An ideal gas in thermally insulated vessel at internal pressure = p₁, volume = V₁ and absolute temperature = T₁ expands irreversibly against zero external pressure, as shown in the diagram.

The final internal pressure, volume and absolute temperature of the gas are p₂, V₂ and T₂, respectively. For this expansion

The correct statement(s) for orthoboric acid is/are

The total number of distinct naturally occurring amino acids obtained by complete acidic hydrolysis of the peptide shown below is

Consider the following list of reagents, acidified K₂Cr₂O₇, alkaline KMnO₄, CuSO₄, H₂O₂, Cl₂, O₃, FeCl₃, HNO₃ and Na₂S₂O₃. The total number of reagents that can oxidise aqueous iodide to iodine is