6.1 Complete the reaction equation by placing the coefficient. by the method of electron-ionic or electronic balance:
A) acidic environment
1) KI NaClO H2SO4 → I2 NaCl K2SO4 H2O
2) Na2S Na2Cr2O7 H2SO4 → S Cr2(SO4)3 Na2SO4 H2O
B) Alkaline environment
1) CrCl3 Br2 KOH  K2CrO4 KBr KCl H2O
B) Neutral environment
1) AgNO3 AsH3 H2O → Ag H3AsO4 HNO3

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