Which of the following reactions are redox reactions? check all that apply. view available hint(s) check all that apply.
a.4li(s)+o2(g)→2li2o(s)
b. mg(s)+fe2+(aq)→mg2+(aq)+fe(s)
c. pb(no3)2(aq)+na2so4(aq)→ pbso4(s)+2nano3(aq)
d. hbr(aq)+koh(aq)→ h2o(l)+kbr(aq)

a and b are redox reactions

Explanation:

Redox reactions involves a transfer of electrons between two species (including reducing agent and oxidizing agent)

Whereas c and d are displacement reaction and neutralisation reaction respectively.

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