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  1. The molecular weight of a gas is 45. Its density at STP is
  2. The de-Broglie wavelength associated with a ball of mass 1kg having kinetic energy
  3. Considering entropy (S) as a thermodynamic parameter, the criterion
  4. The ionic radii of isoelectronic species N³⁻, O²⁻ and F⁻ are in the order
  5. Excess of Na⁺ ions in air system causes