Which alkali metal emits blue colour light in a flame test?

Which of the following reactions is not correct?

White metal is an alloy of

For alkali metals, which one of the following trends is incorrect?

The order of negative standard electrode potential values $(E^\circ_{M^+/M})$ for $Li$,$Na$,and $K$ is:

Which one of the following options is correct pertaining to the below transformations?
$Na + NH_{3(l)} \longrightarrow$ Coloured solution $\xrightarrow{\text{on standing}} X + Y$