the properties of a gas occupying a bulb connected to a U-tube manometer?

Question

A chemist is studying the properties of a gas occupying a bulb connected to a U-tube manometer, the other end of which is open to the air. The gas in the bulb is in contact with a solid chemical, with which it may be reacting. The observation is made that the level of the mercury in the U-tube on the side of the bulb is gradually falling over time. Which of the following cannot be a potential cause for this?

A. The temperature of the gas inside the bulb is increasing.
B. A reaction is occurring inside the bulb that is increasing the number of moles of gas.
C. The prevailing atmospheric pressure is falling.
D. The gas is reacting with the solid to produce one mole of product gas for every mole of reactant gas consumed. However, the product gas has a higher molar mass.
E. The solid is subliming (evaporating).

Answer 1

Hi. D.