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The D-And-f-Block Elements

Question

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Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements in incorrect

The ionic sizes of Ln (III) decrease in general with increasing atomic number.

Ln (III) compounds are generally colourless.

Because of the large size of the Ln (III) ions, the bonding in its compounds is predominantly ionic in character

Ln (III) hydroxides are mainly basic in character.

Solution

B.

Ln (III) compounds are generally colourless.

Most of the Ln(III) compounds are coloured due to f – f transition.

Some More Questions From The d-And-f-Block Elements Chapter

Silver atom has a completely filled d orbitals (4d¹⁰) in its ground state. How can you say that it is a transition element?

In the series Sc (Z = 21) to Zn(Z = 30), the enthalpy of atomisation of zinc is the lowest i.e., 26, kJ mol. Why?

The E° (M²⁺/M) value for copper is positive (+ 0.34 V). What is possibility the reason for this?

How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements?

Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?

Which is a stronger reducing agent Cr²⁺ or Fe²⁺ and why?

Explain why Cu⁺ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

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