$\mathrm{C}+$ Conc. $\mathrm{H}_{2} \mathrm{SO}_{4} \xrightarrow{\Delta} X+Y+\mathrm{H}_{2} \mathrm{O}$
$X$ and $Y$ in the above reaction are
Which among the following oxoacids of phosphorous will have $\mathrm{P}-\mathrm{O}-\mathrm{P}$ bonds?
I. $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{5}$
II. $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{6}$
III. $\mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7}$
IV. $\left(\mathrm{HPO}_{3}\right)_{3}$
Observe the following $f$-block elements
$\mathrm{Eu}(Z=63) ; \mathrm{Pu}(Z=94) ; \mathrm{Cf}(Z=98)$;
$\operatorname{Sm}(Z=62) ; \mathrm{Gd}(Z=64) ; \mathrm{Cm}(Z=96)$
How many of the above have half-filled $f$-orbitals in their ground state?
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