The salt used for performing the 'bead' test | vedclass

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(C) The salt used for the bead test is known as Microcosmic salt,which is $Na(NH_4)HPO_4 \cdot 4H_2O$. Upon heating,it decomposes to form a transparen

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$Na(NH_4)HPO_4 \cdot 4H_2O$

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(C) The salt used for the bead test is known as Microcosmic salt,which is $Na(NH_4)HPO_4 \cdot 4H_2O$. Upon heating,it decomposes to form a transparent bead of sodium metaphosphate: $Na(NH_4)HPO_4 \cdot 4H_2O \xrightarrow{\Delta} NaPO_3 + NH_3 + 5H_2O$. This $NaPO_3$ bead reacts with metal oxides to form colored beads,which helps in the identification of metal ions.

The salt used for performing the 'bead' test in qualitative inorganic analysis is

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