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Starting from boric acid how can you pre...

Starting from boric acid how can you prepare boron hydride.

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Boric acid is first converted to boric anhydride which on heating with Mg-powder forms magnesium boride. On reacting dilute HCl with magnesium boride, boron hydrides are formed.
`H_3BO_3 overset(Delta) to B_2O_3 underset("heat")overset(Mg)to Mg_3B_2 underset(HCl)overset(dil.)to B_2H_6, B_5H_9, B_6H_10,...`
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