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Q.
The pair of compounds that can exist together is
NTA AbhyasNTA Abhyas 2022
Solution:
As $\text{FeC}\text{l}_{2},\text{SnC}\text{l}_{2}$ both are reducing agents, so reaction is not possible between them. Hence, they can exist together.
In rest of other pairs redox reaction occurs so they cannot exist together.