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1 2 s. Kmno4 h2s. Kmno4 h2s h2so4. Kmno4 k2so4 h2so4. Kmno4 + h2.
Kmno4 h2s. Kmno4 h2s h2so4. Kmno4 k2so4 h2so4. Kmno4 + h2.

See also