In which acid would be the concentration in rate of reaction be faster at the start?

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Sulfuric acid

Explanation: -

The chemical formula of Sulfuric Acid = H₂SO₄

The chemical formula of hydrochloric acid = HCl

In both the cases the concentration of the acid is same.

However from the chemical formula of sulfuric acid we can see that it is a dibasic acid.

So for every mole of sulfuric acid 2 mol of H⁺ would be present.

The above experiment is a type of simple displacement reaction. Thus Mg displaces H⁺ from H₂SO₄ in the above experiment.

Thus if more H⁺ is present, more of Mg reacts in the same amount of time.

Hence the reaction would be faster in sulfuric acid at the start.

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.