1. BALANCE K2Cr2o7+H2So4 gives K2So4+Cr2(So4)3+H2o+o2

The balanced equation is:

2K2Cr2O7 + 8H2SO4  2K2SO4 + 2Cr2(SO4)3 + 8H2O + 3O2

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3K2Cr2O7 + 3H2SO4 -------==========-------- 3K2SO4 + Cr2(SO4)3 + 3H2O + 3O2

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