From the given list, the number of compounds with +4 oxidation state of Sulphur ________.

$$\mathrm{SO}_3, \mathrm{H}_2 \mathrm{SO}_3, \mathrm{SOCl}_2, \mathrm{SF}_4, \mathrm{BaSO}_4, \mathrm{H}_2 \mathrm{S}_2 \mathrm{O}_7 $$

If the formula of Borax is $$\mathrm{Na_2B_4O_x(OH)_y~.~zH_2O}$$, then $$x+y+z=$$ ___________

The difference in the oxidation state of $$\mathrm{Xe}$$ between the oxidised product of $$\mathrm{Xe}$$ formed on complete hydrolysis of $$\mathrm{XeF}_{4}$$ is ___________

In the following reactions, the total number of oxygen atoms in X and Y is ___________.

Na$$_2$$O + H$$_2$$O $$\to$$ 2X

Cl$$_2$$O$$_7$$ + H$$_2$$O $$\to$$ 2Y