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(A) : Borax bead test is not suitable for Al(III)
(R) : ${Al}_{2} O_{3}$ is insoluble in water

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A is true, but R is false

A and R are true, R does not explain A

A and R are true, R explains A

A is false, but R is true

answer is B.

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Detailed Solution

Al³⁺ do not give borax bead test due to Al³⁺ do not give meta borates and it is colourless .
Alumina is insoluble in water as they exist in hydrated form like ${Al}_{2} O_{3} . 2 H_{2} O, {Al}_{2} O_{3} . H_{2} O, etc .$

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