4+2HNO3
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B
4NH3+5O24NO+6H2O
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C
NO+2+NO3+H2O2HNO3
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D
2NO+O2+H2OHNO3+HNO2
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Solution

The correct option is B 4NH3+5O24NO+6H2O
The balanced chemical equation involved in manufacturing of HNO3 by Ostwald's process are shown as:

Step 1 Formation of nitric oxide (NO)
4NH3(g)+5O2(g)Pt/Rh, gases~ catalyst−−−−−−−−−−−−500K, 9bar4NO(g)+6H2O

Step 2 Formation of nitrogen dioxide (NO2)
2NO(g)+O2(g)2NO2(g)

Step 3 Absorption of NO2 (Formation of HNO3)
3NO2(g)+H2O2HNO3(l)+NO(g)
Therefore, the correct option is (b).

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