1. Tardigrade
  2. Question
  3. Chemistry
  4. Which statements among the following are correct? I. Ce+ 4 is an oxidizing agent colourless. II. Lu3 + is colourless. III. Actinoids exhibit a higher number of oxidation states than lanthanoids. IV. All 3d elements give H2 with 1 M HCl.

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Q. Which statements among the following are correct?
I. $Ce^{+ 4}$ is an oxidizing agent & colourless.
II. $Lu^{3 +}$ is colourless.
III. Actinoids exhibit a higher number of oxidation states than lanthanoids.
IV. All $3d$ elements give $H_{2}$ with $1 \,M\, HCl$.

NTA AbhyasNTA Abhyas 2022

Solution:

I. $Ce ^{+4}$ 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 due to lower energy difference between the consecutive 5 fand6 $d$ energy levels.
IV. All $3 d$ elements do not give $H _2$ with $1 \,M \,HCl$