[Heyitsme]

Question:- Zn + NaNO₃ + NaOH  Gas(X).
                   The gas(x) can be produced by heating
Options:- (1) NH₄NO₃
                 (2) NH₄IO₃
                 (3) NH₄NO₂
                 (4) (NH₄)₂CO₃

Now my question is how do you know which gas will evolve? Is there a way or you need to remember the equation of the salts on heating? If there is a way, is there any particular chapter i can read?
Thank you.

[chenbeier]

All 4 answers are not gases. They are salts. If you heat the salts only one will develop the the same gas like in the first reduction equation.

[Heyitsme]

Sorry if my question wasn't clear enough but yes, i know one of the salts will produce the same gas(x) as the question on heating. What i want to know is how to find out which gas will evolve on heating those salts.
For example:- in option (2) NH₄IO₃ can evolve NH₃, I₂, H₂, O₂, N₂ but how to know which of these will evolve?

[chenbeier]

Expierence and Learning. In this case N₂, O₂, I₂ and H₂O will developed.

https://en.wikipedia.org/wiki/Ammonium_iodate