Question

When a piece of zinc metal is added to a solution of hydrochloric acid, a reaction occurs. The products are aqueous zinc chloride and hydrogen gas.
Which of the following conditions would result in the fastest rate of reaction with $1.00g$ of zinc?

• A. $0.010MHCl$ at ${10}^{\circ }C$
• B. $0.010MHCl$ at ${80}^{\circ }C$
• C. $0.10MHCl$ at ${10}^{\circ }C$
• D. $0.10MHCl$ at ${80}^{\circ }C$

Answer 1

The correct option is D $0.10MHCl$ at ${80}^{\circ }C$

The rate of reaction is directly proportional to the concentration of reactants & temperature of the reaction.

So, $0.10MHCl$ at $80^{o}C$ will result in the fastest rate of reaction with $1.00g$ of zinc.