Question

Funnel arrangement is used to prepare $HCl$ gas to avoid:
A. Overflow
B. Mixing
C. Back suction
D. fumes

Answer 1

Hint:The hydrochloric acid can be prepared by using the gaseous form of the acid and mixing it with water in order to gain an aqueous solution of the acid.
This process is done, till the water becomes saturated with the hydrogen chloride gas and thus forming concentrated hydrochloric acid.

Complete step-by-step answer:In the preparation of the hydrochloric acid, the inverted funnels are being used in the laboratory. In the process the inverted funnel is usually attached to the main source of the hydrochloric gas. The funnel is then kept over the trough which is filled with water and the surface of the water should be touched by the end of that tunnel. Now, the hydrochloric acid gas gets passed through the funnel and then it gets dissolved in the aqueous solution. The solubility rate of the hydrochloric acid gas is comparatively higher than the production of the hydrochloric acid rate and therefore there is the creation of the partial vacuum which is created in the pipe through which the gas was passing and because of the atmospheric pressure the level of the water inside the funnel. When this water goes inside the said funnel, there is a creation of an air gap between the surface of water and that of the funnel. At this specific point the pressure which is present inside of the funnel becomes equal to the pressure which is present outside of the funnel and the water which is inside, falls back. This process continues until the trough becomes completely saturated with the hydrochloric gas which results in the formation of the hydrochloric acid.
The funnel has a significant role as it lessens the back suction of the water and also it helps in increase of the surface area of the water for absorption of the gas.

So, the correct answer would be Back suction which is option C.

Note:The inverted funnels are used in the preparation of the hydrochloric acid as it helps in increasing the surface area for the absorption of the gas and it also helps in lessening of the back suction of water.