$PCl_3$ reacts with water to form:

With excess of water,$PCl_5$ gives

How is red phosphorus obtained from white phosphorus?

Which of the following is a metalloid?

An orange solid $(X)$ on heating gives a colourless gas $(Y)$ and only a green residue $(Z)$. Gas $(Y)$ on treatment with $Mg$ produces a white solid substance. Identify the white solid substance.

What is the basicity of $H_3PO_4$?