Circle only those of the following reactions that are redox reactions:
k2cro4 + bacl2 ? bacro4 + 2 kcl
cu+s ? cus
agno3 + hcl ? hno3 + agcl
2 na + 2 h2o ? 2 naoh + h2
mgbr2 + 2 naf ? mgf2 + 2 nabr
2 co + o2 ? 2 co2
so2 + h2o ? h2so3

options B,D and F

Explanation:

Since redox reactions are those which involves both oxidation and reduction

In B , Cu is oxidized and S gets reduced

D, Na gets oxidized and hydrogen gets reduced

F, carbon gets oxidized and Oxygen gets reduced

In g, there is no change in oxidation no of s in both product and Reactants is same +4

Similarly in the case of Ag and Mg.

c. is the answer

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