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Borax bead test is given by...

Borax bead test is given by

A

divalent metals

B

heavy metals

C

light metals

D

metal which forms coloured metaborates

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### Step-by-Step Solution: 1. **Understanding Borax**: - Borax is a compound with the formula Na2B4O7, which is sodium tetraborate. 2. **Borax Bead Test**: - The borax bead test involves heating borax in the presence of platinum (Pt) wire. The borax melts and forms a glassy bead. 3. **Chemical Reaction**: - When borax is heated with platinum, it undergoes a reaction to form sodium metaborate (NaBO2) and boron trioxide (B2O3): \[ \text{Na}_2\text{B}_4\text{O}_7 + \text{heat} + \text{Pt} \rightarrow \text{NaBO}_2 + \text{B}_2\text{O}_3 \] 4. **Formation of Glass Bead**: - The resultant mixture forms a glass bead. This bead can then be used to identify certain metal ions based on the color produced when the bead is cooled and exposed to flame. 5. **Identification of Cations**: - The borax bead test is particularly useful for identifying metal ions that form colored metaborates. These colored metaborates are indicative of specific metal ions, allowing for their identification. 6. **Conclusion**: - The borax bead test is primarily used for metals that form colored metaborates, which helps in identifying the presence of certain cations.
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Borax Bead Test is carried out when the original mixture is coloured. It is done with the help of a cleam platinum wire on which a small loop is made at the end. When borax is heated on platinum wire loop transparent glass like bead is obtained. The hot bead is brought in contact with salt till it reacts with fused borax and colour is imparted to the bead. bead colour is noted. {:("Colour of the bead","Ion"),(1." Blue green",Cu^(2+)),(2." Yellow ",Fe^(3+)),(3." Green",Cr^(3+)),(4." Violet",Mn^(2+)),(5." Dark blue",Co^(2+)),(6." Brown",Ni^(2+)):} Q. The flame used in Borax Bead Test is:

Borax Bead Test is carried out when the original mixture is coloured. It is done with the help of a cleam platinum wire on which a small loop is made at the end. When borax is heated on platinum wire loop transparent glass like bead is obtained. The hot bead is brought in contact with salt till it reacts with fused borax and colour is imparted to the bead. bead colour is noted. {:("Colour of the bead","Ion"),(1." Blue green",Cu^(2+)),(2." Yellow ",Fe^(3+)),(3." Green",Cr^(3+)),(4." Violet",Mn^(2+)),(5." Dark blue",Co^(2+)),(6." Brown",Ni^(2+)):} Q. Glassy bead of :