K2Cr2O7 + H2SO4 + H2S → ___ + ___ + ___ + ___

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TextPotassium Dichromate: Preparation and Properties

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Account for the following: (1) The melting and boiling points of Zn, Cd and Hg are low. (2) Of the d⁴ species, Cr²⁺ is strongly reducing while Mn³⁺ is strongly oxidizing. (3) E° value of Cu²⁺/Cu is + 0·34 V.

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