Question

at least one of the products of a double - replacement reaction is a

a gas
b molecular compound
c precipitate
d any of the above
check it

Explanation:

In a double - replacement reaction, the general form is \(AB + CD
ightarrow AD+CB\). For the reaction to occur, at least one of the products must be a gas (e.g., in reactions like \(Na_2S+2HCl = 2NaCl + H_2S\uparrow\)), a precipitate (e.g., \(AgNO_3+NaCl=AgCl\downarrow + NaNO_3\)), or a molecular compound (usually water, e.g., \(HCl + NaOH=NaCl + H_2O\)).

Answer:

D. any of the above