If an aqueous solution of ______ is added so a mixture of F^- and SO_4^2-, the f

Question

If an aqueous solution of ______ is added so a mixture of F^- and SO_4^2-, the fluoride ion will precipitate, but the sulfate ion will remain in solution. a. LiBr b. HNO_3 c. Pb(CO_4)_2 d. MgNO_3 e. AlCl_3 write a balanced chemical equation for the reaction of aqueous solutions of sodium sulfide and zinc(II) chloride. A. Na_2S(aq) + ZnCl_2(aq) ZnS(s) + 2 NaCl(aq) b. Na_2S(aq) + ZnCl_2(aq) ZnS(s) + 2 NaCl(s) c. Na_2S(aq) + ZnCl_2(aq) Na_2Zn(s) + SCl_2(aq) d. Na_2S(aq) + ZnCl_2(aq) Na_2Zn(s) + SCl_2 (g) e. No reaction occurs. What is the net ionic equation for the reaction of aqueous sodium hydroxide and aqueous iron(II) chloride? a. Na^+(aq) + OH^+(aq) rightarrow NaOH(s) b. Na^+(aq) + Cl^-(aq) rightarrow NaCl(s) c. Fe^2+(aq) + 2 OH^-(aq) rightarrow Fe(OH)_2(s) d. Fe^2+(aq) + OH^-(aq) rightarrow Fe(OH)^+(s) e. Fe^2+(aq) + 2 Cl^-(aq) rightarrow FeCl_2(s) What is the net ionic equation for the reaction of aqueous hydrochloric acid and aqueous potassium hydroxide? a. HCl(aq) + OH^+(aq) rightarrow H_2O(l) + Cl^+(aq) b. Cl^-(aq) + K^+(aq) rightarrow KCl(s) c. HCl(aq) + KOH(aq) rightarrow KCl(aq) + H_2O(l) d. Cl^-(aq) + K^-(aq) rightarrow KCl(aq) e. H^+(aq) + OH^-(aq) rightarrow H_2O(l) Which species is reduced in the reaction below? I^-(aq) + ClO^-(aq) rightarrow IO^-(aq) + Cl^-(aq) a. I^- b. H_2O c. Cl^- d. IO^- e. ClO^- What is the oxidation number of sulfur in sulfur in H_2S? a. -2 b. 0 c. +2 d. +4 e. +6

Explanation / Answer

SOLUTION:

Q5. Option (d) is correct answer. When Mg(NO3)2 is added to the solution, Mg will react with F- to form MgF2which has very low solubility in water hence will precipitate out.

Q6. OPTION (a) is correct answer. ZnS will precipitate out.

Q7, 2NaOH(aq) + FeCl2 (aq) ----------> Fe(OH)2 (s) + 2NaCl(aq)

The above reaction can be shown as:

2Na+(aq) + 2OH-(aq) + Fe2+(aq) + 2Cl- (aq) --------> Fe(OH)2 (s) + 2Na+(aq) + 2Cl-(aq)

Net ionic reaction is ( Cancell out same ions on opposite side)

Fe2+(aq) +2OH-(aq) --------> Fe(OH)2 (s)

Hence option (c) is correct answer.

Q8. OPTION (e) is correct answer. (HINT: Same procedure as above)

Q9. ClO- is reduced as the oxidation number of chlorine is decreased from+1 to -1.

Q10. Oxidation number of S in H2S is -2.

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