K2cr2o7 k2so4 h2o. K2cr2o7 na2s. k2cr2o7 h2s. cr cr2o3 cr cr2s3. k2cr2o7 h2so4.

K2cr2o7 k2so4 h2o. K2cr2o7 na2s. k2cr2o7 h2s. cr cr2o3 cr cr2s3. k2cr2o7 h2so4.
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