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Assertion: the 4f^(-) and 5f^(-) inner t...

Assertion: the `4f^(-)` and `5f^(-)` inner transition series of elements are placed separately at the bottom of the modern periodic table.
Reason : (i) Position of f-block elements prevents the undue expansion of the mordern periodic table, ie, maintains its structure.
(ii) Position of f-block elements preserves the principle of classification by keeping elements with similar properties in a single column.

A

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-5

B

Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-5

C

Statement-1 is True, Statement-2 is False

D

Statement-1 is False, Statement-2 is True

Text Solution

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The correct Answer is:
A
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GRB PUBLICATION-PERIODIC TABLE-Reasoning Type
  1. Statement-1: In a period, noble gas has largest atomic radius. State...

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  2. Statement-1: The 5^(th) period of periodic table contains 18 elements ...

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  3. Assertion: the 4f^(-) and 5f^(-) inner transition series of elements a...

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  4. Statement-1: Manganese (atomic number 25) a less favourable electron a...

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  5. Assertion: In general, for an element, IE(1) lt IE(2) lt IE(3).... R...

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  6. Statement-1: Second electron gain enthalpy of halogens is always posit...

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  7. Statement-1: Third ionisation energy of phosphorous is larger than sul...

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  8. Statement-1: First ionisation energy of O^(+)(g) is greater than that ...

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  9. Statement-1: Down the group, electronegativity decreases from B to TI....

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  10. Statement-1: Sc(Z = 21) is placed as d-block element. Statement-2: L...

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  11. Statement-1: Na^(+) and AI^(3+) are isoelectronic but the magnitude of...

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  12. Statement-1: The atomic radii of the elements of the oxygen family are...

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  13. Statement-1: Metallic character of first group metals increases down t...

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  14. Statement-1: Fluorine has a less negative electron gain enthalpy than ...

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  15. Statement-1: Fluorine forms only one oxoacid, HOF, Statement-2: Fluo...

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  16. Statement-1: Li and Mg shows diagonal relationship. Statement-2: Li...

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  17. Statement-1: The decreasing order of acidi character of CO(2),N(2)O(5)...

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  18. Statement-1: Oxidising property of F(2) is greater than Cl(2). State...

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  19. Statement-1: Generally, ionisation enthalpy increases from left to rig...

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  20. Statement-1: Boron has a smaller first ionisation enthalpy than beryll...

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