What is the number of moles of electrons gained by one mole oxidizing agent in following redox reaction?

$$\mathrm{Zn_{(s)}+2HCl_{(aq)}}$$ $$\longrightarrow$$ $$\mathrm{ZnCl_2+H_2}$$

Find the temperature in degree Celsius if volume and pressure of 2 mole ideal gas is $$20 \mathrm{~dm}^3$$ and $$4.926 \mathrm{~atmospheres}$$ respectively. ($$\mathrm{R}=0.0821 \mathrm{~dm}^3 \mathrm{~atm} \mathrm{~K}^{-1} \mathrm{~mol}^{-1})$$

What is the geometry of $$\mathrm{PCl}_5$$ molecule as per VSEPR?

What is coordination number of central metal ion in $$\left[\mathrm{Fe}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$$ ?