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NTA Abhyas JEE Main2020Chemistryd and f Block ElementsPractice

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

Options

  1. AII, III
  2. BI, III
  3. CI, II, III
  4. DI, IV

Correct answer

C. I, II, III

Step-by-step 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 1M HCl

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