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Redox Reactions question

2009 · Q129
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Redox Reactions question

2009 · Q129

NEETChemistryRedox ReactionsMCQ+4 / −1
Oxidation numbers of P in PO43−_4^{3 - }43−​, of S in SO42−_4^{2 - }42−​ and that of Cr in Cr2O72−_7^{2 - }72−​ are respectively
  1. A
    +3, +6 and +5
  2. B
    +5, +3 and +6
  3. C
    −-−3, +6 and + 6
  4. D
    +5, +6 and +6
View written solutionFree

Correct answer: D

Let oxidation number of P in PO4 3– be x.

∴\therefore∴ x + 4(–2) = –3

⇒\Rightarrow⇒ x = +5

Let oxidation number of S in SO4 2– be y.

∴\therefore∴ y + 4(–2) = –2

⇒\Rightarrow⇒ y = +6

Let oxidation number of Cr in Cr2O7 2– be z.

⇒\Rightarrow⇒ 2z + 7(–2) = –2

⇒\Rightarrow⇒ z = +6

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