White phosphorus $P_{4}$ has the following characteristics:

An inorganic salt $(A)$ is decomposed at about $523 \ K$ to give products $(B)$ and $(C).$ Compound $(C)$ is a liquid at room temperature and is neutral to litmus paper,while oxide $(B)$ on burning with white phosphorus,gives a dehydrating agent $(D).$ Compounds $(A)$,$(B)$,$(C)$ and $(D)$ will be identified as:

Which of the following is used widely in the manufacture of lead storage battery?

What is the highest oxidation state possessed by phosphorus in its oxyacids?

What is the basicity of orthophosphoric acid?

When aluminium phosphide is treated with dil. sulphuric acid,which gas is evolved?