which of the following statement is not correct? (A) All alkali-metals salts impart a characteristic colour to the Bunsen flame.
(B) The correct order of increasing thermal stability of the carbonates of alkali metals is `Li_(2)CO_(3)`<`Na_(2)CO_(3)`<`K_(2)CO_(3)`<`Rb_(2)CO_(3)`<`Cs_(2)CO_(3)`
(C) Among the alkali metal's cesium is the most reactive.
(D) The reducing character of the alkali metal hydrides follow the order: "LiH>NaH>KH>RbH>CsH" ."]