Will medal ^_^ Which of the following is not a correct chemical equation for a double displacement reaction?

a. 2HNO3 + Mg(OH)2 yields 2H2O + Mg(NO3)2
b. H3PO4 + 3NaF yields 3HF + Na3PO4
c. KNO2 + BaSO4 yields K2SO4 + Ba(NO2)2
d. 4LiBr + Co(SO3)2 yields Br2SO3 + CoLi4

Question

Will medal ^_^    Which of the following is not a correct chemical equation for a double displacement reaction?

a.    2HNO3 + Mg(OH)2 yields 2H2O + Mg(NO3)2
b.    H3PO4 + 3NaF yields 3HF + Na3PO4
c.    KNO2 + BaSO4 yields K2SO4 + Ba(NO2)2
d.    4LiBr + Co(SO3)2 yields Br2SO3 + CoLi4

anonymous · Answer

@Justanotherguy  u think u can help me please?

anonymous · Answer

3, there should be a 2 in front of potassium nitrite.