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How many compounds given below are corre...

How many compounds given below are correctly matched with their uses?
(i) Borax solution : Buffer
(ii) \(AlCl_{3}\) :" Friedel - Crafts reaction
(iii) \(Al_{2}O_{3}\):Abrasive powder
(iv) \(Al(OH)_{3}\) :High alumina cement
(v) \(B(OH)_{3}\): Manufacture of optical glasses
(vi) \(NaBH_{4}\): Reducing agent

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