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The salt which does not form coloured metaborate in borax bead test.

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The salt which does not form coloured metaborate in borax bead test.
A. `Fe_(2)(SO_(4))_(3)`
B. `Al_(2)(SO_(4))_(3)`
C. `Cr_(2)(SO_(4))_(3)`
D. `CoSO_(4)`
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Correct Answer - A
`(r_(x_(3)))/(r_(CH_(4)))=sqrt((M_(CH_(4)))/(M_(x_(3))))`
`(4//3)/(1)=sqrt((16)/(M_(x_(3))))" "M_(x_(3))=9`
Atomic mass x = 3
`V.D.=(9)/(2)=4.5" "d=(MP)/(RT)`
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