Question

Which of the following is not a correct chemical equation for a double displacement reaction?

Answer 1

Answer: $CaCl+LiCO_3\rightarrow CaCO_3+LiCl$

Explanation: A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

In the given reaction:

The molecular formula of Lithium carbonate is incorrect as lithium forms a monovalent cation but carbonate is a divalent polyatomic ion. Thus in order to form a neutral ionic compound two atoms of $Li^+$ must combine with one $CO_3^{2-}$ to give $Li(CO_3)_2$

Answer 2

i just took the test the answer is B