Which of the following metal carbides is known as a methanide?

$A$ metal $M$ on heating in nitrogen gas gives $Y$. $Y$ on treatment with $H_2O$ gives a colourless gas which when passed through $CuSO_4$ solution gives a blue colour. $Y$ is

The alkali metals form salt-like hydrides by direct synthesis at elevated temperatures. The thermal stability of these hydrides decreases in which of the following orders?

Select the incorrect statement.

The stability order of oxide,peroxide,and superoxide of alkali metals is:

The metal which does not form ammonium nitrate by reaction with dilute nitric acid is