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The stable bivalency of Pb and trivalenc...

The stable bivalency of Pb and trivalency of Bi is-

A

due to d contraction in Pb and Bi

B

due to relativistic contraction of the 6s-orbitals of Pb and Bi, leading to inert pair effect.

C

Due to screening effect

D

due to attainment of noble gas configuration

Text Solution

Verified by Experts

The correct Answer is:
B
Due to relativistic contraction of 6s-orbital, inert pair effect is observed as a result of which, the lowest oxidation states of elements attain stability on moving down a group in the periodic table. Thus leas shows stable bivalency while bismuth shows stable trivalency.
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CHHAYA PUBLICATION-CLASSIFICATION OF ELEMENTS & PERIODICITY IN PROPERTIES-ENTRANCE QUESTION BANK
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  2. It the 1st ionisation energy of H atom is 13.6 eV, then the 2nd ionisa...

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  3. The stable bivalency of Pb and trivalency of Bi is-

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  4. Which of the following is correct?

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  5. For BC l(3), AlCl(3) and GaCl(3), the following order of ionic charact...

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  6. The hydrides of the first elements in group 15-17, namely NH(3),H(2)O ...

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  7. Decreasing basic character of K(2)O, BaO, CaO, MgO is

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  8. Amongst Be, B, Mg and Al the second ionisation potential is maximum fo...

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  9. An element X belongs to fourth period and fifteenth group of the perio...

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  10. Which of the following atoms should have the highest 1st electron affi...

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  11. Which of the follwing order is wrong?

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  12. Which of the following orders presents correct sequence of the increas...

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  13. The increasing order of the ionic radii of the given isoelectronic spe...

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  14. The first ionisation potential of Na is 5.1 eV. The value of electron ...

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  15. Which of the given represents correct order of incrasing first ionisat...

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  16. Which one has the highest boiling point-

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  17. Ionic radii (Å) of N^(3-),O^(2-) and F^(-) are -

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  18. Which of the following atoms ha the highest first ionisation energy-

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  19. The group having isoelectronic species is-

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