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Chemistry-

General

Easy

Question

The following facts are available $table row cell 2 X to the power of minus plus Y subscript 2 rightwards arrow 2 Y to the power of minus plus X subscript 2 end cell end table$ , $2 W to the power of minus plus Y subscript 2 rightwards arrow text No reaction end text$ , $2 Z to the power of minus plus X subscript 2 rightwards arrow 2 X to the power of minus plus Z subscript 2$ Which of the following is correct?

$E_{W^{-} / W_{2}}^{0} > E_{Y^{-} / Y_{2}}^{0} > E_{X^{-} / X_{2}}^{0} > E_{Z^{-} / Z_{2}}^{0}$
$E_{W^{-} / W_{2}}^{0} < E_{Y^{-} / Y_{2}}^{0} < E_{X^{-} / X_{2}}^{0} < E_{Z^{-} / Z_{2}}^{0}$
$E_{W^{-} / W_{2}}^{0} < E_{Y^{-} / Y_{2}}^{0} > E_{X^{-} / X_{2}}^{0} > E_{Z^{-} / z_{2}}^{0}$
$E_{W^{-} / w_{2}}^{\circ} > E_{Y^{-} / Y_{2}}^{\circ} < E_{X^{-} / x_{2}}^{\circ} < E_{Z^{-} / z_{2}}^{\circ}$

The correct answer is: $E subscript W to the power of minus end exponent divided by W subscript 2 end subscript end subscript superscript 0 end superscript less than E subscript Y to the power of minus end exponent divided by Y subscript 2 end subscript end subscript superscript 0 end superscript less than E subscript X to the power of minus end exponent divided by X subscript 2 end subscript end subscript superscript 0 end superscript less than E subscript Z to the power of minus end exponent divided by Z subscript 2 end subscript end subscript superscript 0 end superscript$

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The standard potentials at 298 K for the following half reactions are as given
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$table row cell Z n to the power of 2 plus end exponent left parenthesis a q right parenthesis plus 2 e to the power of minus end exponent rightwards harpoon over leftwards harpoon Z n left parenthesis s right parenthesis semicolon minus 0.762 V end cell row cell C r to the power of 3 plus end exponent left parenthesis a q right parenthesis plus 3 e to the power of minus end exponent rightwards harpoon over leftwards harpoon C r left parenthesis s right parenthesis semicolon minus 0.74 V end cell row cell 2 H to the power of plus end exponent left parenthesis a q right parenthesis plus 2 e to the power of minus end exponent rightwards harpoon over leftwards harpoon H subscript 2 end subscript left parenthesis g right parenthesis semicolon plus 0.00 V end cell row cell F e to the power of 3 plus end exponent left parenthesis a q right parenthesis plus e to the power of minus end exponent rightwards harpoon over leftwards harpoon F e to the power of 2 plus end exponent left parenthesis a q right parenthesis semicolon plus 0.77 V end cell end table$
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