Q1 Question
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When FeS₂ + O₂ → Fe₂O₃ + SO₂ is balanced using the smallest whole-number coefficients, what is the coefficient of O₂?
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Q2 Question
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Which sequence gives the smallest whole-number coefficients for Fe(NO₃)₃ → Fe₂O₃ + NO₂ + O₂, in the order shown?
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Q3 Question
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Aluminium reacts with sulfuric acid according to Al + H₂SO₄ → Al₂(SO₄)₃ + H₂. After balancing with the smallest whole-number coefficients, what is the coefficient of H₂?
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Q4 Question
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Ammonia is oxidised according to NH₃ + O₂ → NO + H₂O. What is the coefficient ratio O₂ : H₂O when the equation is balanced using the smallest whole numbers?
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Q5 Question
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Balance P₄ + KOH + H₂O → PH₃ + KH₂PO₂ using the smallest whole-number coefficients. What is the sum of all five coefficients?
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Q6 Question
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Chlorine reacts with hot concentrated sodium hydroxide according to Cl₂ + NaOH → NaCl + NaClO₃ + H₂O. When balanced with the smallest whole-number coefficients, what is the coefficient of NaCl?
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Q7 Question
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Which equation correctly represents the complete combustion of butane, C₄H₁₀, using the smallest whole-number coefficients?
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Q8 Question
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In the equation Ca₃(PO₄)₂ + SiO₂ + C → P₄ + CaSiO₃ + CO, what are the smallest whole-number coefficients of Ca₃(PO₄)₂, SiO₂ and C, respectively?
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Q9 Question
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The figure shows an unbalanced chemical equation. Which sequence gives the smallest whole-number coefficients for the substances from left to right?
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Q10 Question
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The figure shows copper reacting with dilute nitric acid. Which sequence gives the smallest whole-number coefficients for the five substances from left to right?
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