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  1. A helium, molecule is two times heavier than a hydrogen molecule at 298 K
  2. If 900 J/g of heat is exchanged at boiling point of water, then what is increase
  3. Least voltage hydrogen halide is
  4. If uncertainty in position and momentum are equal, then uncertainty in velocity
  5. In acidic medium, H₂O₂ changes Cr₂O₇²⁻ to CrO₅ which has two