A-LevelChemistryGroup 29701/12 · Oct/Nov 2024 · Q201 Mark
X is a Group 2 element in either Period 3 or Period 5. X(OH)2 is less soluble in water than Ca(OH)2. When X(NO3)2 is heated, it decomposes. Which row is correct?
AMg X(NO3)2 → X + 2NO2 + O2
BMg 2X(NO3)2 → 2XO + 4NO2 + O2
CSr X(NO3)2 → X + 2NO2 + O2
DSr 2X(NO3)2 → 2XO + 4NO2 + O2
✓ Correct answer
B: Mg 2X(NO3)2 → 2XO + 4NO2 + O2
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