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.

• A

  A & B
• B

  B & C
• Correct answer
  C

  C & D
• D

  A & D

Hence, the correct answer is option: 'C'.