This is a double replacement reaction where the metals exchange with each other. Ba Has a plus 2 charge and therefore one needs 2 I to counterbalance the charge of the Ba. The S has a minus 2 charge and one will need 2 K+1 to even out the charge for that compound.
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Verified answer
There is no reaction.
(If there was a reaction, bee killer would be correct.)
2KI + BaS ----> K2S + BaI2
This is a double replacement reaction where the metals exchange with each other. Ba Has a plus 2 charge and therefore one needs 2 I to counterbalance the charge of the Ba. The S has a minus 2 charge and one will need 2 K+1 to even out the charge for that compound.