Consider the following reactions:
\( \mathrm{NaCl + K_2Cr_2O_7 + H_2SO_4 \rightarrow A + KHSO_4 + NaHSO_4 + H_2O} \)
\( \mathrm{A + NaOH \rightarrow B + NaCl + H_2O} \)
\( \mathrm{B + H_2SO_4 + H_2O_2 \rightarrow C + Na_2SO_4 + H_2O} \)
In the product ‘C’, ‘X’ is the number of \( \mathrm{O_2^{2-}} \) units, ‘Y’ is the total number oxygen atoms present and ‘Z’ is the oxidation state of Cr. The value of \( X + Y + Z \) is __________.
