1. Tardigrade
  2. Question
  3. Chemistry
  4. Which statements among the following are correct? I. C e+3 is an oxidizing agent colourless. II. L u3+ is colourless. III. Actinoids exhibit a higher number of oxidation states than lanthanoid IV. All 3 d elements give H2 with 1 M HCl

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Q. 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 $3 d$ elements give $H_{2}$ with $1\, M\, HCl$

NTA AbhyasNTA Abhyas 2020The d-and f-Block Elements

Solution:

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 $1\,M\, HCl$