MHT CET · Chemistry · d and f Block Elements
Which from following properties of lanthanoids is NOT true?
- A These are bad conductors of heat and electricity.
- B These are soft metals.
- C Coordination number is usually greater than six.
- D These are strongly paramagnetic.
Answer & Solution
Correct Answer
(A) These are bad conductors of heat and electricity.
Step-by-step Solution
Detailed explanation
(1) These are bad conductors of heat and electricity:
- This is incorrect. Lanthanoids are generally good conductors of heat and electricity, although they are not as good as transition metals.
(2) These are soft metals:
- This is true. Lanthanoids are relatively soft metals, especially the earlier ones in the series.
(3) Coordination number is usually greater than six:
- This is true. Lanthanoids, because of their large ionic radii, often have a coordination number greater than six, especially in complexes.
(4) These are strongly paramagnetic:
- This is true. Lanthanoids have unpaired f-electrons, making them paramagnetic. Some of them (especially those with a larger number of unpaired f-electrons) are strongly paramagnetic.
- This is incorrect. Lanthanoids are generally good conductors of heat and electricity, although they are not as good as transition metals.
(2) These are soft metals:
- This is true. Lanthanoids are relatively soft metals, especially the earlier ones in the series.
(3) Coordination number is usually greater than six:
- This is true. Lanthanoids, because of their large ionic radii, often have a coordination number greater than six, especially in complexes.
(4) These are strongly paramagnetic:
- This is true. Lanthanoids have unpaired f-electrons, making them paramagnetic. Some of them (especially those with a larger number of unpaired f-electrons) are strongly paramagnetic.
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