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A: There is very less gap between the va...

A: There is very less gap between the value of radii of 4d and 5d elements
R: Size of 5d is more than 4d subshell

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)

C

If Assertion is true statement but Reason is false, then mark (3)

D

If both Assertion and Reason are false statements, then mark (4)

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze the assertion (A) and the reason (R) provided: **Assertion (A):** There is very less gap between the value of radii of 4d and 5d elements. **Reason (R):** Size of 5d is more than 4d subshell. ### Step-by-Step Solution: 1. **Understanding the Assertion (A):** - The assertion states that the atomic radii of 4d and 5d elements have a small difference. This is indeed true. The atomic radii of elements in the 4d and 5d series are relatively close to each other. 2. **Understanding the Reason (R):** - The reason states that the size of the 5d subshell is larger than that of the 4d subshell. This is also true because the principal quantum number (n) for the 5d subshell is 5, while for the 4d subshell it is 4. As the principal quantum number increases, the size of the subshell increases. 3. **Analyzing the Relationship Between A and R:** - While both statements are true, the reason does not correctly explain the assertion. The small difference in atomic radii between 4d and 5d elements is primarily due to the lanthanoid contraction, which results from poor shielding by f-electrons in the lanthanide series. This leads to a higher effective nuclear charge (Z_eff) experienced by the outer electrons, causing a decrease in atomic size. 4. **Conclusion:** - Therefore, both the assertion and the reason are true, but the reason is not the correct explanation for the assertion. The correct conclusion is that the assertion is true, but the reason does not adequately explain why the atomic radii of 4d and 5d elements are similar. ### Final Answer: Both assertion and reason are true, but the reason is not the correct explanation for the assertion.
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AAKASH INSTITUTE ENGLISH- ALCOHOLS, PHENOLS AND ETHERS-Assignment Section -D (Assertion - reason type question)
  1. A: There is very less gap between the value of radii of 4d and 5d elem...

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  2. Assertion : Boiling point of p-nitrophenol is greater than that of o-n...

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  3. A : When C(2) H(5) - O- CH(3) is reacted with one mole of Hl then C(2...

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  4. A : When 3,3-dimethyl butan - 2 - ol is heated in presence of concentr...

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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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  7. Phenol is less acidic than........... .

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

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  9. A : Diphenyl ether is prepared by Williamson synthesis . R : This...

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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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  21. A : The dehydration of ethyl alcohol in presence of Al(2)O(3) at 633 ...

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