The nitrate of which of the following metals does not liberate $NO_2$ gas on heating?

Which of the following statements is correct regarding alkali metals?

Which one of the following is manufactured by the electrolysis of fused sodium chloride?

$A$ metal $(A)$ on heating in nitrogen gas gives compound $(B)$. $(B)$ on treatment with $H_{2}O$ gives a colourless gas which when passed through $CuSO_{4}$ solution gives a dark blue-violet coloured solution. $(A)$ and $(B)$ respectively,are

Hydrogen is not obtained when zinc reacts with

In $LiAlH_4$,metal $Al$ is present in