65. Solving a chemistry problem
648. Which of the following substances react with each other: Cr(OH)3 and KOH; Cr2O3 and SiO2; Cr(NO3)3 and MgCl2; K2CrO4 and H2SO4; Na2Cr2O7 and NaOH; Cr2O3 and H2O. Write equations for the corresponding reactions.
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