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Which of the following statements regarding oxidation-reduction reactions is correct

Which of the following statements regarding oxidation-reduction reactions is correct

Which of the following statements regarding oxidation-reduction reactions is correct?

A)Oxidation-reduction reactions involve sharing electrons.

B)Oxidation can occur without reduction.

C)You can tell that a substance is oxidized if it loses electrons.

D)You can tell that a substance is reduced if its oxidation number increases.

E)None of these statements is correct.

 

2.              All of these statements concerning oxidation are correct except that

A)oxygen is necessary for oxidation to take place.

B)the oxidizing agent receives electrons from another species.

C)oxidation must accompany reduction.

D)the oxidizing agent increases the oxidation number of another element.

E)the oxidation of a metal produces positive ions.

 

3.              Which one of the following reactions is an example of an oxidation-reduction reaction?

A)BaO(s) + CO2(g) ? BaCO3(s)

B)H2(g) + F2(g) ? 2HF(g)

C)CaCO3(s)  ? CaO(s) + CO2(g)

D)HCl(aq) + NaOH(aq) ? NaCl(aq) + H2O(l)

E)Ba2+(aq) + SO42–(aq) ? BaSO4(s)

 

4.              Which of the following reactions is not an oxidation-reduction reaction?

A)C(s) + CO2(g) ? CO2(g)

B)CO(g) + Cl2(g) ? COCl2(g)

C)2H2O2(l) ? 2H2O(l) + O2(g)

D)CaCO3(s) + 2HCl(aq) ? CaCl2(aq) + CO2(g) + H2O(l)

E)2HI(g) ? H2(g) + I2(g)

 

5.              When a strip of zinc metal is placed in a blue aqueous solution of copper(II) sulfate, the surface of the zinc becomes coated with a reddish solid, and the zinc begins to dissolve to form aqueous zinc sulfate.  Which of the following statements regarding this reaction is correct?

A)The copper(II) is being oxidized.

B)The zinc is being reduced.

C)The sulfate ion is being reduced.

D)The solution will lose its blue color as the reaction progresses.

E)The reaction described is nonspontaneous.

 

6.              When a piece of copper wire is placed in a colorless solution of silver nitrate, the surface of the wire becomes coated with a shiny silvery material, and the copper begins to form aqueous copper(II) nitrate, which is blue.  Which of the following statements regarding this reaction is correct?

A)The copper(II) is being oxidized.

B)The silver ion is being oxidized.

C)The nitrate ion is being reduced.

D)The solution will become more blue as the reaction progresses.

E)The reaction described is nonspontaneous.

 

7.              Consider the following reaction:

Mg(s) + ZnSO4(aq) ? MgSO4(aq) + Zn(s)

Which of the following statements regarding this reaction is correct?

A)Magnesium is neither oxidized nor reduced.

B)The sulfate ion is reduced.

C)Zinc is the reducing agent.

D)Magnesium is the oxidizing agent.

E)Zinc gains two electrons.

 

8.              Consider the following reaction:

Mn(s) + CuSO4(aq) ? MnSO4(aq) + Cu(s)

Which of the following statements regarding this reaction is correct?

A)Manganese is neither oxidized nor reduced.

B)The sulfate ion is oxidized.

C)Copper is the reducing agent.

D)Manganese is the oxidizing agent.

E)Each copper gains two electrons.

 

9.              Consider the following reaction:

Mg(s) + NiSO4(aq) ? MgSO4(aq) + Ni(s)

Which of the following statements regarding this reaction is correct?

A)Each magnesium atom gains two electrons.

B)The sulfate ion is reduced.

C)Nickel ion is the oxidizing agent.

D)Magnesium is reduced.

E)Each nickel ion loses two electrons.

 

10.              In which of the following choices is the oxidation number incorrect?

A)Fe2+(aq); oxidation number = 2+D)Cu2+(aq); oxidation number = 2+

B)Cl?(aq); oxidation number = 1–E)C(s); oxidation number = 0

C)H2(s); oxidation number = 1+

abhinav behal 15-Feb-2020

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