Question

Solid sodium bromide decomposes into bromine gas and solid sodium . write a balanced chemical equation for this reaction.

Answer 1

$NaBr(s) -----\ \textgreater \ Na(s) + Br_2(g)$

We can balance like the following:

$2NaBr(s) -----\ \textgreater \ 2Na(s) + Br_2(g)$

In NaBr both the oxidation states are +1 and -1 respectively.After the reaction Na reduced to Na+ and Br- oxidised to Br2.So NaBr is a redox reaction,not a decomposition reaction.