Which of the following would react most rapidly?
a)powdered zn in 1.0 m hcl at 25°c
b)powdered zn in 2.0 m hcl at 40°c
c)a lump of zn in 2.0 m hcl at 25°c
d)a lump of zn in 1.0 m hcl at 40°c

b)powdered Zn in 2.0 M HCl at 40°C

Explanation:

The rate of reaction increases with increase in temperature, increase in concentration of the reactant and increase in surface area. Powered Zn has a greater surface area than a lump of Zn. Also 40°C is a higher temperature than 25°C. Furthermore, 2 M HCl is a more concentrated acid than 1 M HCl. Considering the above three factors powdered Zn in 2.0 M HCl at 40°C will react the fastest.

pla·gia·rism

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noun

the practice of taking someone else's work or ideas and passing them off as one's own.

explanation: