When bismuth chloride is poured into a large volume of water,the white precipitate produced is

Which oxoacid of phosphorus has the highest number of oxygen atoms present in its chemical formula?

Superphosphate is the mixture of

Give an example to show the effect of concentration of nitric acid on the formation of oxidation products.

Assertion : Although $PF_5, PCl_5$ and $PBr_5$ are known,the pentahalides of nitrogen have not been observed.
Reason : Phosphorus has lower electronegativity than nitrogen.

$A$ group $15$ element forms $d \pi - d \pi$ bond with transition metals. It also forms a hydride,which is the strongest base among the hydrides of other group members that form $d \pi - d \pi$ bonds. The atomic number of the element is $.......$