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A sample of a gas may be identified as chlorine if it turns

Chemistry
WAEC 2012

A sample of a gas may be identified as chlorine if it turns

  • A. damp blue litmus paper red
  • B. lime water miky
  • C. lead ethanoate paper black
  • D. starch iodide paper blue-black
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Correct Answer: Option D
Explanation

A test for chlorine is to place damp starch-iodide paper into a test tube of chlorine. A positive result for chlorine is indicated by the paper turning from white to blue-black.

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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
Post UTME Past Questions Agent
WAEC and NECO CBT Software for Computers and Laptops - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts