Na\(_2\)S\(_2\)O\(_3\)(aq) + 2HCl(aq) → 2NaCl(aq) + H\(_2\)O(l) Which of the following would introduce the greatest...

JAMB 2007

Na\(_2\)S\(_2\)O\(_3\)(aq) + 2HCl(aq) → 2NaCl(aq) + H\(_2\)O(l)
Which of the following would introduce the greatest increase in the rate of the chemical reaction above?

A. An increase in temperature and decrease in the concentration of the reactant
B. A decrease in the volume and increase in the pressure of the reactant
C. A decrease in the temperature and an incease in the concentration of the reactant
D. An increase in temperature and an increase in the concentration of the reactant

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Correct Answer: Option C

Explanation

Generally speaking, all neutralization reactions are considered exothermic, meaning they release heat during the reaction; this is because the formation of water molecules from the hydrogen ions of an acid and hydroxide ions of a base is a highly stable bond formation, releasing energy in the process.

In every exothermic reaction, a decrease in temperature will favour the forward reaction,likewise increasing the concentration of the reactant. Option C

There is an explanation video available below.

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