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Ийм бүрхүүлүүд үүссэнээр хөнгөн цагаанаар хийгдсэн эдлэлүүд агаарт, мөн усанд маш тогтвортой байна. Хэрэв гадаргуугийн ислэн бүрхүүлийг авах юм бол хөнгөн цагаан устай харилцан үйлчлэлцэж устөрөгчийг ялгаруулна. 2Al+6H 2 O→2Al (OH) 3 +3H 2 Хүйтэнд HNO 3, H 2 SO 4 -н концентрацитай хүчлүүдэд Al 2 O 3 бүрхүүл үүссэнээр идэвхгүй болно.
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