Class IX

Dalton’s Law of Partial Pressures states that the total pressure exerted by the mixture of non-reactive gases is equal to the
  1. sum of the partial pressures of individual gases
  2. average of the partial pressures of individual gases
  3. difference of the partial pressures of individual gases
  4. maximum of the partial pressures of individual gases
A scale model of a blimp rises when it is filled with 55.0 dm3. When 1.10 mol of He is added to the blimp, the volume is 26.2 dm3. How many more grams of He must be added to make it rise? Assume constant T and P.
  1. 3.98 g He
  2. 4.26 g He
  3. 5.21 g He
  4. 4.84 g He
Calculate the temperature of 4.0 mol of a gas occupying 5 dm3at 3.32 bar. (R = 0.083 bar dm3K−1mol−1).
  1. 310 K
  2. 70 K
  3. 50 K
  4. 150 K
The van der Waals Equation adjusts the measured volume
  1. up by subtracting a factor from the entire container volume that accounts for the container volume
  2. up by subtracting a factor from the entire container volume that accounts for the molecular volume
  3. down by subtracting a factor from the entire container volume that accounts for the molecular volume
  4. down by adding a factor from the entire container volume that accounts for the molecular volume
A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason for this observation is that at high altitude:
  1. pressure decreases
  2. temperature increases
  3. temperature decreases
  4. pressure increases
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