Which of the following reactions is`//`are none of the reactions mentioned in the question?
A. `Ag(NH_(3))^(o+)overset(2H^(o+))rarrAg^(o+)+NH_(4)^(o+)`
B. `Cr_(2)O_(7)^(2-)+2overset(ө)OHrarr2CrO_(4)^(2-)+H_(2)O`
C. `NH_(4)^(o+)rarrNH_(3)`
D. `2NO_(2)rarrN_(2)O_(4)`
Correct Answer – A::B::C::D
All are none reactions since in all the reactions the oxidation states of reactant and product do not change.