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State what happens when B2O3 and Mg powd...

State what happens when `B_2O_3` and Mg powder are fused together and the product is boiled with dilute HCl.

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On fusing `B_2O_3` and Mg power a mixture of `Mgo` and Boron is obtained which on being boiled with dil.HCl soluble `MgCl_2` is produced with the precipitation of boron.
`B_2O_3Mgoverset("fuse")rarr3MgO+2B`
`MgO+2HCl=MgCl_2+H_2O`
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