67. How many have two different oxidation number same element 1) Cr O5 5) Na2 S4 O6 2) K3 Cr O8 6) Br3 O8 3) H3 PO5 7) H2 [Cu H4] 4) H2 N2 O2 8) NH4 NO2

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K_{3} {C r O}_{8}

+ 6

+ 5

+ 3

+ 2

H_{2}, H_{2}^{+}, L i_{2}, B e_{2}, B_{2}, C_{2}, O_{2}^{-},

N_{2}

F_{2}

H = 1, H e = 2, L i = 3, B e = 4, B = 5, C = 6, N = 7, O = 8, F = 9)

H_{3} {P O}_{4}, H_{2} {S O}_{4}, H_{3} {P O}_{3}, H_{2} {C O}_{3}, H_{2} S_{2} O_{7}, H_{3} B O_{3}, H_{3} {P O}_{2}, H_{2} {C r O}_{4}, H_{2} {S O}_{3}

h_{1}, h_{2}, h_{3}, k_{1}, k_{2}, k_{3},

(2, k_{1}),

(3, k_{2}),

(7, k_{3}),

(h_{1}, 4),

(h_{2}, 5),

(h_{3}, - 3)

(2, 1)

C r_{2} O_{7}^{2 -}

C l O_{3}^{-}

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