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  1. The oxidation numbers of hydrogen in KH,MgH₂ and NaH are respectively
  2. The amphoteric oxide is
  3. For an endothermic reaction, energy of activation is Ea and enthalpy of reaction
  4. The long form of periodic table is based on
  5. Boron has two stable isotopes, ¹°B(19%) and ¹¹B(81%). Average atomic weight