a163 reactions expressed scheme: a) K2Cr2O7 + HCl ͛

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163. The reactions schemes are expressed: a) K2Cr2O7 + HCl → Cl2 + CrCl3 + KCl + H2O; b) Au + HNO3 + HCl → AuCl3 + NO + H2O. Make electronic-ionic equation. Arrange the coefficients in the reaction equation. For each reaction, specify what substance is an oxidizer, which - reducing agent; What substance is oxidized, which - restored.

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The objectives of the manuals "Chemistry. Guidelines, work program and control tasks, "ed. prof. VA Averyanov, Part 2, Tula, 2004.
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