Question

Ba(NO3)2 + K2SO4,Mg(NO3)2 + Na2Co3,MgCl2+ KNO3,​

Answer 1

Ba(NO3)2 + K2SO4 = Ba(SO4) +2 K(NO3)2

Mg(NO3)2 + Na2Co3 = Mg(CO3) +2 Na(NO3)

MgCl2+ KNO3 = Mg(NO3)2+ 2 KCl

Answer 2

It seems like you've listed a few chemical equations involving different reactants. Are you looking for information about these reactions? If so, I'd be happy to provide you with details about the reactions and the products they produce. Just let me know what specific information you're seeking!