Assertion : Borax bead test is not suitable f | vedclass

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Question

(B) The borax bead test is used to identify transition metal ions by the formation of characteristic coloured metaborates. $Al^{3+}$ ions do not form

Vedclass · Accepted Answer

If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

Vedclass · Answer

(B) The borax bead test is used to identify transition metal ions by the formation of characteristic coloured metaborates. $Al^{3+}$ ions do not form coloured metaborates,which is why the test is not suitable for $Al(III)$.$Al_2O_3$ is indeed insoluble in water,but this property is unrelated to the failure of the borax bead test for aluminium. Therefore,both statements are correct,but the reason does not explain the assertion.

column-$I$ $(\text{Property})$	column-$II$ $(\text{Metal})$
$i$. An element which can show $+8$ oxidation state	$a$. $Mn$
$ii$. $3d$ series element that can show upto $+7$ oxidation state	$b$. $Cr$
$iii$. $3d$ series element with highest melting point	$c$. $Os$

Assertion : Borax bead test is not suitable for $Al(III)$.
Reason : $Al_2O_3$ is insoluble in water.

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Assertion : Borax bead test is not suitable for $Al(III)$.Reason : $Al_2O_3$ is insoluble in water.