Which of the following is a non-metal?

The correct statement is:

Which of the following compounds are formed when boron trichloride is treated with water?

When an excess of $NaOH$ solution is added to a solution of potassium alum,what do we obtain?

In the structure of $B_2H_6$,the number of $BH_2$ groups present in one plane,and the number of $B-H$ terminal bonds,$B-B$ bonds,and $B-H-B$ bridge bonds are respectively:

The number of terminal and bridging hydrogens in $B_2H_6$ are respectively