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How many d'electrons are present in Cr^(...

How many d'electrons are present in `Cr^(2+)` ion?

A

4

B

5

C

6

D

3

Text Solution

Verified by Experts

The correct Answer is:
A
`Cr(Z=24) rarr 3d^5 4s^1` thus `Cr^(2+) rarr 3d^4` i.e No. of d-electrons = 4
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MTG GUIDE-THE d-AND f- BLOCK ELEMENTS-NEET CAFE (TOPICWISE PRACTICE QUESTIONS)
  1. Which of the following is a carbonate ore?

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  2. Which one of the following shows highest magnetic moment?

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  3. How many d'electrons are present in Cr^(2+) ion?

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  4. Which metal is present in brass, bronze and German silver?

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  5. Which of the following configurations is correct for iron ?

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  6. Which of the following does not have valence electrons in 3d-subshell?

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  7. Which of the following types of metals make the most efficient catalys...

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  8. Choose the correct statement for transition element.

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  9. Which of the following contains maximum number of unpaired electrons?

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  10. Which of the following compounds is not coloured?

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  11. Which one of the following ionic species will impart colour to an aque...

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  12. Zinc and mercury do not show variable valency like d-block elements be...

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  13. Which of the following is colourless in water?

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  14. The alloy best suited for making meter scales is

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  15. In the ground state, an element has 13 electrons in its "M shell". The...

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  16. The ionic radii of group-12 metals Zn, Cd and Hg are smaller than thos...

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  17. A non-copper alloy is

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  18. Which one of the following transition metal ions has the lowest densit...

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  19. The last electron in d-block elements goes to

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  20. Mercury sticks to the surface of the glass when it comes in contact wi...

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