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Complete the following chemical equation...

Complete the following chemical equations:
(i) `Na_2CrO_4+H_2SO_4to`
(ii) `MnO_2+KOH+O_2to`
(iii) `HgCl_2+SnCl_2 to`

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(i) `2Na_2CrO_4+H_2SO_4("Conc.")toNa_2CrO_2O_7+Na_2SO_4+H_2O`
(ii) `2MnO_2+4KOH+O_2to2K_2MnO_4+2H_2O`
(iii) `HgCl_2+SnCl_2toHg_2Cl_2downarrow+SnCl_4`
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