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JEE Main 20178 AprilOnline
Exam
JEE Main
Year
2017
Date
8 April
Mode
Online
Subject
Chemistry
Chapter
Redox Reactions

JEE Main 2017 · 8 April · Online · Chemistry · Redox Reactions

The pair of compounds having metals in their highest oxidation...

The pair of compounds having metals in their highest oxidation state is

Options

  1. AMn2O7andCrO2Cl2.{Mn}_{2}{O}_{7}and{CrO}_{2}{Cl}_{2 .}
  2. B[Fe(CN)6]3−and[Cu(CN)4]2−.{\left[Fe{\left(CN\right)}_{6}\right]}^{3 -}and{\left[Cu{\left(CN\right)}_{4}\right]}^{2 -} .
  3. C[NiCl4]2−and[CoCl4]2−.{\left[{NiCl}_{4}\right]}^{2 -}and{\left[{CoCl}_{4}\right]}^{2 -} .
  4. D[FeCl4]−andCo2O3.{\left[{FeCl}_{4}\right]}^{-}and{Co}_{2}{O}_{3 .}

Correct answer

A. Mn2O7andCrO2Cl2.{Mn}_{2}{O}_{7}and{CrO}_{2}{Cl}_{2 .}

Step-by-step solution

Mn2O7{Mn}_{2}{O}_{7}

2x+7(−2)=0x=7\begin{array}{ll}2x + 7( - 2 ) = 0 \\ x = 7\end{array}

CrO2Cl2{CrO}_{2}{Cl}_{2}

x+2(−2)+2(−1)x=6\begin{array}{ll}x + 2( - 2 ) + 2( - 1 ) \\ x = 6\end{array}
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