Select the correct statements from the following

(A) Aluminium liberates $\mathrm{H}_2$ gas with dil. HCl but not with aqueous NaOH .

(B) Formula of sodium metaborate is $\mathrm{Na}_3 \mathrm{BO}_3$.

(C) Boric acid is a weak monobasic acid.

(D) For thallium, +1 state is more stable than +3 state.

The number of amphoteric oxides from the following is $\mathrm{CO}_2, \mathrm{GeO}_2, \mathrm{SnO}_2, \mathrm{PbO}_2$, $\mathrm{CO}, \mathrm{GeO}, \mathrm{SnO}, \mathrm{PbO}$

Which of the following statements is not correct?

Consider the sets I, II and III. Identify the set(s) which is (are) correctly matched.

I. Staggered ethane > eclipsed ethane ..........torsional strain.

II. 2, 2-dimethylbutane > 2-methylpentane ......... boiling point

III. cis-but-2-ene > trans-but-2-ene ......... dipole moment