An aqueous sample of $$\(X\)$$ is heated with aqueous sodium hydroxide and small pieces of aluminium. A gas is produced which turns damp red litmus paper blue. Aqueous sodium hydroxide is added to a second aqueous sample of $$\(X\)$$. A pale green precipitate is observed. What is $$\(X\)$$ ?
A.
ammonium nitrate
B.
chromium(II) chloride
C.
iron(II) nitrate
D.
iron(II) sulfate
Exam No：0620_m24_qp_12 Year：2024 Question No：40
Answer:
B
Knowledge points:
8.4.1.1. have high densities
8.4.1.2. have high melting points
8.4.1.3. form coloured compounds
8.4.1.4. often act as catalysts as elements and in compounds
8.4.2. Describe transition elements as having ions with variable oxidation numbers, including iron(II) and iron(III)
Solution:
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