Cartain materials such as turpentine oil, unsaturated organic compound, phosophorus, metals such as `Zn`, and `Pb`, etc., can absorb `O_(2)` from air in the presence of `H_(2)O`, which is converted to absorb `O_(2)` from air in the presence of `H_(2)O`, which is converted to `H_(2)O_(2)`. This is called autoxidation. Intermolecular redox reactions are those in which one molecule is oxidised and the other is reduced. Intramolecular redox reactions are those in which oen atom of a molecule is oxidised and the other atom is reduced.
Which of the following reactions is`//`are none of the reactions mentioned in the question?

Options

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)`

Answer

A, B, C, D

Explanation

All are none reactions since in all the reactions the oxidation states of reactant and product do not change.