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  1. A gas mixture contains 50% He and 50% Methane by volume. What is the percent
  2. Which one of the following metals is required as cofactor by all enzymes
  3. The molecular weight of a gas is 45. Its density at STP is
  4. In which cell the free energy of a chemical reaction is directly converted into
  5. Methyl bromide and ethyl bromide are mixed in equal proportion and the mixture