Balance las ecuaciones por el método de oxido reducción recuerde Indicar Oxidante, reductor, agente oxidante, agente reductor

1. HI + H2SO4 → SO2 + I2 + H2O

2. SO2 + O2 + CaCO3 → CaSO4 + CO2

3. PbS + Cu2S + HNO3 → Pb(NO3)2 + Cu(NO3)2 + NO2 + S + H2O

4. H2O2 + KMnO4 + H2SO4 → K2SO4 + MnSO4 + O2 + H2O

whoa this is hard i really dont know

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).