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  1. Boron has two stable isotopes, ¹°B(19%) and ¹¹B(81%). Average atomic weight
  2. If in a container no mass and no heat exchange occurs then it constitutes a
  3. According to Dalton’s atomic theory the smallest partical of the matter is called
  4. Which of the following species has plane triangular shape
  5. 5 g of hydrogen peroxide is present in 56 mL of solution. The solution