The questions are about an experiment investigating the reactivity of metals with dilute hydrochloric acid. Specifically, it asks to record observations, arrange metals by reactivity, suggest an extraction method, write a chemical equation, and describe a test for a gaseous product.

a) Record your observations in the space below:

• Test tube I (Metal V - Magnesium): Rapid effervescence/fizzing, metal dissolves, test tube becomes warm.
• Test tube II (Metal X - Iron): Slow effervescence/fizzing, metal slowly dissolves.
• Test tube III (Metal Y - Copper): No visible reaction/no effervescence.

b) Arrange the metals V, X and Y in increasing order of their reactivity.

• Y < X < V (Copper < Iron < Magnesium)

c) Suggest the method of extraction of metal X.
Metal X (Iron) is extracted by reduction with carbon (coke) in a blast furnace.

d) Assuming metal V has a valence of 2, write a balanced chemical equation for its reaction with dilute hydrochloric acid using symbol V.

$$\text{V(s)} + \text{2HCl(aq)} \to \text{VCl}_2\text{(aq)} + \text{H}_2\text{(g)}$$

e) Describe the identity test for the gaseous product in this experiment.
The gaseous product is hydrogen. To test for it, bring a lighted splint close to the mouth of the test tube. A 'pop' sound will be heard.