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(D) Boron can be obtained by $(I)$ thermal decomposition of diborane,$(II)$ pyrolysis of boron triiodide (van Arkel) method,and $(III)$ reduction of b

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electrolysis of fused $BCl_3$

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(D) Boron can be obtained by $(I)$ thermal decomposition of diborane,$(II)$ pyrolysis of boron triiodide (van Arkel) method,and $(III)$ reduction of boron trichloride with hydrogen. However,it cannot be obtained by the electrolysis of fused boron trichloride. This is because electrometallurgy is used for the extraction of highly electropositive metals such as sodium,potassium,magnesium,calcium,and aluminium,whereas boron is a non-metal.

Boron can be obtained by various methods but not by

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