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The correct order of ionic radii of Y^(3...

The correct order of ionic radii of `Y^(3+), La^(3+), Eu^(3+)` and `Lu^(3+)` is (At.no. Y=39, La=57, Eu=63, Lu=71)

A

` Y^(3+)gtLa^(3+)gt Eu^(3+) gt Lu^(3+)`

B

`Y^(3+)gtLu^(3+)gt Eu^(3+) gt La^(3+)`

C

`Lu^(3+)gt Eu^(3+) gt La^(3+)gtY^(3+)`

D

`La^(3+)gt Eu^(3+) gt Lu^(3+)gtY^(3+)`

Text Solution

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The correct Answer is:
B
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AAKASH INSTITUTE ENGLISH- ALCOHOLS, PHENOLS AND ETHERS-Assignment Section -D (Assertion - reason type question)
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  5. A : In esterification reaction , HCOOH is the most reactive acid among...

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  6. A : Ethers can't be distilled upto dryness due to fear of explosion . ...

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  8. A : CH(3) - underset(O)underset(||)(C)-COOH gives haloform reaction ...

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  10. A : Grignard's reagent is prepared in the presence of ether . R :...

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  11. A : CH(3) - underset(CH(3))underset(|)overset(CH(3))overset(|)(C)-CH=...

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  12. A : Two moles of Grignard reagent is consumed in the formation of ter...

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  13. A : bond angle in ether is slightly greater than normal tetrahedral an...

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  14. A : CH(3)-underset(CH(3))underset(|)overset(CH(3))overset(|)(C)-O-CH...

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  15. A : Ortho - cresol is weaker acidic than meta-cresol . R : It is d...

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  16. A : Among all ortho halophenol , fluorophenol is least acidic . R ...

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  17. A : In esterification reaction alcohol act as nucleophile . R : ...

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  18. A : Phenol is manufactured by Dow 's pocess. R : It involves the ...

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  19. A : Primary alcohol is prepared by the reaction of primary amine with ...

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  20. A : The reactivity order of alcohols is 1^(@) gt 2^(@) gt 3^(@) for ...

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