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The electropositive first increases from...

The electropositive first increases from B to Al and then decreases from Al to Tl down the group because of

A

non-metallic nature of B

B

discrepancies in atomic size of elements

C

ability of B and Al to form `p pi - p pi` multiple bonds

D

irregular trend in electronegativity throughout the periodic table.

Text Solution

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The correct Answer is:
B
There is a large size difference between B and AI.
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NCERT FINGERTIPS-THE P-BLOCK ELEMENTS-Group 13 Elements - The Boron Family
  1. How would you explain the lower atomic radii of Ga as compared to Al?

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  2. The first ionisation potential of Al is smaller than that of Mg becaus...

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  3. The electropositive first increases from B to Al and then decreases fr...

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  4. Group 13 elements show

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  5. Aluminium exhibits +3 oxidation state. As we move down the group, +1 o...

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  6. Group 13 elements show +1 and +3 oxidation states. Relative statibilit...

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  7. Which of the following group 13 elements does not show the inert pair ...

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  8. Which has the maximum electropositive character ?

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  9. Describe the shapes of BF(3) and BH(4)^(-). Assign the hybridisation o...

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  10. Halides of boron and aluminium are Lewis Acids. Assign reason.

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  11. Which of the following is not true regarding the nature of halides of ...

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  12. Which of the following hydroxide is acidic?

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  13. The decreasing order of power of boron halides to act as Lewis acids i...

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  14. The aqueous solution of AICI(3) is acidic due to

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  15. The aqueous solution of AICI(3) is acidic due to

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  16. Anhydrous aluminium chloride is prepared by

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  17. The reduction of an oxide by aluminium is called

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  18. Why does AlCl(3) fumes in air?

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  19. Which of the following does not show similarity between boron and alum...

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  20. A metal X reacts with aqueous NaOH solution to form Y and a highly inf...

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