This question is about metals. A student investigates the reaction of four different metals, $$\(\mathbf{A}, \mathbf{B}, \mathbf{C}\)$$ and $$\(\mathbf{D}\)$$, with dilute hydrochloric acid. All other conditions are the same in each test-tube. (ii) The student wants to decrease the rate of the reaction in the experiment. State two ways to decrease the rate of this reaction. 1 2

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