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Date	May 2013	Marks available	1	Reference code	13M.1.sl.TZ2.23
Level	SL	Paper	1	Time zone	TZ2
Command term	Identify	Question number	23	Adapted from	N/A

Question

Which statement describes a reducing agent?

A. It is reduced and gains electrons.

B. It is reduced and loses electrons.

C. It is oxidized and gains electrons.

D. It is oxidized and loses electrons.

Markscheme

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Syllabus sections

Core » Topic 9: Redox processes » 9.1 Oxidation and reduction

Show 165 related questions

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17N.1.sl.TZ0.21: What are the oxidation states of chromium in (NH4)2Cr2O7 (s) and Cr2O3 (s)?
17N.2.hl.TZ0.7d: Identify the best reducing agent in the table above.
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17M.3.sl.TZ2.5b.ii: Deduce the redox equation for the reaction of nickel(II) chloride solution with the metal...
17M.3.sl.TZ2.5b.i: Nickel is also used as a catalyst. It is processed from an ore until nickel(II) chloride...
17M.2.sl.TZ2.4a.iv: Deduce, giving a reason, which species is the reducing agent.
17M.2.sl.TZ2.4a.iii: Determine the oxidation state of nitrogen in the two reactants.
17M.2.sl.TZ2.2a.ii: Deduce the overall redox equation for the reaction between acidic Sn2+(aq) and Cr2O72–(aq),...
17M.2.sl.TZ2.2a.i: State the oxidation half-equation.
17M.1.hl.TZ2.36: Which compounds can be reduced? I. C2H4II. CH3COOHIII. CH3CHO A. I and II...
17M.1.hl.TZ2.28: Which element is reduced in the following decomposition? (NH4)2Cr2O7(s) → N2(g) + Cr2O3(s) +...
17M.1.sl.TZ2.22: Which of the following is not a redox reaction? A. CH4(g) + Cl2(g) → CH3Cl(g) +...
17M.1.sl.TZ2.21: Which element is reduced in the following decomposition? (NH4)2Cr2O7(s) → N2(g) + Cr2O3(s) +...
17M.1.sl.TZ2.19: Which of the following does not react with dilute HCl(aq)? A. Na2CO3 B. Cu C. ...
17M.2.hl.TZ1.4d: Suggest why experiments involving tetracarbonylnickel are very hazardous.
17M.2.hl.TZ1.4b: The nickel obtained from another ore, nickeliferous limonite, is contaminated with iron. Both...
17M.2.hl.TZ1.4a: Formulate an equation for the oxidation of nickel(II) sulfide to nickel(II) oxide.
17M.2.hl.TZ1.3c.i: Formulate an equation for the reaction between VO2+(aq) and V2+(aq) in acidic solution to...
17M.2.hl.TZ1.3b.ii: Identify, from the table, a non-vanadium species that could convert...
17M.2.hl.TZ1.3b.i: Identify, from the table, a non-vanadium species that can reduce VO2+(aq) to V3+(aq) but no...
17M.2.sl.TZ1.3b: Formulate an equation for the reaction between VO2+(aq) and V2+(aq) in acidic solution to...
17M.2.sl.TZ1.3a: Determine the oxidation state of vanadium in each of the following species.
17M.2.sl.TZ1.1a.i: Suggest how the change of iodine concentration could be followed.
17M.1.hl.TZ1.29: A reaction takes place when a rechargeable battery is used: Pb(s) + PbO2(s) + 4H+(aq) +...
17M.1.hl.TZ1.28: Which change represents oxidation? A. HClO4 to HClO3 B. N2 to NH3 C. N2O to...
17M.1.sl.TZ1.22: What is the oxidation half-equation in the redox reaction? 2S2O32–(aq) + I2(aq) → S4O62–(aq)...
17M.1.sl.TZ1.21: What is the order of decreasing reactivity of the metals (most reactive first)? Zn(s) +...
16N.3.sl.TZ0.1c: Despite widespread improvements in the provision of safe drinking water, the sale of bottled...
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16N.2.sl.TZ0.4g: Magnesium chloride can be electrolysed. Deduce the half-equations for the reactions at each...
16N.2.sl.TZ0.1b: Determine the average oxidation state of carbon in ethene and in...
16N.1.sl.TZ0.21: Which is a correct statement for the reaction below? 2MnO4-(aq) + 6H+(aq) + 5NO2-(aq) →...
16N.1.sl.TZ0.17: Which experimental methods could be used to observe the progress of the following...
16M.2.hl.TZ0.1b: Phosphine is usually prepared by heating white phosphorus, one of the allotropes of...
16M.2.sl.TZ0.1b: Phosphine is usually prepared by heating white phosphorus, one of the allotropes of...
16M.1.hl.TZ0.30: Applying IUPAC...
16M.1.sl.TZ0.21: Applying IUPAC rules, what is the name of MnO2? A. Magnesium(II) oxide B. Manganese(II)...
15M.1.hl.TZ1.30: Which represents a redox reaction? A. ...
15M.1.hl.TZ2.30: Which is a redox reaction? A. ...
15M.2.hl.TZ1.6e: Bromine reacts with aqueous sodium...
15M.2.hl.TZ1.7a.ii: Determine the oxidation number of carbon in ethanol and ethanal. Ethanol: Ethanal:
15M.2.hl.TZ1.7a.iii: Deduce the half-equation for the oxidation of ethanol to ethanal.
15M.2.hl.TZ1.7a.iv: Deduce the overall redox equation for the reaction of ethanol to ethanal with acidified...
15M.2.hl.TZ2.8b.i: State the name of \({\text{C}}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{3}}}\).
15M.2.hl.TZ2.8c.i: Chromium forms the complex ion...
15M.2.hl.TZ2.8d.i: The dichromate ion,...
15M.2.hl.TZ2.8d.ii: Explain in terms of oxidation numbers whether iodine is oxidized or reduced in part (d) (i).
15M.1.sl.TZ1.23: Which represents a redox reaction? A. ...
15M.1.sl.TZ1.24: Which species can oxidize ethanol to ethanoic acid? A. \({{\text{I}}^ - }\) B. ...
15M.1.sl.TZ2.23: What are the oxidation states of each element in...
15M.1.sl.TZ2.24: What is the coefficient for I– when the following equation is balanced using the smallest...
15M.2.sl.TZ1.2d: Bromine reacts with aqueous sodium...
15M.2.sl.TZ1.7c.iii: Deduce the half-equation for the oxidation of ethanol to ethanal.
15M.2.sl.TZ1.7c.ii: Determine the oxidation number of carbon in ethanol and ethanal. Ethanol: Ethanal:
15M.2.sl.TZ1.7c.iv: Deduce the overall redox equation for the reaction of ethanol to ethanal with acidified...
14M.1.hl.TZ2.31: Which species are the oxidizing and reducing agents in the following...
14M.2.hl.TZ1.6a: Alcohols with the molecular formula...
14M.2.hl.TZ2.5c: (i) Deduce a balanced equation for the reaction between the chlorate(I) ion and sulfur...
14M.1.sl.TZ2.23: What are the correct oxidation numbers of chromium in...
14M.2.sl.TZ1.6a: Define oxidation in terms of electron transfer.
14M.1.sl.TZ1.23: At which side of the equation are electrons, \({{\text{H}}^ + }\) ions and...
14M.1.sl.TZ1.24: What are the correct names for \({\text{KMn}}{{\text{O}}_{\text{4}}}\) and...
14M.2.sl.TZ1.6b: (i) Deduce the oxidation number of chromium in...
14M.2.sl.TZ2.4d: (i) Deduce the coefficients required to balance the half-equations given below. ___...
14M.3.sl.TZ1.16b: (i) \(1.50 \times {10^{ - 4}}{\text{ mol}}\) of \({{\text{I}}^ - }{\text{(aq)}}\) was...
14N.2.hl.TZ0.10a: (i) Identify whether half-equation 1 represents oxidation or reduction, giving a reason...
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14N.1.sl.TZ0.24: Which statement is correct for the following...
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13N.1.hl.TZ0.31: What is the name of \({\text{Mn}}{{\text{O}}_{\text{2}}}\)? A. Manganese(II) oxide B. ...
13N.1.hl.TZ0.32: Consider the following...
13N.2.hl.TZ0.6b.i: State the initial and final oxidation numbers of titanium and hence deduce whether it is...
13N.3.hl.TZ0.9b.iv: The reducing agent in the cytochrome oxidase reaction is a species that can be denoted as...
13N.1.sl.TZ0.24: Consider the following...
13N.2.sl.TZ0.5b.iii: Deduce which of the six species is the strongest oxidizing agent.
13N.1.sl.TZ0.23: What is the name of...
13N.2.sl.TZ0.5a.i: State the initial and final oxidation numbers of titanium and hence deduce whether it is...
13N.2.sl.TZ0.5b.i: Deduce which of the species would react with titanium metal.
13N.2.sl.TZ0.5b.ii: Deduce the balanced equation for this reaction.
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13M.2.hl.TZ1.4d: Deduce the half-equation involving ethanedioic acid.
13M.2.hl.TZ1.7b.iv: Deduce the oxidation number of iron in...
13M.1.sl.TZ1.23: Which statement is correct about a reducing agent? A. It is reduced by gaining...
13M.1.sl.TZ1.24: What is the correct increasing order of reactivity of the metals X, Y and Z based on the...
13M.2.sl.TZ1.4b: Calculate the change in oxidation numbers of carbon and...
13M.2.sl.TZ1.4a: Define oxidation in terms of electron transfer.
13M.2.sl.TZ1.4c: Identify the oxidizing and reducing agents. Oxidizing agent: Reducing agent:
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13M.3.sl.TZ1.D2b.iii: State the oxidation number of chromium in the product.
13M.2.hl.TZ2.7b.ii: Deduce the oxidizing and reducing agents in this reaction. Oxidizing agent: Reducing...
13M.2.hl.TZ2.7a: Define oxidation in terms of oxidation number.
13M.2.hl.TZ2.7b.i: Deduce the balanced chemical equation for the redox reaction of copper, Cu(s), with nitrate...
13M.2.hl.TZ2.7c.iii: Deduce a balanced chemical equation, including state symbols, for the overall reaction which...
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13M.2.sl.TZ2.1f.i: One titration was abandoned because a brown precipitate, manganese(IV) oxide, formed. State...
12N.1.sl.TZ0.23: What is the correct systematic name of MnO2? A. Manganese(II) oxide B. ...
12N.2.sl.TZ0.5a: (i) Define oxidation and reduction in terms of electron loss or...
10N.1.hl.TZ0.30: Consider the following...
10N.1.hl.TZ0.31: The following equations indicate reactions that occur...
10N.1.sl.TZ0.23: Consider the following...
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09N.1.sl.TZ0.24: Which are redox reactions? I. ...
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09N.2.sl.TZ0.1c: Calculate the amount, in moles, of \({\text{MnO}}_4^ - \) used in the titration.
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09N.2.sl.TZ0.1b: Identify the reducing agent in the reaction.
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09N.3.sl.TZ0.E2a: State what is meant by the term biochemical oxygen demand (BOD).
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10M.1.sl.TZ2.24: In which species does sulfur have an oxidation number of 0? A. ...
10M.1.sl.TZ2.25: What is the reducing agent in the reaction...
10M.2.sl.TZ2.5c: (i) Determine the oxidation number of lead in Pb,...
09M.2.hl.TZ1.4a.i: State the half-equation for the oxidation of the iron(II) ions.
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09M.2.hl.TZ1.4a.iii: Deduce the overall redox equation for the reaction.
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09M.2.hl.TZ1.7b.i: \({{\text{[Co(}}{{\text{H}}_{\text{2}}}{\text{O}}{{\text{)}}_{\text{6}}}{\text{]}}^{2 + }}\)
09M.2.hl.TZ1.7b.iii: \({{\text{[CoC}}{{\text{l}}_{\text{4}}}{\text{]}}^{2 - }}\)
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09M.2.sl.TZ1.4b.ii: Deduce which species has been oxidized in this reaction and state the change in oxidation...
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09M.3.sl.TZ1.D3b.ii: State with a reason whether chromium in potassium dichromate(VI) is oxidised or reduced by...
09M.3.sl.TZ1.E2c.ii: State the change in oxidation number for manganese in step 2.
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09M.1.sl.TZ2.24: Which species is oxidized in the following...
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11M.2.hl.TZ1.9e.ii: Deduce the oxidation and reduction half-equations and identify the oxidizing agent for the...
11M.1.sl.TZ1.23: Which species could be reduced to form \({\text{N}}{{\text{O}}_{\text{2}}}\)? A. ...
11M.1.sl.TZ1.25: What happens to the manganese in the following...
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11M.2.hl.TZ2.7d.ii: Deduce the oxidation number of chromium in...
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11M.2.sl.TZ2.2b.i: Deduce the chemical equations for these two reactions.
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