Waec Model Questions Vol1 2022 Chemistry Question 2

An unknown metallic solid is to be identified using a flame test and its reaction with dilute hydrochloric acid. The following apparatus are provided: a clean nichrome wire loop, a Bunsen burner, a test tube containing dilute HCl, a test tube containing aqueous Na₂CO₃, and a set of labelled colour cards for flame colours. The procedure is: 1. Clean the wire loop and dip it into a small amount of the metal sample. 2. Place the loop in the flame of the Bunsen burner and observe the colour of the flame. 3. Record the observed flame colour using the colour card. 4. Place a small piece of the metal into a test tube containing dilute HCl and note the nature of the reaction (e.g., effervescence, colour change). 5. To the resulting solution add a few drops of Na₂CO₃ solution and note any precipitate formed. Observations recorded by the student are: - Flame colour: bright orange‑red. - Reaction with dilute HCl: vigorous effervescence with the evolution of a colourless gas. - After addition of Na₂CO₃: a white precipitate forms instantly. Using the observations, answer the following: