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The plot that correctly represent the trend of the Lanthanide ions in they tri-positive form is

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answer is D.

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Detailed Solution

Atomic size of lanthanide elements increases on increasing the atomic number due to poor shielding effect of 4f electrons (lanthanide contraction).

Similarly, the atomic size of trivalent ionic size of lanthanide elements also decreases on increasing the atomic number.

The correct option is d.

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