Single Choice

Knowing that the Chemistry of lanthanoids $$(\mathrm{L}\mathrm{n})$$ is dominated by its $$+3$$ oxidation state, which of the following statements is incorrect?

ABecause of the large size of the $$\mathrm{L}\mathrm{n}$$ (III) ions the bonding in its compounds is predominantly ionic in character.
BThe ionic sizes of $$\mathrm{L}\mathrm{n}$$ (III) decrease in general with increasing atomic number.
C$$\mathrm{L}\mathrm{n}$$ (III) compounds are generally colourless
Correct Answer
D$$\mathrm{L}\mathrm{n}$$ (III) hydroxides are mainly basic in character.

Solution

Most of the Ln(III) compounds are coloured due to $$\mathrm{f}-\mathrm{f}$$ transition in solid as well as in aqueous phase. So, Ln (III) compounds are generally colourless is a wrong statement.

SIMILAR QUESTIONS

d - block and f - block Elements

Which of the following Lanthanoid is radioactive?

d - block and f - block Elements

The only radioactive element among the lanthanoids is

d - block and f - block Elements

Which of the following lanthanide is commonly used?

d - block and f - block Elements

In context of the lanthanoids, which of the following statements is not correct?

d - block and f - block Elements

Only lanthanide which is radioactive is:

d - block and f - block Elements

Choose the incorrect statement among the following:

d - block and f - block Elements

What is the general molecular formula of the products obtained on heating lanthanoids (Ln) with sulphur?

d - block and f - block Elements

Although $$+3$$ is the characteristic oxidization state for lanthanoids but cerium also shows $$+4$$ oxidation state because?

d - block and f - block Elements

Although $$+3$$ is the characteristic oxidization state for lanthanoids but cerium also shows $$+4$$ oxidation state because?

d - block and f - block Elements

Consider the following statements in respect of lanthanoids : (i) the basic strength of hydroxides of lanthanoids increases from $$ La(OH)_3\ to\ Lu(OH)_3 $$ (ii) The lanthanoid ions $$ Lu^{3+}, Yb^{2+} and \ Ce^{4+} $$ are diamagnetic . Which of the statement (s) given above is/are correct?

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