What do you understand by non-stoichio metric compounds?

What do you understand by Bt.

What do you understand by COD?

What do you understand by gas?

What do you understand by ppm ?

What do you understand by stoichiometric coefficients ?

What do you understand by : Bentonite

What do you understand by biocontrol?

What do you understand by Metalloids

What do you understand by isomerism?

What do you understand by the term 'non-stoichiometric hydrides' ? Do you expect this type of hydrides to be formed by alkali metals'? Justify your answer.