Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: Coloured cations can be identified by borax bead test. Reason: Transparent bead \[(NaBO{{ }_{2}}+{{B}_{2}}O{{ }_{3}})\] forms coloured bead with coloured cation.A) If both Assertion: and Reason: are true and the Reason: is the correct explanation of the Assertion:
B) If both Assertion: and Reason: are true but the Reason: is not the correct explanation of the Assertion:
C) If Assertion: is true but Reason: is false
D) If both Assertion: and Reason: are false
Correct Answer: A
Solution :
Borax, when heated at about 740°C, forms a glassy bead. \[CaC{{l}_{2}}+{{O}_{2}}.\] This glassy bead gives different colour beads with different cations. Hence, it is used to identify cations in qualitative analysis. This test is called borax bead test.
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