Which of the following will not give a borax | vedclass

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(C) The borax bead test is used to identify transition metal ions in a sample. When borax $(Na_2B_4O_7 \cdot 10H_2O)$ is heated,it forms a transparent

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$Na$

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(C) The borax bead test is used to identify transition metal ions in a sample. When borax $(Na_2B_4O_7 \cdot 10H_2O)$ is heated,it forms a transparent glassy bead consisting of sodium metaborate $(NaBO_2)$ and boric anhydride $(B_2O_3)$. Transition metals react with this bead to form colored metaborates. Since $Na$ is an alkali metal and not a transition metal,it does not form colored metaborates and thus does not give a positive borax bead test. $Cr$,$Ni$,and $Mn$ are transition metals and will give characteristic colors in the borax bead test.

Which of the following will not give a borax bead test?

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