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The processes of charge-exchanges of $\pi^{-}$ and $K^{-}$ on protons at highenergies and zero transfers are described on the basis of the parton model. Itis shown that at the mentioned kinematic conditions the scattering occurs onthe valence quarks only, while scattering on sea quarks leads to disruption offinal state. Thereby a substantiation is given of the valence approximation forthe specified reaction. On the basis of GAMS-4$\pi$ data it is shown that thedescription of $\eta - \eta'$ mixing does not require an introduction ofadditional states that do not fit into the scheme of basis states $|\eta_N >$and $|\eta_S >$. The resulting value of the mixing angle is $\phi_p=(36.1\pm0.9)^0$.

$K^{-}p$ and $\pi^{-}p$ charge-exchange processes and $\eta - \eta'$ mixing