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(A) : Mg^(2+) and Al^(3+) are isolectron...

(A) : `Mg^(2+)` and `Al^(3+)` are isolectronic but the magnitude of ionic radius of `Al^(3+)` is less than that in `Mg^(2+)`.
(R ) : The effective nuclear charge on the outermost electrons in `Al^(3+)` is greater than that in `Mg^(2+)`.

A

Both A and R are correct. R is the correct explanation of A.

B

Both A and R are correct, R is not the correct explanation of A.

C

A is true and R is false

D

A is false , but R true

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-PERIODIC CLASSIFICATION-OBJECTIVE EXERCISE - 1 (ATOMIC AND IONIC RADIUS)
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  2. The correct order of Vander Waals radius of F, Cl and Br is :

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  3. The correct arrangenment of O, P and N in order of increasing radii is

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  4. Atomic radius is measured by

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  5. Atomic radius depends upon (i) Number of bonds formed by the atom ...

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  6. Covalent bond length of chlorine molecule is 1.98Å. Then covalent radi...

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  7. Van der waal's radius is measured for

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  8. If the atomic radius of non-metal bromine is 1.14 Å, its covalent radi...

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  10. In the isoelectronic species the ionic radii (A^@) of N^(3-) , O^(2-) ...

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  11. Correct statement among the following is

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  12. Very slight decrease in atomic radius occurs in a transition series wh...

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  13. Separation of Lanthanides from their mixture is not easy because of

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  14. If the radius of Fe^(+ +) is 0.76A^@, the radius of Fe^(+ + +) may be

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  15. Among elements with the following electronic configurations, the one w...

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  16. Largest ion among the following is

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  17. Which of the following has the largest atomic radius ?

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  18. Which of the following order is correct for the size of Fe^(3+) , Fe a...

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  19. Similarity in the radius of Zr and Hf is explained on the basis of

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  20. Metallic radius of Ca is 200pm. Covalent radius of Ca is

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