The borex based test can be used tto detect the presence of

  • Option 1)

    Al^{3+}

  • Option 2)

    Mg^{2+}

  • Option 3)

    Ni^{2+}

  • Option 4)

    Na^{+}

 

Answers (1)

As we learnt in

Borax Bead Test -

B2O3 on heating combines with a number of coloured transition metal oxides Co, Ni, Cr, Cu, Mn, etc. to form correspending metaborates which posses characteristic colour.

- wherein

CoSO_{4}\overset{\Delta }{\rightarrow}CaO+SO_{3}

CoO+B_{2}O_{3}\rightarrow Co\left ( BO_{2} \right )_{2}

Cobalt metaborate (blue)

 

B2Oon heating, reacts with a number of transition metal oxides, Co, Ni, etc. to form metaborates that have a characteristic colour. 

 

 

 

 


Option 1)

Al^{3+}


This answer is incorrect

Option 2)

Mg^{2+}


This answer is incorrect

Option 3)

Ni^{2+}


This answer is correct

Option 4)

Na^{+}


This answer is incorrect

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