Oxford IB Diploma Programme Chemistry Course Companion>Chapter 9 - Redox Processes>Questions>Q 8

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IMPORTANT

Earn 100

Metal A is more reactive than metal B. A standard voltaic cell is made as shown figure.

Which statement is correct?

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Important Questions on Redox Processes

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Oxford IB Diploma Programme Chemistry Course Companion>Chapter 9 - Redox Processes>Questions>Q 9

A

0.1337 g

sample of an alkali metal iodate,

{XIO}_{3}

, was dissolved in water, acidified, and an excess of potassium iodide,

KI

added. The resulting iodine solution required

36.64 {cm}^{3}

of the sodium thiosulphate pentahydrate solution,

{Na}_{2} S_{2} O_{3} . 5 H_{2} O (25.49 g {dm}^{- 3})

for complete titration using starch solution as an indicator. Calculate the relative atomic mass of

X

and hence identify the metal. Deduce all relevant half-equations involved.

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Oxford IB Diploma Programme Chemistry Course Companion>Chapter 9 - Redox Processes>Questions>Q 10

Describe how the dissolved oxygen concentration in a river would decrease if a car factory releases warm water into the river after using it for cooling.

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Oxford IB Diploma Programme Chemistry Course Companion>Chapter 9 - Redox Processes>Questions>Q 10

Describe how the dissolved oxygen concentration in a river would decrease if a farmer puts large quantities of a fertilizer on a field next to the river.

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Diploma

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Oxford IB Diploma Programme Chemistry Course Companion>Chapter 9 - Redox Processes>Questions>Q 11

Describe how the addition of nitrates or phosphates to water can increase the BOD value of a water sample.