Aqueous potassium iodide, KI, can be used as a test reagent in redox reactions. Iodide ions are readily ……X…… . A positive result for the test is when the solution changes colour from ……Y…… to ……Z…… . Which words correctly complete gaps X, Y and Z?

5070_s14_qp_11

MCQ

2014

Paper 1, Variant 1

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The table gives some information about four redox reactions. Which row gives correct information about what is oxidised and the evidence that this is oxidation?

5070_s22_qp_11

MCQ

2022

Paper 1, Variant 1

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Chlorine reacts with aqueous sodium bromide to form aqueous sodium chloride and bromine. Which statement about this reaction is correct?

5070_s24_qp_12

MCQ

2024

Paper 1, Variant 2

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Which of the reactions X, Y and Z involve oxidation?

5070_w06_qp_1

MCQ

2006

Paper 1, Variant 0

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Which statement describes the conversion of magnesium atoms to magnesium ions?

5070_w08_qp_1

MCQ

2008

Paper 1, Variant 0

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Which graph corresponds to the catalytic decomposition of 1 mole of hydrogen peroxide?

5070_w09_qp_1

MCQ

2009

Paper 1, Variant 0

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Which statement describes the conversion of magnesium atoms to magnesium ions?

5070_w13_qp_11

MCQ

2013

Paper 1, Variant 1

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Which statement describes the conversion of magnesium atoms to magnesium ions?

5070_w13_qp_12

MCQ

2013

Paper 1, Variant 2

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Which equation represents a redox reaction?

5070_w13_qp_12

MCQ

2013

Paper 1, Variant 2

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An element is burned in an excess of oxygen. Which statement about the oxide formed is always correct?

5070_w15_qp_11

MCQ

2015

Paper 1, Variant 1

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