In whichof the following reactions, no change in gaseous volume occurs when measured at similar T and P?

In whichof the following reactions, no change in gaseous volume occurs

1.	In whichof the following reactions, no change in gaseous volume occurs when measured at similar T and P?
Answer» COMBINATION of `N_(2)andO_(2)` to give NO Combination of `N_(2)andH_(2)` to form `NH_(3)` Combustion of CARBON to give `CO_(2)` Combustion of carbon monoxide Solution :`underset("1vol")(N_(2))+underset("1vol")(O_(2))rarrunderset("2vol")(2NO)` `C_((s))+underset("1 vol")(O_(2(g)))rarrunderset("1 vol")(CO_(2(g))`