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Lanthanide elements are called as rare e...

Lanthanide elements are called as rare earth because

A

their oxides are difficult to decompose

B

the elements are rarely found in the earth crust

C

they were few in nature

D

they element were very light

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The correct Answer is:
B
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NIKITA PUBLICATION-D-AND F-BLOCK ELEMENTS-MULTIPLE CHOICE QUESTIONS
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  2. Which of the following is transuranium element ?

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  3. Lanthanide elements are called as rare earth because

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  4. The transuranic elements are prepared by

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  5. Which element is not naturally occuring ?

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  6. Which of the following, is prepared artificially?

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  7. The lanthanide have general electronic configuration

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  8. The outer electronic coonfiguration of cerium is

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  9. Match list I and II and select the correct answer using the code given...

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  10. Which of the following elements shows 6s^(2) , 4f^(7) 5d^(1) electroni...

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  11. Lutetium has electronic configuration

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  12. Gadolinium contain one electron in 5d-orbital due to

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  13. In which of the following elements one electron is present in 5d orbit...

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  14. Which of the following is expected electronic configuration of europiu...

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  15. The expected electronic configuration of cerium is

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  16. How many unpaired electrons present in 4f-orbital of lutetium ?

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  17. As atomic number increases from 57 to 71 in tripositive lanthanon, the...

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  18. The electronic configuration of gaedolinium.

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  19. Which of the following has 4f^(7) configuration

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  20. How many total number of unparied electrons in Gd are

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