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Question

Give the oxidation state of underlined.
Na2S2O3.

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Solution

Let the oxidation number of S in Na2S2O3 be x. The oxidation states of Na and O are +1 and -2 respectively. Since the atom as whole is neutral, following equation holds true:

2×(+1)+2×(x)+3×(2)=02+2x6=02x=62x=42=+2
Hence, oxidation state of S is +2.

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