Assertion : Coloured cations can be identified by borax bead test.

Reason : Transparent bead $(NaBO_2 + B_2O_3)$ forms coloured bead with coloured cation.

Borax in its crystal possess

A certain salt $X,$ gives the following results.

$(i)$ Its aqueous solution is alkaline to litmus.

$(ii) $ It swells up to a glassy material $Y$ on strong heating.

$(iii)$ When conc. $H _{2} SO _{4}$ is added to a hot solution of $X,$ white crystal of an acid $Z$ separates out.

Write equations for all the above reactions and identify $X, Y$ and $Z$

Which of the following cation can not give borax bead test ?

When metal $X$ is treated with sodium hydroxide, a white precipitate $(A)$ is obtained, which is soluble in excess of $NaOH$ to give soluble complex $(B)$. Compound $(A)$ is soluble in dilute $HCl$ to form compound $(C)$. The compound $(A)$ when heated strongly gives $(D)$, which is used to extract metal. Identify $(X), (A), (B), (C)$ and $(D)$. Write  suitable equations to support their identities.