Question #13431

1 Answer
Jul 15, 2017

Answer:

A. #H_2+Br_2 to 2HBr#

Explanation:

A. #H_2+Br_2 to 2HBr#
This is a synthesis reaction, two reactants form a single product.

B. #Mg+H_2SO_4 to MgSO_4 + H_2#
This is clearly an reduction-oxidation reaction; #Mg# is oxidized and the #H^+# ions are reduced. This is since the former is more reactive than the latter in the activity series.

C. #NaCl to Na^+ + Cl^-#
This is merely a dissolution reaction, perhaps in an aqueous solution, such as water.

D. #2H_2O+2Na(s) to 2NaOH + H_2#
Another reduction-oxidation reaction, for the same reason as above!