Short answerEasy1 mark
4(iv)
Given below are some chemicals. Using suitable chemicals from the box given above, write balanced chemical equations for the preparation of the following salts. (Note: The chemicals may be used more than once, if needed.)
Iron (II) chloride
Topic: Metallurgy, ores, extraction and alloys
Previous-year question practice database
Answer
Exam answer
Fe + 2HCl → FeCl₂ + H₂↑.
Explanation
Iron is above hydrogen in the activity series, so it displaces hydrogen from dilute hydrochloric acid and the salt formed is the ferrous (iron II) chloride. Use dilute acid and iron metal here, not the carbonate route used for parts (a) and (b): a metal + dilute acid gives salt + hydrogen, while a carbonate + acid gives salt + water + carbon dioxide.
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