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Statement-1: The radii of third (5d) ser...

Statement-1: The radii of third (5d) series are vircutally the same as those of the corresoponding members of the second (4d) series.
Statement-2: The filling of 4f orbitals before 5d orbitals results I a regular decrease in atomic radii called lathonoid contraction which essentially compensates for the expected increase in atomic size with increasing atomic number.

A

Statement-1 is true, statement-2 is true, statement-2 is a correct explanation for statement-1.

B

Statement-1 is true, statement-2 is true, statement-2 is NOT a correct explanation for statement-1

C

Statement-1 is true, statement-2 is false.

D

statement-1 is false, statement-2 is true.

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The correct Answer is:
A
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Assertion : In transition elements radii of 5d series are virtually the same as those of the corresponding members of 4d series. Reason : The filling of 4f orbitals before 5d orbitals results in regular decrease in atomic radii.

The atomic radii of the metals of the third (5d) series of transitions elements are virtually the same as those of the corresponding members of the second (4d) series. Explain.

Read the passage given below and answer the following questions: In transition elements, generally, ions of the same charge in a given series show progressive decrease in radius with increasing atomic number. This is because the new electron enters a d orbital each time the nuclear charge increases by unity. But the radii of the third (5d) series are virtually the same as those of the corresponding members of the second series. This phenomenon is associated with the intervention of the 4f orbitals which must be filled before the 5d series of elements begin. The filling of 4f before 5d orbital results in a regular decrease in atomic radii called Lanthanoid contraction. Following are the transition metal ions of 3d series: Ti^(4+), v^(2+), Mn^(3+), Cr^(3+) (Atomic number: Ti = 22, V = 23, Mn = 25, Cr = 24) Assertion (A): Ti^(4+) ion is colourless. Reason (R): All valence electrons are unpaired in Ti^(4+) ion.

Read the passage given below and answer the following questions: In transition elements, generally, ions of the same charge in a given series show progressive decrease in radius with increasing atomic number. This is because the new electron enters a d orbital each time the nuclear charge increases by unity. But the radii of the third (50) series are virtually the same as those of the corresponding members of the second series. This phenomenon is associated with the intervention of the 4f orbitals which must be filled before the 5d series of elements begin. The filling of 4f before 5d orbital results in a regular decrease in atomic radii called Lanthanoid contraction. Following are the transition metal ions of 3d series: Ti^(4+), V^(2+), Mn^(3+), Cr^(3+) (Atomic number: Ti = 22, V = 23, Mn = 25, Cr = 24) Assertion (A): Among the given ions, Mn^(3+) is the most strong oxidizing agent. Reason (R): Mn^(3+) has an unstable configuration.

GRB PUBLICATION-D-BLOCK ELEMENTS-Subjective Type
  1. Statement-1: The radii of third (5d) series are vircutally the same as...

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  2. Number of halide ions among (F^(-),Cl^(-),Br^(-),I^(-)) which change t...

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  3. Select the number of correct matches for the outermost electronic conf...

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  4. Find the number of species among the following which can exist. TiO(...

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  5. Find the number of halides which do not exist. TiI(4),TiI(3),TiI(2),...

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  6. The number of halides that do not exist among the following: CuF(2),...

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  7. Find the number of mixed oxides among the following: Mn(3)O(4),Fe(3)...

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  8. Given the species Mn^(3+),Co^(3+),Ti^(2+),V^(2+),Cr^(2+),Fe^(2+) (a)...

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  9. Find the number of colourless species among the following: Sc^(3+),T...

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  10. Which of the following is amphoteric oxide? Mn(2)O(7),CrO(3),Cr(2)O(...

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  11. Predict the number of species which will be colourless in aqueous solu...

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  12. When mixture of NaCl and K(2)Cr(2)O(7) is gently warmed with conc. H(2...

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  13. Number of ions which given blue colour in aqueous state: V^(+4),Ni^(...

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  14. Define the oxidation states of Mn in product of the given reaction 3...

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  15. Find the number of metal ions which can produce high spin and low spin...

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  16. How many non-axial d-orbitals are involved in hybridisation of CrO(2)C...

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  17. Find the number of species from the following which has magnetic momen...

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  18. Total number of moles of Mohr's salt required per mole of dichromate i...

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  19. Find the number of reaction (s) in which no redox change takes place: ...

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