A dilute hydrochloric acid is added to a flask containing time stone a gas is produced which is dissolved in time water in a test tube a white precipitate is formed the precipitate is of:
Correct answer: B. CaCO3
- A. CaSO4
- B. CaCO3
- C. CaCl2
- D. MgCO3
Explanation
In this reaction, dilute hydrochloric acid reacts with a carbonate compound, releasing carbon dioxide gas (CO2). This gas dissolves in water to form carbonic acid (H2CO3), which subsequently reacts with calcium ions to precipitate calcium carbonate (CaCO3), a white solid. This explains why CaCO3 is the correct answer. The other options are incorrect because:CaSO4: Forms with sulfuric acid, not hydrochloric acid.CaCl2: Soluble in water, does not precipitate.MgCO3: Although it can form a precipitate, it does not match the described reaction sequence.
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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