Deck 4: Three Major Classes of Chemical Reactions

Question 1

Calcium chloride is used to melt ice and snow on roads and sidewalks and to remove water from organic liquids. Calculate the molarity of a solution prepared by diluting 165 mL of 0.688 M calcium chloride to 925.0 mL.

A) 3.86 M
B) 0.743 M
C) 0.222 M
D) 0.123 M
E) 0.114 M

Answer 1

0.123 M

Question 2

A 0.150 M sodium chloride solution is referred to as a physiological saline solution because it has the same concentration of salts as normal human blood. Calculate the mass of solute needed to prepare 275.0 mL of a physiological saline solution.

A) 41.3 g
B) 31.9 g
C) 16.1 g
D) 8.77 g
E) 2.41 g

Answer 2

2.41 g

Question 3

Sodium hydroxide, also known as caustic soda, is used to neutralize acids and to treat cellulose in making of cellophane. Calculate the number of moles of solute in 1.875 L of 1.356 M NaOH solution.

A) 2.543 mol
B) 1.383 mol
C) 0.7232 mol
D) 0.3932 mol
E) 0.001383 mol

Answer 3

2.543 mol

Question 4

What volume, in L, of 10.0 M HCl is needed to make 2.00 L of 2.00 M HCl solution by dilution with water?

A) 0.800 L
B) 0.400 L
C) 0.200 L
D) 0.100 L
E) None of these choices are correct.

Question 5

How many moles of H⁺(aq) ions are present in 750 mL of 0.65 M hydrochloric acid?

A) 1.2 mol
B) 0.98 mol
C) 0.87 mol
D) 0.65 mol
E) 0.49 mol

Question 6

Which of the following is most soluble in water?

A) benzene, C₆H₆
B) potassium nitrate, KNO₃
C) carbon tetrachloride, CCl₄
D) hexane, C₆H₁₄
E) ethane, C₂H₄

Question 7

Which of the following will be least soluble in water?

A) potassium sulfate, K₂SO₄
B) ammonium nitrate, NH₄NO₃
C) chloromethane, CH₃Cl
D) calcium chloride, CaCl₂
E) ethanol, C₂H₆O

Question 8

Sodium chlorate is used as an oxidizer in the manufacture of dyes, explosives, and matches. Calculate the mass of solute needed to prepare 1.575 L of 0.00250 M NaClO₃ ( = 106.45 g/mol).

A) 419 g
B) 169 g
C) 0.419 g
D) 0.169 g
E) 0.00394 g

Question 9

When 2.61 g of solid Na₂CO₃ is dissolved in sufficient water to make 250. mL of solution, the concentration of Na₂CO₃ is:

A) 0.0246 M
B) 10.4 M
C) 0.205 M
D) 0.0985 M
E) 0.141 M

Question 10

How many moles of H+(aq) ions are present in 1.25 L of 0.75 M nitric acid?

A) 0.60 mol
B) 0.75 mol
C) 0.94 mol
D) 1.7 mol
E) 1.9 mol

Question 11

How many moles of ions are released when 1.6 mol of ammonium phosphate, (NH₄)₃PO₄, is dissolved in water?

A) 0.40 mol
B) 1.6 mol
C) 3.2 mol
D) 4.8 mol
E) 6.4 mol

Question 12

Calculate the molarity of a 23.55-mL solution which contains 28.24 mg of sodium sulfate (used in dyeing and printing textiles, = 139.04 g/mol).

A) 8.625 M
B) 1.199 M
C) 0.8339 M
D) 0.2031 M
E) 0.008625 M

Question 13

What will be the final volume of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M?

A) 330 mL
B) 210 mL
C) 86 mL
D) 60 mL
E) 7.3 mL

Question 14

How many mL of concentrated nitric acid (HNO₃, 16.0 M) should be diluted with water in order to make 2.00 L of 2.00 M solution?

A) 32.0 mL
B) 62.5 mL
C) 125 mL
D) 250. mL
E) 500. mL

Question 15

How many sodium ions are present in 325 mL of 0.850 M Na₂SO₄?

A) 1.66 × 10²³ sodium ions
B) 3.33 × 10²³ sodium ions
C) 4.99 × 10²³ sodium ions
D) 6.20 × 10²³ sodium ions
E) 1.57 × 10²⁴ sodium ions

Question 16

Hydrochloric acid is widely used as a laboratory reagent in refining ore for the production of tin and tantalum, and as a catalyst in organic reactions. Calculate the number of moles of HCl in 62.85 mL of 0.453 M hydrochloric acid.

A) 28.5 mol
B) 1.04 mol
C) 0.139 mol
D) 0.0285 mol
E) 0.00721 mol

Question 17

How many moles of ions are released when 0.27 mol of cobalt(II) chloride, CoCl₂, is dissolved in water?

A) 0.81 mol
B) 0.54 mol
C) 0.27 mol
D) 0.18 mol
E) 0.090 mol

Question 18

Potassium carbonate, K₂CO₃, sodium iodide, NaI, potassium bromide, KBr, methanol, CH₃OH, and ammonium chloride, NH₄Cl, are soluble in water. Which produces the largest number of dissolved particles per mole of dissolved solute?

A) K₂CO₃
B) NaI
C) KBr
D) CH₃OH
E) NH₄Cl

Question 19

Lithium hydroxide is used in alkaline batteries. Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH in enough water to give a final volume of 750. mL.

A) 1.99 M
B) 1.50 M
C) 1.12 M
D) 0.502 M
E) 0.00199 M

Question 20

Potassium chloride, KCl, sodium sulfate, Na₂SO₄, glucose, C₆H₁₂O₆, carbon dioxide, CO₂ and ammonium phosphate, (NH₄)₃PO₄, are soluble in water. Which one produces the largest number of dissolved particles per mole of dissolved solute?

A) KCI
B) Na₂SO₄
C) C₆H₁₂O₆
D) CO₂
E) (NH₄)₃PO₄

Question 21

Which of the following solutions will be the best conductor of electrical current?

A) methyl alcohol, CH₃OH(aq)
B) glucose, C₆H₁₂O₆(aq)
C) potassium chloride, KCl(aq)
D) bromine, Br₂(aq)
E) ethylene glycol, C₂H₆O₂(aq)

Question 22

Consider the reaction: 3Co₂₊(aq) + 6NO₃(aq) + 6Na₊(aq) + 2PO₄3-(aq) → Co₃(PO₄)₂(s) + 6Na₊(aq) + 6NO₃(aq)
Identify the net ionic equation for this reaction.

A) Na⁺(aq) + NO₃^-(aq) → NaNO₃(aq)
B) 3Co²⁺(aq) + NO₃^-(aq) + Na⁺(aq) + 2PO₄^3-(aq) → Co₃(PO₄)₂(s) + NaNO₃(aq)
C) 3Co²⁺(aq) + 6NO₃^-(aq) + 6Na⁺(aq) + 2PO₄^3-(aq) → Co₃(PO₄)₂(s) + 6NaNO₃(aq)
D) 3Co²⁺(aq) + 2PO₄^3-(aq) → Co₃(PO₄)₂(s)
E) None of these choices are correct.

Question 23

Which one of the following substances is the best electrolyte?

A) CO
B) CH₃Cl
C) CH₄
D) C₂H₅OH
E) HCl

Question 24

Select the precipitate that forms when aqueous lead(II) nitrate reacts with aqueous sodium sulfate.

A) NaNO₃
B) Na₂NO₃
C) PbSO₄
D) Pb₂SO₄
E) PbS

Question 25

Select the net ionic equation for the reaction between sodium chloride and mercury(I) nitrate. 2NaCl(aq) + Hg₂(NO₃)₂(aq) → 2NaNO₃(aq) + Hg₂Cl₂(s)

A) Na⁺(aq) + NO₃^-(aq) → NaNO₃(aq)
B) Hg₂²⁺(aq) + 2Cl^-(aq) → Hg₂Cl₂(s)
C) NaCl(aq) → Na⁺(aq) + Cl^-(aq)
D) Hg₂(NO₃)₂(aq) → Hg₂²⁺(aq) + 2NO₃^-(aq)
E) Hg₂²⁺(aq) → Hg₂(s)

Question 26

Select the precipitate that forms when the following reactants are mixed. Na₂CO₃(aq) + BaCl₂(aq) →

A) Ba₂CO₃
B) BaCO₃
C) NaCl
D) NaCl₂
E) BaO

Question 27

Copper(II) sulfide, CuS, is used in the development of aniline black dye in textile printing. What is the maximum mass of CuS which can be formed when 38.0 mL of 0.500 M CuCl₂ are mixed with 42.0 mL of 0.600 M (NH₄)₂S? Aqueous ammonium chloride is the other product.

A) 2.41 g
B) 1.82 g
C) 1.21 g
D) 0.909 g
E) 0.044 g

Question 28

What, if any, are the spectator ions when aqueous solutions of HBr and RbOH neutralize each other?

A) H⁺ and OH^-
B) H⁺ and Rb⁺
C) Rb⁺ and Br^-
D) Br^- and OH^-
E) There are no spectator ions in this reaction.

Question 29

Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(II) nitrate.

A) CuS
B) Cu₂S
C) NH₄NO₃
D) NH₄(NO₃)₂
E) CuSO₄

Question 30

Which one of the following ionic compounds is soluble in water?

A) Na₂S
B) PbI₂
C) AgCl
D) CuS
E) Ca₃(PO₄)₂

Question 31

Magnesium carbonate, MgCO₃, is insoluble. Identify the spectator ions when aqueous solutions of sodium carbonate and magnesium chloride are combined.

A) Mg²⁺ and CO₃^2-
B) Na⁺ and Cl^-
C) Mg²⁺ and Cl^-
D) Na⁺ and CO₃^2-
E) None of these choices are correct.

Question 32

Which of the following solutions will be the poorest conductor of electrical current?

A) sucrose, C₁₂H₂₂O₁₁(aq)
B) sodium chloride, NaCl(aq)
C) potassium nitrate, KNO₃(aq)
D) lithium hydroxide, LiOH(aq)
E) sulfuric acid, H₂SO₄(aq)

Question 33

Which one of the following ionic compounds is insoluble in water?

A) Na₃PO₄
B) AgNO₃
C) NaCl
D) CaCO₃
E) MgCl₂

Question 34

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CuCl₂(aq) + Na₂CO₃(aq) →

A) copper(I) carbonate, Cu₂CO₃
B) copper(II) carbonate, Cu₂CO₃
C) copper(I) carbonate, CuCO₃
D) copper(II) carbonate, CuCO₃
E) sodium chloride, NaCl

Question 35

Which one of the following substances, when dissolved in water at equal molar concentrations, will give the solution with the lowest electrical conductivity?

A) CaCl₂
B) HNO₃
C) NH₃
D) C₆H₁₂O₆ (glucose)
E) CO₂

Question 36

1.0 M aqueous solutions of the following substances are prepared. Which one would you expect to have the lowest electrical conductivity?

A) NaOH
B) CH₃CH₂OH (ethanol)
C) KBr
D) CH₃COOH (acetic acid)
E) HClO₄

Question 37

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CoSO₄(aq) + (NH₄)₃PO₄(aq) →

A) cobalt(II) phosphate, Co₃(PO₄)₂
B) cobalt(III) phosphate, Co₃(PO₄)₂
C) cobalt(II) phosphate, CoPO₄
D) cobalt(III) phosphate, CoPO₄
E) ammonium sulfate, (NH₄)₂SO₄

Question 38

Select the precipitate that forms when the following reactants are mixed. Mg(CH₃COO)₂(aq) + LiOH(aq) →

A) LiCH₃COO
B) Li(CH₃COO)₂
C) MgOH
D) Mg(OH)₂
E) CH₃OH

Question 39

In the following reaction, what ions, if any, are spectator ions? Pb(NO₃)₂(aq) + 2NaCl(aq) → PbCl₂(s) + 2NaNO₃(aq)

A) Pb²⁺(aq), Cl^-(aq)
B) Na⁺(aq), NO₃^-(aq)
C) Pb²⁺(aq), NO₃^-(aq)
D) Na⁺(aq), Cl^-(aq)
E) There are no spectator ions.

Question 40

An acid

A) produces hydroxide ions when dissolved in water.
B) changes the color of phenolphthalein indicator from colorless to pink.
C) donates electrons in an electron transfer reaction.
D) donates protons in a proton transfer reaction.
E) None of these choices are correct.

Question 41

Ammonia, NH₃, produces hydroxide ions in aqueous solution by

A) donating a proton to an acid molecule.
B) donating a proton to a water molecule.
C) donating a hydrogen ion to a water molecule.
D) accepting an electron from an acid molecule.
E) accepting a proton from a water molecule.

Question 42

Select the correct set of products for the following reaction. Ba(OH)₂(aq) + HNO₃(aq) →

A) BaN₂(s) + H₂O(l)
B) Ba(NO₃)₂(aq) + H₂O(l)
C) Ba(s) + H₂(g) + NO₂(g)
D) Ba₂O(s) + NO₂(g) + H₂O(l)
E) No reaction occurs.

Question 43

A 0.00100 mol sample of Ca(OH)₂ requires 25.00 mL of aqueous HCl for neutralization according to the reaction below. What is the concentration of the HCl? Equation: Ca(OH)₂(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l)

A) 0.0200 M
B) 0.0400 M
C) 0.0800 M
D) 4.00 × 10^-5 M
E) None of these choices are correct.

Question 44

Which of the following is a weak base?

A) NH₃
B) Ca(OH)₂
C) Ba(OH)₂
D) NaOH
E) CH₃COOH

Question 45

Vinegar is a solution of acetic acid, CH₃COOH, dissolved in water. A 5.54-g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH. What is the percent by weight of acetic acid in the vinegar?

A) 0.184%
B) 1.63%
C) 3.26%
D) 5.43%
E) 9.23%

Question 46

Which, if any, of the following properties applies to weak acids?

A) They are strong electrolytes.
B) They are excellent conductors of electricity.
C) When dissolved in water, they do not ionize completely.
D) All of these choices are correct.
E) None of these choices are correct.

Question 47

A base

A) causes phenolphthalein indicator to change from colorless to pink.
B) donates a proton in a proton transfer reaction.
C) accepts electrons in an electron transfer reaction.
D) produces hydrogen ions in solution.
E) None of these choices are correct.

Question 48

A standard solution of 0.243 M NaOH was used to determine the concentration of a hydrochloric acid solution. If 46.33 mL of NaOH is needed to neutralize 10.00 mL of the acid, what is the molar concentration of the acid?

A) 0.0524 M
B) 0.888 M
C) 1.13 M
D) 2.26 M
E) 2.43 M

Question 49

How many milliliters of 1.58 M HCl are needed to react completely with 23.2 g of NaHCO₃ ( = 84.02 g/mol)? HCl(aq) + NaHCO₃(s) → NaCl(s) + H₂O(l) + CO₂(g)

A) 638 mL
B) 572 mL
C) 536 mL
D) 276 mL
E) 175 mL

Question 50

Sodium tripolyphosphate is used in detergents to make them effective in hard water. Calculate the oxidation number of phosphorus in Na₅P₃O₁₀.

A) +3
B) +5
C) +10
D) +15
E) None of these choices are correct.

Question 51

Which of the following is a strong acid?

A) H₃PO₄
B) HNO₃
C) HF
D) CH₃COOH
E) H₂O

Question 52

Select the best statement relating to the following reaction: 2MnO₂(s) + KClO₃(aq) + 2KOH(aq) → 2KMnO₄(aq) + KCl(aq) + H₂O(l)

A) Mn in MnO₂ is oxidized.
B) O in KClO₃ is the oxidizing agent.
C) K in KClO₃ is the reducing agent.
D) H in KOH is oxidized.
E) Cl in KClO₃ is the reducing agent.

Question 53

Which of the following is a strong base?

A) NH₃
B) Ca(OH)₂
C) Al(OH)₃
D) B(OH)₃
E) CH₃OH

Question 54

Calculate the oxidation number of sulfur in sodium metabisulfite, Na₂S₂O₅.

A) -2
B) +2
C) +4
D) +5
E) None of these choices are correct.

Question 55

Calculate the oxidation number of the chlorine in perchloric acid, HClO₄, a strong oxidizing agent.

A) -1
B) +4
C) +5
D) +7
E) None of these choices are correct.

Question 56

Which of the following is a weak acid?

A) H₂SO₄
B) HNO₃
C) HF
D) HBr
E) HCl

Question 57

Automobile batteries use 3.0 M H₂SO₄ as an electrolyte. How much 1.20 M NaOH will be needed to neutralize 225 mL of battery acid? H₂SO₄(aq) + 2NaOH(aq) → 2H₂O(l) + Na₂SO₄(aq)

A) 0.045 L
B) 0.28 L
C) 0.56 L
D) 0.90 L
E) 1.1 L

Question 58

In a redox reaction, electrons are transferred

A) from the substance being oxidized to the reducing agent.
B) from the oxidizing agent to the reducing agent.
C) from the substance being reduced to the oxidizing agent.
D) from the substance being oxidized to the substance being reduced.
E) from the substance being reduced to the substance being oxidized.

Question 59

Which one of the following substances is a strong acid?

A) HNO₃
B) H₂CO₃
C) NH₃
D) CH₃COOH
E) H₃PO₄

Question 60

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq) + HBr(aq) → H₂O(l) + LiBr(aq)

A) LiOH(aq) → Li⁺(aq) + OH^-(aq)
B) HBr(aq) → H⁺(aq) + Br^-(aq)
C) H⁺(aq) + OH^-(aq) → H₂O(l)
D) Li⁺(aq) + Br^-(aq) → LiBr(aq)
E) Li⁺(aq) + OH^-(aq) + H⁺(aq) + Br^-(aq) → H₂O(l) + LiBr(aq)

Question 61

Identify the oxidizing agent in the following redox reaction. Hg₂₊(aq) + Cu(s) → Cu₂₊(aq) + Hg(l)

A) Hg²⁺(aq)
B) Cu(s)
C) Cu²⁺(aq)
D) Hg(l)
E) Hg²⁺(aq) and Cu²⁺(aq)

Question 62

Which one of the following is not a redox reaction?

A) 2H₂O₂(aq) → 2H₂O(l) + O₂(g)
B) N₂(g) + 3H₂(g) → 2NH₃(g)
C) BaCl₂(aq) + K₂CrO₄(aq) → BaCrO₄(aq) + 2KCl(aq)
D) 2Al(s) + Fe₂O₃(s) → Al₂O₃(s) + 2Fe(s)
E) 2H₂O(g) → 2H₂(g) + O₂(g)

Question 63

Sodium thiosulfate, Na₂S₂O₃, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. 2S₂O₃^2-(aq) + I₂(aq) → S₄O₆^2-(aq) + 2I^-(aq)

A) I₂(aq)
B) I^-(aq)
C) S₂O₃^2-(aq)
D) S₄O₆^2-(aq)
E) S₂O₃^2-(aq) and I^-(aq)

Question 64

Which of the statements below correctly describes the combustion of glucose, shown below? C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

A) Hydrogen in C₆H₁₂O₆ is being reduced.
B) Oxygen in O₂ is being oxidized.
C) Hydrogen in C₆H₁₂O₆ is the reducing agent.
D) Oxygen in C₆H₁₂O₆ is the oxidizing agent.
E) Carbon in C₆H₁₂O₆ is being oxidized.

Question 65

The amount of calcium present in milk can be determined by adding oxalate to a sample and measuring the mass of calcium oxalate precipitated. What is the mass percent of calcium if 0.429 g of calcium oxalate forms in a 125-g sample of milk when excess aqueous sodium oxalate is added? Na₂C₂O₄(aq) + Ca²⁺(aq) → CaC₂O₄(s) + 2Na⁺(aq)

A) 0.107%
B) 0.202%
C) 0.343%
D) 1.10%
E) 1.37%

Question 66

Select the classification for the following reaction. KOH(aq) + HCl(aq) → KCl(aq) + H₂O(l)

A) Precipitation
B) Acid-base
C) Redox
D) Combination
E) None of these choices are correct.

Question 67

Select the classification for the following reaction. H₂(g) + Cl₂(g) → 2HCl(g)

A) Combination
B) Decomposition
C) Displacement
D) Acid-base
E) None of these choices are correct.

Question 68

Select the classification for the following reaction. NH₃(aq) + HNO₃(aq) → NH₄NO₃(aq)

A) Precipitation
B) Acid-base
C) Redox
D) Decomposition
E) None of these choices are correct.

Question 69

Aqueous potassium iodate (KIO₃) and potassium iodide (KI) react in the presence of dilute hydrochloric acid, as shown below. KIO₃(aq) + 5KI(aq) + 6HCl(aq) → 3I₂(aq) + 6KCl(aq) + 3H₂O(l)
What mass of iodine (I₂) is formed when 50.0 mL of 0.020 M KIO₃ solution reacts with an excess of KI and HCl?

A) 0.13 g I₂
B) 0.25 g I₂
C) 0.38 g I₂
D) 0.76 g I₂
E) None of these choices are correct.

Question 70

The oxidation numbers of P, S, and Cl in H₂PO₂^-, H₂S, and KClO₄ are, respectively

A) -1, -1, +3.
B) -1, -2, +7.
C) +1, -2, +7.
D) -1, -2, +3.
E) +1, +2, +7.

Question 71

Select the classification for the following reaction. 2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g)

A) Precipitation
B) Acid-base
C) Redox
D) Combination
E) None of these choices are correct.

Question 72

Which one of the following is a redox reaction?

A) 2Na(g) + Cl₂(g) → 2NaCl(s)
B) Ba²⁺(aq) + SO₄^2-(aq) → BaSO₄(s)
C) K₂Cr₂O₇(aq) + 2KOH(aq) → 2K₂CrO₄(aq) + H₂O(l)
D) Na₂CO₃(s) + 2HCl(aq) → 2NaCl(aq) + CO₂(g) + H₂O(l)
E) H₂O(l) → H⁺(aq) + OH^-(aq)

Question 73

Identify all the spectator ions in the following reaction. 2KMnO₄(aq) + 10FeSO₄(aq) + 8H₂SO₄(aq) → K₂SO₄(aq) + 2MnSO₄(aq) + 5Fe₂(SO₄)₃(aq) +8H₂O(l)

A) only K⁺
B) only SO₄^2-
C) only K⁺ and SO₄^2-
D) only K⁺, SO₄^2-, and Fe²⁺
E) only K⁺, SO₄^2-, Fe²⁺, and Mn²⁺

Question 74

Select the classification for the following reaction. Fe₂₊(aq) + 2OH_-(aq) → Fe(OH)₂(s)

A) Precipitation
B) Acid-base
C) Redox
D) Decomposition
E) None of these choices are correct.

Question 75

Aqueous potassium iodate (KIO₃) and potassium iodide (KI) react in the presence of dilute hydrochloric acid (HCl), as shown below. KIO₃(aq) + 5KI(aq) + 6HCl(aq) → 3I₂(aq) + 6KCl(aq) + 3H₂O(l)
What mass of iodine (I₂) is formed when 15.0 mL of 0.0050 M KIO₃ solution reacts with 30.0 mL of 0.010 M KI solution in the presence of excess HCl?

A) 0.023 g I₂
B) 0.029 g I₂
C) 0.057 g I₂
D) 0.046 g I₂
E) 0.076 g I₂

Question 76

Select the classification for the following reaction. BaCl₂(aq) + K₂SO₄(aq) → BaSO₄(s) + 2KCl(aq)

A) Precipitation
B) Acid-base
C) Redox
D) Decomposition
E) None of these choices are correct.

Question 77

Which one of the following is not a redox reaction?

A) 2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g)
B) H₂(g) + Cl₂(g) → 2HCl(g)
C) 2H₂O₂(aq) → 2H₂O(l) + O₂(g)
D) Fe₂O₃(s) + 3H₂SO₄(aq) → Fe₂(SO₄)₃(aq) + 3H₂O(l)
E) 2KMnO₄(aq) + 10FeSO₄(aq) + 8H₂SO₄(aq) → K₂SO₄(aq) + 2MnSO₄(aq) + 5Fe₂(SO₄)₃(aq) + 8H₂O(l)

Question 78

What is the oxidation number of iodine in I₂.

A) -1
B) 0
C) +1
D) +7
E) None of these choices are correct.

Question 79

Select the classification for the following reaction. Fe(s) + 2Fe₃₊(aq) → 3Fe₂₊(aq)

A) Precipitation
B) Acid-base
C) Redox
D) Decomposition
E) None of these choices are correct.

Question 80

Which one of the following is not a redox reaction?

A) 2H₂(g) + O₂(g) → 2H₂O(l)
B) Zn(s) + H₂SO₄(aq) → ZnSO₄(aq) + H₂(g)
C) H₂O(l) + NH₃(g) → NH₄⁺(aq) + OH^-(aq)
D) 6FeSO₄(aq) + K₂Cr₂O₇(aq) + 7H₂SO₄(aq) → Cr₂(SO₄)₃(aq) + 3Fe₂(SO₄)₃(aq) + K₂SO₄(aq) + 7H₂O(l)
E) Cl₂(g) + 2KBr(aq) → Br₂(l) + 2KCl(aq)