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Answer: 1a. Ca1(MnO4)2 1b. Lead (IV) sufite
2a. net ionic reaction = 2 Al + 3 Zn+2 --> 2 Al+3 + 3 Zn
2b. net ionic reaction = 1 Ca+2 + 1 SO3-2 --> 1 Ca(SO3)1 (s)
3. 54.5%
4. Zn is oxidized, N in HNO3 is reduced
HNO3 is oxidizing agent , Zn is reducing agent