1) Which statement is correct? a) Oxidation involves loss of electrons and a decrease in oxidation state. b) Oxidation involves gain of electrons and an increase in oxidation state. c) Reduction involves loss of electrons and an increase in oxidation state. d) Reduction involves gain of electrons and a decrease in oxidation state. 2) The oxidation number of chromium is the same in all the following compounds except a) Cr(OH)3 b) Cr2O3 c) Cr2(SO4)3 d) CrO3 3) What happens to the Cr3+ (aq) ion when it is converted to CrO42-(aq)? a) Its oxidation number decreases and it undergoes reduction. b) Its oxidation number decreases and it undergoes oxidation. c) Its oxidation number increases and it undergoes reduction. d) Its oxidation number increases and it undergoes oxidation. 4) The following reactions are spontaneous as written. Fe(s) + Cd2+(aq) → Fe2+(aq) + Cd(s). Cd(s) + Sn2+(aq) → Cd2+(aq) + Sn(s). Sn(s) + Pb2+(aq) → Sn2+(aq) + Pb(s) Which of the following pairs will react spontaneously? I. Sn(s) + Fe2+(aq) II. Cd(s) + Pb 2+(aq). III. Fe(s) + Pb2+(aq)   a) I only b) II only c) III only d) II and III only 5) Which equations represent reactions that occur at room temperature? I. 2Br-(aq)+ Cl2(aq) → 2Cl-(aq) + Br2(aq). II. 2Br-(aq) + I2(aq) → 2I-(aq)+ Br2(aq). III. 2I-(aq)+ Cl2(aq) → 2Cl-(aq)+ I2(aq) a) I and II only b) I and III only c) II and III only d) I, II and III 6) Which equation represents a redox reaction? a) KOH(aq) + HCl(aq) → KCl(aq) + H2O(l) b) Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) c) CuO(s) + 2HCl(aq) → CuCl2(aq) + H2O(l) d) ZnCO3(s)+ 2HCl(aq) → ZnCl2(aq) + CO2(g) + H2O(l) 7) The following information is given about reactions involving the metals X, Y and Z and the solutions of their sulfates. X(s) + YSO4(aq) → no reaction Z(s) + YSO4-(aq) → Y(s)+ ZSO4 -(aq) When the metals are listed in decreasing order of reactivity (most reactive first), what is the correct order?  a) Z > Y > X b) X > Y > Z c) Y > X > Z d) Y > Z > X

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