1.

A glassy bead formed by heating borax on a platinum wire loop is

Answer»

sodium tetraborate
sodium metaborate
sodium metabarate and BORIC anhydride
sodium tetraborate and boric anhydride

Solution :`Na_(2)B_4O_(7).10H_(2)O overset("Heat")rarrNa_(2)B_(4)O_(7)+10H_2O`
`Na_(2)B_(4)O_(7) rarr ubrace(2NaBO_2 + B_2O_3)_("Glassy bead")`


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