Kernite and cryolite are the minerals of two elements $X$ and $Z$. Respectively $X$ and $Z$ are

Which of the following substances imparts a green color to the burner flame?

In the following unbalanced reaction,the product formed is $Al_2O_3 + NaOH_{(aq)} + H_2O \longrightarrow$

$A$ 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 crystals of an acid $Z$ separate out.
Write equations for all the above reactions and identify $X, Y,$ and $Z$.

Which of the following is an incorrect statement about the compounds of group $13$ elements?

The correct formula of borax is $Na_2[B_4O_5(OH)_4] \cdot 8H_2O$. If the formula is represented as $Na_2[B_4O_5(OH)_x] \cdot yH_2O$, then the sum of $x$ and $y$ is: