How can you tell that a reaction happened in the double-displacement reaction? A). The color changed B). A Single product formed from two reactants C). A Precipitate formed D). A gas formed Solution The correct answer is Option A,B and D The double displacement reaction is formed when two compounds are mixed to form gas or color change due to formation of precipitate Example: Na2SO4 + Ba(NO3)2 ---------- BaSO4 + 2NaNO3 (BaSO4 precipitate formed) HCl + Na2S -------- 2NaCl + H2S (gas H2S is evolved) If acid-base, then NaOH + H2SO4 ---- Na2SO4 + 2H2O .

1. How can you tell that a reaction happened in the double-displacement reaction?
A). The color changed
B). A Single product formed from two reactants
C). A Precipitate formed
D). A gas formed
Solution
The correct answer is Option A,B and D
The double displacement reaction is formed when two compounds are mixed to form gas or
color change due to formation of precipitate
Example:
Na2SO4 + Ba(NO3)2 ---------- BaSO4 + 2NaNO3 (BaSO4 precipitate formed)
HCl + Na2S -------- 2NaCl + H2S (gas H2S is evolved)
If acid-base, then
NaOH + H2SO4 ---- Na2SO4 + 2H2O