Question 1

Which of the following statements best describes oxidation in a redox reaction?

Accepted Answer

Oxidation is the loss of electrons by an atom or ion.

Question 2

What is the oxidation number of oxygen in hydrogen peroxide ($$\mathrm{H_2O_2}$$)?

Accepted Answer

$$-1$$

Question 3

In the reaction $$\mathrm{Zn(s) + $$CuSO_4$$(aq) \rightarrow $$ZnSO_4$$(aq) + Cu(s)}$$, which species is oxidized and which is reduced?

Accepted Answer

Zinc is oxidized; copper ion is reduced.

Question 4

Assign the oxidation state to chromium in $$\mathrm{Cr_2O_7$$^{2-}$$}.$$

Accepted Answer

$$+6$$

Question 5

Which of the following compounds contains hydrogen with an oxidation state of $$-1$$?

Accepted Answer

$$\mathrm{NaH}$$

Question 6

A student dissolves $$23.4\ \mathrm{g} of$$ $$\mathrm{Na_2SO_4} in $$enough water to make $$125\ \mathrm{mL} of $$solution. What is the molarity of the solution? ($$\mathrm{M_{Na_2SO_4}} = 142.04\ \mathrm{g/mol})$$

Accepted Answer

$$0.165\ \mathrm{M}$$

Question 7

Which of the following metals is the easiest to oxidize?

Accepted Answer

Sodium ($$\mathrm{Na})$$

Question 8

What is the sum of the oxidation numbers in the polyatomic ion $$\mathrm{SO_4$^{2-}}$$?

Accepted Answer

$$-2$$

Question 9

Which statement is true about the oxidation number of fluorine in compounds?

Accepted Answer

Fluorine always has an oxidation number of $$-1.$$

Question 10

In the reaction $$\mathrm{Mg(s) + $$FeCl_2$$(aq) \rightarrow $$MgCl_2$$(aq) + Fe(s)}$$, what is the balanced net ionic equation?

Accepted Answer

$$\mathrm{Mg(s) + Fe$$^{2+}$$(aq) \rightarrow Mg$$^{2+}$$(aq) + Fe(s)}$$

Question 11

Which of the following is NOT a correct rule for assigning oxidation numbers?

Accepted Answer

Hydrogen is always $$+1$$ regardless of what it is bonded to.

Question 12

A $$250\ \mathrm{mL}$$ solution contains $$0.50\ \mathrm{mol} of$$ $$\mathrm{KCl}. $$What is the molarity of the solution?

Accepted Answer

$$0.20\ \mathrm{M}$$

Question 13

Which of the following statements about redox reactions is FALSE?

Accepted Answer

Oxidation can occur without reduction.

Question 14

In the reaction $$\mathrm{Al(s) + 6HBr(aq) \rightarrow 2AlBr_3(aq) + 3H_2(g)}$$, which element is reduced?

Accepted Answer

Hydrogen

Question 15

Which of the following ions has an oxidation number equal to its charge?

Accepted Answer

$$\mathrm{Na^+}$$

Question 16

A solution is prepared by dissolving $$5.00\ \mathrm{g} of$$ $$\mathrm{KCH_3COO} ($$potassium acetate, molar mass $$98.15\ \mathrm{g/mol}) in$$ $$200\ \mathrm{mL} of $$water. What is the molarity of the solution?

Accepted Answer

$$0.255\ \mathrm{M}$$

Question 17

Which of the following metals will NOT be oxidized by $$\mathrm{Pb(NO_3$)_2} in $$aqueous solution?

Accepted Answer

Copper ($$\mathrm{Cu})$$

Question 18

What is the oxidation state of tin in $$\mathrm{$$SnBr_4$$}$$?

Accepted Answer

$$+4$$

Question 19

Which of the following is a displacement reaction?

Accepted Answer

$$\mathrm{Mg(s) + $$FeCl_2$$(aq) \rightarrow $$MgCl_2$$(aq) + Fe(s)}$$

Oxidation-Reduction Reactions and Solution Stoichiometry

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