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Q.

The pair of compounds that can exist together is 

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a

FeCl3,KI

b

HgCl2,SnCl2

c

FeCl3,SnCl2

d

FeCl2,SnCl2

answer is C.

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Detailed Solution

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· Pair of oxidising agent and reducing agent does not exist together.
· Pair of acid and base does not exist together.
There is no reaction between FeCl2 and SnCl2 because both act as mild reducing agents, have lower oxidation state.
(1) FeCl3 acts as oxidising agent, SnCl2 acts as reducing agent.
(2) HgCl2, acts as oxidising agent SnCl2 acts as reducing agent.
(4) FeCl3 acts as oxidising agent, KI acts as reducing agent.

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