The experimental apparatus represented above is used to demonstrate the rates at which gases diffuse. When the cotton balls are placed in the ends of a tube at the same time, the gases diffuse from each end and meet somewhere in between, where they react to form a white solid. Which of the following combinations will produce a solid closest to the center of the tube?
(A) HCl and CH, NH
(B) HCI and NHs
(C) HBr and CHNH,
(D) HBr and NH
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