Which elements of group $13$ possess both $+1$ and $+3$ oxidation state? 

If $B-Cl$ bond has a dipole moment, explain why $BCl_3$, molecule has zero dipole moment.

The type of hybridisation of boron in diborane is

Consider the following reaction 

$(a)\, B_2H_6 + 6H_2O \to$
$(b)\, B_2H_6 + 6CH_3OH \to$
$(c)\, B_2H_6 + 3Cl_2 \to$
$(d)\, BR_3 + 3CH_3COOH \to$

Identify incorrect statement about product $(s)$

Borax in its crystal possess

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

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