Which of the following is $NOT$ present in baking powder?

Identify the incorrect reaction from the following.

Nelson cell is used for the preparation of

Which one of the following options is correct pertaining to the below transformations?
$Na + NH_{3(l)} \longrightarrow$ Coloured solution $\xrightarrow{\text{on standing}} X + Y$

When $Zn$ is treated with excess of $NaOH$,the product obtained is

Thermal decomposition of sodium nitrate at temperatures above $800\,^oC$ yields ..........