36. Which of these reactions IS a reduction-oxidation reaction? HCl(aq) + H 2 O(

Question

36. Which of these reactions IS a reduction-oxidation reaction?

HCl(aq)           +          H2O(l)             à H3O+(aq)    +          Cl-(aq)

2 Na (s)           +          2 H2O(l)         à 2 NaOH(s) +          H2 (g)

Cu2+(aq)          +          4 NH3(aq)        à Cu(NH3)42+ (aq)

HNO3 (aq)         +          KOH (aq)        à KNO3(aq) +          H2O (aq)

C6H12O6 (s)       +          O2 (g)                   à 6 CO2 (g)    +         6H2O (l)

a. I and II                    b. II and III                 c. III and IV                d. II and V                   e. II and IV

Explanation / Answer

Answer: II and IV

2 Na (s)           +          2 H2O(l)         à 2 NaOH(s) +          H2 (g)

C6H12O6 (s)       +          O2 (g)                   à 6 CO2 (g)    +         6H2O (l)

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