A Certain Salt (X) Gives The Following Tests:   (i) Its Aqueous Solution Is Alkaline To Litmus. (ii) On Strongly Heating It Swells To Give A Glassy Bead (iii) When Concentrated Sulphuric Acid Is Added To A Hot Concentrated Solution Of (X), Crystals Of H3BO3 separate Out. Identify The Colour Of These Crystals. 

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