Which of the following buffer systems would yield a pH of around 2? H2S04 and NaHSO4
B
H3PO4 and NaH2P04
C
HF and NaF
HC2H302 and NaC2H302
ما
E
NH3 and NHAOH

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.