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The electropositive character increases ...

The electropositive character increases from B to Al and then decreases from Al to Tl because of 

A

Increase in the size of the elements

B

Decrease in the ionization energy of the elements

C

Decrease in the electronegastivity of the elements

D

Ineffective shielding of the nuclear charge by d-electrons in the case of Ga, In and Tl

Text Solution

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The correct Answer is:
D
Due to ineffective shielding of the nuclear charge by d -electrons in the case of Ga, In and Tl.
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AAKASH SERIES-ELEMENTS OF BORON FAMILY-LECTURE SHEET (EXERCISE - I) LEVEL - II (ADVANCED)
  1. Thallium shows diferent oxidation states because

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  2. Which of the following is used in high temperature thermometry ?

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  3. The electropositive character increases from B to Al and then decrease...

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  4. III A group element with highest density is

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  5. Electronegativity is least for

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  6. The hybridisation of boron in ortho boric acid is

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  7. Boric acid (H(3)BO(3)) has

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  8. Boric acid is polymer due to

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  9. Least basic among the following is

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  10. H(3)BO(3)overset(" Redhot ")rarr X. 'X' in the reaction is

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  11. Which of the following does not exist ?

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  12. The following has a potential to be used as a rocket fuel

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  13. Stability of monovalent and trivalent cations of Ga, In, Tl lie in the...

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  14. When metal carbides react with H(2)O, the correct equations are

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  15. Which of the following statements are true for H(3)BO(3) ?

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  16. Which of the following statements(s) is/are correct regarding the stru...

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  17. Al and Ga have nearly the same covalent radius, incorrect reason is

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  18. Borazine is called 'inorganic benzene' in view of its ring structure w...

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  19. ln which of the following molecules, vacant orbitals cake part in hybr...

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  20. Orthoboric acid (H(3)BO(3)) and metaboric acid (HBO(2)) differ in resp...

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