Question

Substance	Property
1 . Potassium bromide 2 . Gold	a . Combustible b . Soluble in water
3 . Sulphur 4 . Neon	c . No chemicalreaction d . High ductility

Answer 1

$\bullet$ Gold has higher ductility i.e., easy to make sheets.
$\bullet$ $KBr$ is soluble in water, because it is ionic.
$\bullet$ Neon is an inert gas. So no chemical reaction.
$\bullet$ Sulphur is combustible to produce $S{O}_2$.