JEE Main 2014 · 19 Apr · Shift 1 · Chemistry Q41

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ChemistrySingle correct+4 / -1Question 41 of 90

Consider the reaction :
$\ce{H2SO3_{(aq)} + Sn^{4+}_{(aq)} + H2O_{(l)} -> Sn^{2+}_{(aq)} + HSO4^-_{(aq)} + 3H^+_{(aq)}}$
Which of the following statements is correct ?

\ce{Sn^4+}

is the oxidizing agent because it undergoes oxidation

\ce{Sn^4+}

is the reducing agent because it undergoes oxidation

\ce{H2SO3}

is the reducing agent because it undergoes oxidation

\ce{H2SO3}

is the reducing agent because it undergoes reduction

Answer and worked solution

Official answer: C

S goes from +4 in $\ce{H2SO3}$ to +6 in $\ce{HSO4-}$ : it is oxidised, so $\ce{H2SO3}$ is the reducing agent. $\ce{Sn^4+}$ is reduced to $\ce{Sn^2+}$ and is the oxidising agent.

Topics:Oxidation number

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JEE Main 2014 · 19 Apr · Shift 1, Chemistry question 41