Which statements among the following are correct?

I. $C e^{+3}$ is an oxidizing agent & colourless.

II. $L u^{3 +}$ is colourless.

III. Actinoids exhibit a higher number of oxidation states than lanthanoid

IV. All 3d elements give $H_{2}$ with 1 M HCl

Question

TestHub · Accepted Answer

I. ​Ce +3 formation favoured by its noble gas configuration, but it is a strong oxidant reverting to the common +3 state and it is colourless. II. Lu 3+ is diamagnetic and colourless. III.​ Actinoids exhibit a higher number of oxidation states than lanthanoid IV. All 3d elements do not give H 2 with 1M HCl

Chemistry - f-block Question with Solution | TestHub

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