The lanthanide ion that would |dandfBlockElementsJEEMain2019

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JEE MAIN 2019

08-04-2019 S1

Question

The lanthanide ion that would show colour is

Select the correct option:

$\mathrm{Gd}^{3+}$

$\mathrm{Lu}^{3+}$

$\mathrm{La}^{3+}$

$\mathrm{Sm}^{3+}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

$\begin{aligned} & S m^{+3}=\text { Partially filled } f \text { orbital }=4 f^5 \\ & S m=4 f^6 6 s^2 \\ & S m^{+3}=\text { Yellow } . \\ & L u^{+3}=4 f^{14} \text { colourless } .\end{aligned}$

Question Tags

JEE Main

Chemistry

Easy

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