WCH0 QR Dynamic Papers Chemistry al Edexcel

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Edexcel | Chemistry WCH0 | S 16 5 1 | 1 hour 45 minutes

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3

(a)

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1 Mark

Excess potassium iodide solution is added to acidified potassium manganate(VII) solution.

The reaction taking place is

The iodine produced is titrated, with sodium thiosulfate solution in the burette.

The mole ratio of

A 1:2

B 1:5

C 2:5

D 5:1

B

3

(b)

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1 Mark

(b) The titration is carried out without starch indicator.

The colour change at the end point of the titration is

A brown to yellow.

B purple to colourless.

C purple to brown.

D yellow to colourless.

D

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