If you need to translate, the answer is
Chemical agents concept
Answer:
Reaction type: Single displacement
Reactant: Magnesium
Product: Dihydrogen - H2
<span>There's a trend in electronegativity. The bottom left of periodic table is the lowest (0.7) and the upper right is the highest (4.0). The most polar is the greatest difference in electronegavity.
hbr- 1~ , hi- 0.5~ ,hcl - 1.3~ , hf-1.8 so,hf is the answer</span>