6. State whether the reactions are spontaneous or nonspontaneous using the standard reduction potentials? (5 marks) a. CuSO4 (aq) +2Ag (s) Ag2SO4(aq)+Cu (s) b. Cl2(g)+2Br1(aq)2Cl1(aq)+Br2(l) c. Fe(s)+Cr(NO3)2 (aq) Cr (s) +Fe(NO3)2 (aq) d. Mg (s) +2AgNO3 (aq) Mg(NO3)2 (aq) +2Ag(s) e. 3Cu(NO3)2 (aq) +2Al (s) 2Al(NO3)3(aq)+3Cu (s)