Question

Borax-bead test is responded by
A) Divalent metals
B) Heavy metals
C) Light metals
D) Metals which form coloured metaborates.

Answer 1

We must have to remember that in the inorganic chemical having two kinds of analysis one is qualitative and quantitative analysis. Qualitative analysis means detecting which metal is present in a sample. The quantitative analysis means to calculate the weight of each metal present in the sample.

Complete step by step answer:
We have to remember that the Borax-bead test is one of the inorganic analysis tests. It is used for qualitative analysis. In this test metal oxide heated with glossy beads to form respect metal metaborates. This reaction is some colour change observed from metal oxide of one metal to metal metaborates, metabolites from another colour.
We must know that the Borax-bead test does not give better results for divalent metals, because no characteristic change observed in this test. Hence, Borax-bead is not responsible for divalent metals.
Therefore, the option A is not correct.
We need to know that the Borax-bead test does not give better results for heavy metals, because no heavy metals are not react with beads and no characteristic change is observed in this test. Hence, Borax-bead is not responsible for heavy metals.
Therefore, the option B is not correct.
Borax-bead test does not give better results for light metals, because light metals are less dense it immediately breaks down when it reacts with beads. Hence, Borax-bead is not able to find light metals.
Option C is not correct.
We need to know that the Borax-bead test is possible or not only to find out colour change. This colour change observed only those metals giving different colour from metal oxide to metaborates. In some metal both metal oxide and metal metaborates give the same colour, this kind of metal is not applicable for borax-bead test.
Therefore, Borax-bead test is responded to by metal which form coloured metaborates.
Therefore, option D is correct.

Note:
We must remember that in borax-bead test metal oxide forms corresponding metabolites by heating with beads. These colours of metaborates are used to find that metal in our sample. This is the one of the important tests to identify qualitative inorganic analysis. This test is very useful to find copper, nickel like metal to give different colour in metal oxide and metal metaborates.