Question

HELP PLEASE

Which of the following chemical reactions is an oxidation-reduction reaction?
WO3 + 3H2 --> W + 3H2O
B) KNO3 + LiCl --> LiNO3 + KCl
C) CaSO4 + 2NaCl --> Na2SO4 + CaCl2
D) Mg(NO3)2 + 2HBr --> MgBr2 + 2HNO3

Answer 1

An redox reaction involves the transfer of electrons between substances, which results in changes in oxidation numbers of atoms included in the reaction.
In the first reaction, \(\sf {W^{6+}}\) gains 6 electrons to become \(\sf W\). Therefore, the first reaction is a redox reaction