Which of the following is an example of a double replacement reaction?(2 points)

Question

Responses

C + O2
→CO2
C + O 2 →CO 2

Na2
S + CaCl2
→CaS + 2NaCl
Na 2 S + CaCl 2 →CaS + 2NaCl

Mg + HCl→MgCl2
+ H2
Mg + HCl→MgCl 2 + H 2

2H2
+ O2
→2H2
O

Answer 1

The example of a double replacement reaction from the options provided is:

Na2S + CaCl2 → CaS + 2NaCl

In a double replacement reaction, two compounds exchange ions or elements to form two new compounds. In this case, sodium (Na) and calcium (Ca) are exchanging places with sulfur (S) and chloride (Cl).