This question is about metals and their reactions. A student investigates the reaction of four different metals, $$\(\mathbf{A}, \mathbf{B}, \mathbf{C}\)$$ and $$\(\mathbf{D}\)$$, with dilute hydrochloric acid. All other conditions are the same in each test-tube. The results of the experiment are shown in Fig. 5.1. Fig. 5.1 (i) Put the metals, $$\(\mathbf{A}, \mathbf{B}, \mathbf{C}\)$$ and $$\(\mathbf{D}\)$$, in their order of reactivity. (ii) One way the student can increase the rate of the reaction in the experiment is to use a higher concentration of acid. State two other ways to increase the rate of this reaction. 1 2 (iii) Hydrogen gas is produced in this experiment. Describe a test for hydrogen gas. test observations . N (iv) State the formula of the ion that is present in all acids.

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