Consider the following reactions: (i) (1)/(2)N_(2)(g)+(1)/(2)O_(2)(g) to NO(g),Delta_(r)H^(ө)=90" kJ "mol^(-1) (ii) NO(g)+(1)/(2)O_(2)(g) to NO_(2)(g),Delta_(r)H^(ө)=-74" kJ "mol^(-1) Select the correct statement about the given reaction.

Consider the following reactions: (i) (1)/(2)N_(2)(g)+(1)/(2)O_(2)(g)

1.	Consider the following reactions: (i) (1)/(2)N_(2)(g)+(1)/(2)O_(2)(g) to NO(g),Delta_(r)H^(ө)=90" kJ "mol^(-1) (ii) NO(g)+(1)/(2)O_(2)(g) to NO_(2)(g),Delta_(r)H^(ө)=-74" kJ "mol^(-1) Select the correct statement about the given reaction.
Answer» In (i) reaction, `NO(g)` is UNSTABLE because the ENERGY is released. The energy is released in (ii) reaction, `NO_(2)(g)` is stable. Unstable NO(g) changes into the stable `NO_(2)(g)` The energy is absorbed in (i) reaction, NO(g) is unstable. As energy is released in the (ii) reaction `NO_(2)(g)` is stable. That's why unstable NO(g) changes into the stable `NO_(2)(g)` Both (a) and (B) NONE of these Solution :In reactionn (i) enerrgy is absorbed hence, NO becomes unstable so in reaction (ii) it transform to `NO_(2)` by releasing energy.