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The radius of $La^{3+} ($atomic number of $La = 57)$ is $1.06A.$ Which one of the following given values will be closest to the radius of $Lu^{3+}$? $($atomic number of $Lu = 71)$
When $\ce{KMnO_4}$ solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because