Among the following the least stable resonance structure is :

A positron is emitted from $$_{11}^{23}$$Na The ratio of the atomic mass and atomic number of the resulting nuclide is :

For the process $$\mathrm{H_2O}(l)$$ (1 bar, 373 K) $$\to$$ $$\mathrm{H_2O}(g)$$ (1 bar, 373 K), the correct set of thermodynamic parameters is:

Statement-1 : Alkali metals dissolves in liquid ammonia to give blue solutions

Statement-2 : Alkali metals in liquid ammonia give solvated species of the type $$\left[\mathrm{M}\left(\mathrm{NH}_{3}\right)_{n}\right]^{+} (\mathrm{M}=$$ alkali metals).