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The electropositive character increases ...

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

A

Increase in the size of the elements

B

Decrease in the ionization energy of the elements

C

Decrease in the electronegativity of the elements

D

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

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The correct Answer is:
D
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AAKASH SERIES-ELEMENTS OF BORON FAMILY-OBJECTIVE EXERCISE -1 (General introduction and properties)
  1. +1 oxidation state is stable for the element

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  2. The element that exhibits negative oxidation state in IIIA group is

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  3. Among the III A group elements, the difference in the atomic radius is...

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  4. Aluminium exhibits diagonal relationship with

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  5. Which element cannot form a cation ?

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  6. Electronic structure acquired by compounds of IIIA group elements in b...

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  7. The nature of B2 O3 is

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  8. Thallous chloride is more stable than thallic chloride because of

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  9. Which of the following pair of elements have same atomic radius

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  10. Thallium shows different oxidation states because

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  11. Which of the following is used in high temperature thermomertry?

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  12. (A) : Among IIIA group elements, Boron has highest melting point (R...

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  13. Which one is a non-metal in group 13 ?

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

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  15. When boron atom undergoes sp^3 hybridization

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  16. Boron exhibits diagonal relationship with

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  17. (A): TICl3 acts as a good oxidant (R): T2^(+3) is less stable than T...

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  18. Which one of the following elements does not form triiodide on reactin...

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  19. Osmotic pressure of the solution can be increased by

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  20. Which one of the following forms a basic oxide?

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