Name the gas that has a smell like rotten fish.

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

$A$ non-metal $M$ forms $MCl_3$,$M_2O_5$ and $Mg_3M_2$ but does not form $MI_5$. Then the incorrect statement regarding non-metal $M$ is:

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

Which of the following is a non-combustible hydride?

Write a note on oxidation states of group $-15$ elements. Write a note on the nature of bonding of group $-15$ elements.