The diagram below shows a set-up used to produce carbon dioxide gas. Dilute hydrochloric acid was reacted with calcium carbonate.

1. aState two observations that would be made in the test-tube during the reaction. [2]
2. bName a compound formed in the test-tube other than carbon dioxide. [1]
3. cCarbon dioxide is bubbled in water as shown. Name the solution formed. [1]
4. dThe water in the beaker is replaced with lime water. State an observation that will be made as carbon dioxide bubbles in lime water. [1]

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