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The colour changes observed when testing for reducing agents using acidified potassium heptaoxodichromate (VI) solution...

Chemistry
JAMB 2009

The colour changes observed when testing for reducing agents using acidified potassium heptaoxodichromate (VI) solution is?

  • A. yellow to purple
  • B. orange to green
  • C. green to orange
  • D. purple to yellow
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Correct Answer: Option B
Explanation

Reducing agent like SO\(_2\).

Sulphur dioxide gas (SO\(_2\)) is bubbled through acidified potassium dichromate. The orange solution turns green.

There is an explanation video available below.

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Explanation Video

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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts