Cu²⁺ salt reacts with potassium iodide to give

In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of :

The correct order of their reactivity towards hydrolysis at room temperature is :

For a given chemical reaction A $$\to$$ B at 300 K the free energy change is $$-$$49.4 kJ mol^$$-$$1 and the enthalpy of reaction is 51.4 kJ mol^$$-$$1. The entropy change of the reaction is _____________ JK^$$-$$1 mol^$$-$$1.