Nitric acid is the most important oxyacid formed y nitrogen .It is one of the major industial chemicl and is widely used. Nitric acid is manufactured by the catalytic oxidation of ammonia in what is known as OSTWALD PROCESS which can be represented by the sequenve of reactions shown below:
`4NH_(3)(g) +5O_(2)(g) underset("Catalyst")overset(Pt//Rh)rarr 4NO(g)+6H_(2)O(g) " "...(i)`
`2NO(f) + O_(2)(g) overset(1120 K) rarr 2NO_(2)(g)" "...(ii)`
`3NO_(2)(g)+H_(2)O(l) rarr 2HNO_(3)(aq)+NO(g)" "...(iii)`
The aqueous nitric acid obtained by this method can be concentrated by distillation to ~ 68.5 % by weight . Further concentrated to 98% acid can be achieved by dehyration with concentrated sulphuric acid.
85 kg of `NH_(3)(g)` was heated with 320 kg oxygen in the first step and `NHO_(3)` is prepared according to the above reactions . If the above reactions . If the final solution has volume 500 L ,then molarity of `HNO_(3)` is :
[Assume NO formed finally is not reused]
A. 2 M
B. 8 M
C. 3.33 M
D. 6.66 M
