Br 2 + H2 ----- As + O2 ------ Na + CI2 ------ Co+ O2 ------ N2 + H2 ----- Cr + O2 ------

Question

Br 2 + H2 -----
As + O2 ------
Na + CI2 ------
Co+ O2 ------
N2 + H2 -----
Cr + O2 ------

Answer 1

H2+Br2=2HBr
4As+3O2=2As2O3
2Na+Cl2=2NaCl
2CO+O2=2CO2
N2+3H2=2NH3
2Cr+3O2=2Cr2O3