An alloy is

When a metal $X$ is treated with cold water,it gives a basic salt $Y$ with molecular formula $XOH$ (Molecular mass $= 40$) and liberates a gas $Z$ which easily catches fire. Identify $X, Y, Z$.

What is the molecular formula of calcium silicate (slag)?

When sulfur dioxide gas is passed through lime water,which insoluble substance is formed that turns the solution milky?

Which alloy is used for making statues and medals?

State three reasons for the following fact:
$(a)$ Sulphur is a non-metal.
One of the reasons must be supported with a chemical equation.