# Why isn't chlorine reduced or nitrogen oxidised in the reaction between ammonium perchlorate and aluminium?

A space shuttle’s upward thrust came from the following reaction between aluminium and ammonium perchlorate.

$$\ce{10 Al + 6 NH4ClO4 → 4 Al2O3 + 2 AlCl3 + 12 H2O + 3 N2}$$

1. Aluminium is oxidised.
2. Chlorine is reduced.
3. Nitrogen is oxidised.

I understand why aluminium is oxidized, but why are 2 and 3 wrong?

• They aren't. Isn't there an "all of the above" answer? – Ian Bush Aug 14 '20 at 8:13
• No there isn't. – Jana Aug 14 '20 at 8:17
• Well the question as written does not require just one of them to be correct – Ian Bush Aug 14 '20 at 8:25
• Notice there is "which statements ...are", not "which statement .. is". The question implies more than one possibility. – Poutnik Aug 14 '20 at 8:29
• @andselisk this is straight from Cambridge so I don't think so – Jana Aug 14 '20 at 8:32