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The maximum covalency of aluminium is '6...

The maximum covalency of aluminium is '6' where as that of boron is '4' because 

A

Aluminium is more electropositive than boron

B

'Al' can form a cation where as boron can not

C

'Al' contains vacant l'orbitals in its valence shell where as boron does not

D

'Al' is a metal where as boron is a non metal

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The correct Answer is:
C
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AAKASH SERIES-ELEMENTS OF BORON FAMILY-OBJECTIVE EXERCISE - 2
  1. Among the following most electropositive element is

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  2. Al and Ga have nearly the same covalent radii, because of

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  3. The maximum covalency of aluminium is '6' where as that of boron is '4...

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  4. Which one of the following has the lowest melting point

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  5. H(3)BO(3)overset("Red heat")rarrX.X in the reaction is

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  6. The element of IIIA group with least density

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  7. The statements regarding 'B' and Al are I) Boron is a bad conductor ...

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  8. The correct order of melting points of IIIA group elements is

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  9. The IIIA group clement that does not displace hydrogen from hydrochlor...

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  10. 2X+6LiHoverset(450K)rarr B(2)H(6)+Y. The compounds, X and Y are

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

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  12. The correct order of ionization potential [IP(1)] among the IIA group ...

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  13. (A) : Increase in the atomic radius from B to Al is more than that of ...

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  14. Which of the following does not undergo hydrolysis?

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  15. The product formed in the reaction BCl(3)+H(2)Orarr

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  16. The correct increasing order of the stability of Al, Ga^(+), In^(+), T...

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  17. In the electrolysis of alumina using cryolite, the reaction that takes...

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  18. Hydrogen gas is liberated when aluminium is treated with A) Air B)...

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  19. Which of the following is weakest Lewis acid ?

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  20. Aluminium reacts with concentrated H(2)SO(4) to liberate SO(2) gas. In...

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