The correct increasing order of stability of the complexes based on $\Delta_0$ value is :

1. I. $[\text{Mn}(\text{CN})_6]^{3-}$


2. II. $[\text{Co}(\text{CN})_6]^{4-}$


3. III. $[\text{Fe}(\text{CN})_6]^{4-}$


4. IV. $[\text{Fe}(\text{CN})_6]^{3-}$

500 J of energy is transferred as heat to 0.5 mol of Argon gas at 298 K and 1.00 atm. The final temperature and the change in internal energy respectively are: Given: R = 8.3 J K^-1 mol^-1

The molar conductivity of a weak electrolyte when plotted against the square root of its concentration, which of the following is expected to be observed?

The correct option with order of melting points of the pairs (Mn, Fe), (Tc, Ru) and (Re, Os) is :