Caesium is used in

Fluorosis disease is caused due to the reaction of ...... with excess of fluoride in the body.

Which of the following substances is used in gunpowder?

Which compound has the lowest thermal stability?

The metal which does not form ammonium nitrate by reaction with dilute nitric acid is

The white precipitate $(Y)$, obtained on passing a colourless and odourless gas $(X)$ through an ammoniacal solution of $NaCl$, loses about $37 \%$ of its weight on heating and a white residue $(Z)$ of basic nature is left. Identify $(X)$, $(Y)$, and $(Z)$ from the following sets.