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11. The p -block Elements
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Q6 of 50 Page 134

Boric acid is an acid because its molecule

Because of the small size of boron atom and presence of only six electrons in its valence shell, B(OH)3 accepts a pair of electrons from OH- ion of H2O, releasing a proton.


The reaction mechanism is:



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4

Which of the following oxides is acidic in nature?

5

The exhibition of the highest co-ordination number depends on the availability of vacant orbitals in the central atom. Which of the following elements is not likely to act as central atom in MF63-?

7

Catenation i.e., linking of similar atoms depends on size and electronic configuration of atoms. The tendency of catenation in Group 14 elements follows the order:

8

Silicon has a strong tendency to form polymers like silicones. The chain length of silicone polymer can be controlled by adding

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11. The p -block Elements
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