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Which of the following will react the fastest with 
25cm^(3) of 
0.1moldm^(-3) 
HCl at room temperature?

13g of 
Mg powder

23g of 
Mg strip

33g of 
Mg granules
1
2
3
Clear selection

Which of the following will react the fastest with 25 cm3 25 \mathrm{~cm}^{3} of 0.1moldm3 0.1 \mathrm{moldm}^{-3} HCl \mathrm{HCl} at room temperature?\newline13 g 13 \mathrm{~g} of Mg \mathrm{Mg} powder\newline23 g 23 \mathrm{~g} of Mg \mathrm{Mg} strip\newline33 g 33 \mathrm{~g} of Mg \mathrm{Mg} granules\newline11\newline22\newline33\newlineClear selection

Full solution

Q. Which of the following will react the fastest with 25 cm3 25 \mathrm{~cm}^{3} of 0.1moldm3 0.1 \mathrm{moldm}^{-3} HCl \mathrm{HCl} at room temperature?\newline13 g 13 \mathrm{~g} of Mg \mathrm{Mg} powder\newline23 g 23 \mathrm{~g} of Mg \mathrm{Mg} strip\newline33 g 33 \mathrm{~g} of Mg \mathrm{Mg} granules\newline11\newline22\newline33\newlineClear selection
  1. Rate of Reaction Dependence: We know that the rate of reaction depends on the surface area of the reactants; the greater the surface area, the faster the reaction.
  2. Surface Area Comparison: Mg powder has the highest surface area compared to Mg strip and Mg granules because the particles are smaller.
  3. Fastest Reacting Substance: So, Mg\text{Mg} powder will react the fastest with the HCl\text{HCl} solution.

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