Which of the following reagents can be used to distinguish between sodium sulphite and sodium sulphate? (1) iron(II) chloride solution
(2) acidified potassium permanganate solution
(3) concentrated nitric acid
A. (1) only
B. (2) only
C. (1) and (3) only
D. (2) and (3) only

please please help this confused me for so long

"the periodic table is arranged in order of atomic number."

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.