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(D) Boron can be obtained by: $(i)$ Thermal decomposition of diborane $(B_2H_6)$. $(ii)$ Pyrolysis of boron triiodide $(BI_3)$ using the Van Arkel met

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electrolysis of fused $BCl_3$

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(D) Boron can be obtained by: $(i)$ Thermal decomposition of diborane $(B_2H_6)$. $(ii)$ Pyrolysis of boron triiodide $(BI_3)$ using the Van Arkel method. $(iii)$ Reduction of boron trichloride $(BCl_3)$ with hydrogen $(H_2)$. However,it cannot be obtained by the electrolysis of fused boron trichloride $(BCl_3)$. This is because electrometallurgy is typically used for the extraction of highly electropositive metals such as sodium,potassium,magnesium,calcium,and aluminium,whereas boron is a non-metal/metalloid.

Boron can be obtained by various methods but not by :

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