Assign oxidation numbers to the atoms in the following species: a) HClO_3 H ____

Question

Assign oxidation numbers to the atoms in the following species: a) HClO_3 H ______ Cl _______ O ______ b) Al_2O_3 Al _______ O _______ c) MnO_4^- Mn _____ O _______ d) Sn(OH)_6^-2 Sn _______ O ________ H _______ Use the half-reaction method to balance the following equations:: a) Sn^+2 + Fe^+3 rightarrow Sn^+4 + Fe^+2 b) Fe^+2 + Cr_2O_7^2- rightarrow Fe^+3 + Cr^3+ in acidic solution c) MnO_4^- + C_2O_4^2- rightarrow Mn^2+ + CO_2 in acidic solution d) MnO_4^- + I^- rightarrow MnO_2 + I_2 in basic solution

Explanation / Answer

electrochemistry:

HClO : Say Oxidation number of Cl is x. oxidation number of H = -1, and O = -2

-1 + x + (-2) = 0 [ the sum of O.N. is 0 for neutral molecule]

x = + 3

The O. N. of Cl is +3.

b) MnO4-: say O. N. of Mn = x

x + 4 (-2) = -1

x = + 7.

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