On adding water to $BiCl_3$ solution in $HCl$,the compound produced is

The gas produced from thermal decomposition of $(NH_4)_2Cr_2O_7$ is

When heated $NH_3$ is passed over $CuO$,the gas evolved is:

Which of the following statements about white phosphorus is false?

On reaction with $Cl_2$,phosphorus forms two types of halides $A$ and $B$. Halide $A$ is a yellowish-white powder,while halide $B$ is a colourless oily liquid. Identify $A$ and $B$ and write the formulas of their hydrolysis products.

Which nitrogen trihalide is the least basic?