Which of the following have $3C-2e^-$ bond
$I.$ $Al_2Cl_6$ $II.$ $B_2H_6$
$III.$ $Fe_2Cl_6$ $IV.$ $Si_2H_6$
Which is correct statement about Borax
Given below are two statements:
Statement $I$: Group $13$ trivalent halides get easily hydrolyzed by water due to their covalent nature.
Statement $II$: $\mathrm{AlCl}_3$ upon hydrolysis in acidified aqueous solution forms octahedral $\left[\mathrm{Al}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ ion.
In the light of the above statements, choose the correct answer from the options given below :
The dissolution of $Al(OH)_3$ by a solution of $NaOH$ results in the formation of
The element which exists in liquid state for a wide range of temperature and can be used for measuring high temperature is :-