Question

The rate of reaction for a concentrated strong acid with a concentrated strong base is least affected by which of the following?

• A. The use of a catalyst.
• B. A change in temperature.
• C. A change in reactant concentration.
• D. A change in pressure.

Answer 1

Answer: (A)

The use of a catalyst.

A change in pressure effects only if there is a difference between the number of moles of gaseous products & the number of moles of gaseous reactant. In short, a change in pressure affects only if there is at least one gas either in products or reactants.
Reaction could be such as:

$HCl\left(aq\right)+NaOH\left(aq\right)\to NaCl\left(aq\right)+H_{2}O\left(l\right)$

As the reaction between concentrated acid and a base reactant or product takes place, there is least effect of change in pressure on the rate of reaction.

Hence, the correct option is D.