Section 6. Electrochemistry for Chemistry, A Level - revisedeck

6. Electrochemistry

A section of Chemistry, 9701

Listing 10 of 82 questions

The oxide of titanium, TiO2, is used as a ‘whitener’ in toothpaste. It is obtained from the ore iron(titanate, FeTiO3. What is the change, if any, in the oxidation number (oxidation state) of titanium in the reaction FeTiO3 → TiO2?

9701_s12_qp_13

MCQ

2012

Paper 1, Variant 3

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In oxygen difluoride, OF2, fluorine has an oxidation number of –1. OF2 will react with sulfur dioxide according to the following equation. OF2 + SO2 → SO3 + F2 What is oxidised and what is reduced in this reaction?

9701_s15_qp_11

MCQ

2015

Paper 1, Variant 1

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In industry, copper metal is purified by electrolysis. Which changes occur to the masses of the electrodes and to the colour of the electrolyte during this process?

9701_s15_qp_12

MCQ

2015

Paper 1, Variant 2

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Which of these reactions are redox reactions?

9701_s15_qp_12

MCQ

2015

Paper 1, Variant 2

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X is either nitrogen or sulfur and forms pollutant oxide Y in a car engine. Further oxidation of Y to Z occurs in the atmosphere. In this further oxidation, 1 mol of Y reacts with 0.5 mol of gaseous oxygen molecules. Which statements about X, Y and Z can be correct?

9701_s17_qp_11

MCQ

2017

Paper 1, Variant 1

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Phosphorus reacts with concentrated sulfuric acid to produce phosphoric acid, sulfur dioxide and water. aH2SO4 + bP  cH3PO4 + dSO2 + eH2O a, b, c, d and e are all whole numbers. The equation can be balanced by using oxidation numbers. What is the value of the sum a + b + c + d + e?

9701_s24_qp_12

MCQ

2024

Paper 1, Variant 2

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In an experiment, 50.0 cm3 of a 0.10 mol dm–3 solution of a metallic salt reacted exactly with 25.0 cm3 of 0.10 mol dm–3 aqueous sodium sulphite. The half-equation for oxidation of sulphite ion is shown...

9701_w07_qp_1

MCQ

2007

Paper 1, Variant 0

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Sulfur dioxide, SO2, is added to wines to prevent oxidation of ethanol by air. To determine the amount of SO2, a sample of wine is titrated with iodine, I2. In this reaction, one mole of SO2 is oxidised by one mole of I2. What is the change in oxidation number of sulfur in this reaction?

9701_w10_qp_11

MCQ

2010

Paper 1, Variant 1

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Sulfur dioxide, SO2, is added to wines to prevent oxidation of ethanol by air. To determine the amount of SO2, a sample of wine is titrated with iodine, I2. In this reaction, one mole of SO2 is oxidised by one mole of I2. What is the change in oxidation number of sulfur in this reaction?

9701_w10_qp_13

MCQ

2010

Paper 1, Variant 3

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In a car engine, non-metallic element X forms a pollutant oxide Y. Further oxidation of Y to Z occurs spontaneously in the atmosphere. In this further oxidation, 1 mol of Y reacts with 0.5 mol of gaseous oxygen. Which statements about X, Y and Z are correct?

9701_w11_qp_12

MCQ

2011

Paper 1, Variant 2

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Questions Discovered

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