Which one of the following statement is true for all the alkali metals?

Options

A. Their nitrates decompose on heating to give ` NO_2 and O_2`
B. Their carbonates decompose on heating to give ` CO_2` and the metal oxide
C. They react with oxygen to give mainly the oxide `M_2O`
D. They react with halogens to give the halides MX

Answer

D

Explanation

Alkali metal react with halogen to give halides. They are normally represented by `M^(+) X^(-)`