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The oxidation of chromium in Cr\(_2\)O\(_7)\(-2\) ?

Chemistry
WAEC 2019

The oxidation of chromium in Cr\(_2\)O\(_7)\(-2\) ?

  • A. +4
  • B. +5
  • C. +6
  • D. +7
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Correct Answer: Option C
Explanation

2 atoms of Cr,

7 X -2 atoms of O

2Cr - 14 = -2

2Cr = -2 + 14

2Cr = 12

Cr = 6

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