JEE Main 2014 · 19 Apr · Shift 1 · Chemistry Q42

← JEE Main 2014 · 19 Apr · Shift 1

ChemistrySingle correct+4 / -1Question 42 of 90

Which one of the following has largest ionic radius ?

\ce{Li+}

\ce{O2^2-}

\ce{B^3+}

\ce{F-}

Answer and worked solution

Official answer: B

The peroxide ion $\ce{O2^2-}$ is a diatomic anion and much larger than the small cations $\ce{Li+}$ and $\ce{B^3+}$ , and also larger than $\ce{F-}$ (133 pm).

Topics:Atomic and ionic radii

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JEE Main 2014 · 19 Apr · Shift 1, Chemistry question 42