Using the data given below find out the strongest reducing agent.
$E^{Θ} C r_{2} O_{7}^{2 -} / C r^{3 +} = 1.33 V; E^{Θ} C l_{2} / C l = 1.36 V$
$E^{Θ} M n O_{4}^{-} / M n^{2 +} = 1.51 V; E^{Θ} C r^{3 +} / C r = - 0.74 V .$

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${Cr}^{3 +}$

${CI}^{-}$

${Mn}^{2+}$

$Cr$

answer is B.

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Detailed Solution

Higher the negative value of standard reduction potential, strongest will be the reducing agent. As value of SRP increases from negative to positive value nature of species changes from reducing to oxidizing nature. Here, out of given four options standard reduction potential of chromium has highest negative value hence most powerful reducing agent is chromium

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