JEE Main 2016 · 9 Apr · Shift 1 · Chemistry Q47

ChemistrySingle correct+4 / -1Question 47 of 90

Which one of the following species is stable in aqueous solution ?

\ce{Cr^2+}

\ce{Cu+}

\ce{MnO4^3-}

\ce{MnO4^2-}

Answer and worked solution

Official answer: D

$\ce{Cr^2+}$ is oxidised by water, $\ce{Cu+}$ and $\ce{MnO4^3-}$ disproportionate. Manganate $\ce{MnO4^2-}$ is stable in (alkaline) aqueous solution.

JEE Main 2016 · 9 Apr · Shift 1, Chemistry question 47