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Chemistry — Second Secondary

Chemistry — Second Secondary

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Chemistry — Second Secondary 2026/2027

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Question bank: Chapter 1 — Chemical Calculation

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1.
CaCO₃ → CaO + CO₂. Heating 10 g of CaCO₃ gives CO₂ of mass
4.4 g
2.2 g
10 g
44 g
2.
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O. The number of moles of oxygen needed to burn 2 mol of ethane is
2
3.5
7
14
3.
N₂ + 3H₂ → 2NH₃. From 1 mol of N₂ and 6 mol of H₂ the moles of NH₃ formed are
1
2
4
6
4.
2Mg + O₂ → 2MgO. 0.4 mol of Mg is heated with 0.1 mol of O₂. The moles of MgO formed are
0.1
0.2
0.4
0.5
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