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Chemistry Past Questions and Answers

Post Utme Chemistry Questions

Question 686:

The equation CH₄ + 2O₂ → CO₂ + 2H₂O shows methane undergoing:

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A Neutralization process
B Decomposition process
C Double displacement
D Complete combustion

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Question 687:

In the equation 2PbO + C → 2Pb + CO₂, the ratio of lead oxide to lead is:

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A 1 : 2 ratio
B 2 : 1 ratio
C 1 : 1 ratio
D 3 : 1 ratio

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Question 688:

During balancing of equations, the formulas of compounds should:

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A Be removed completely
B Be divided equally
C Be altered freely
D Remain unchanged

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Question 689:

In the equation 2Fe + 3Cl₂ → 2FeCl₃, the ratio of iron to chlorine is:

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A 1 : 2 ratio
B 3 : 2 ratio
C 2 : 3 ratio
D 2 : 1 ratio

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Question 690:

The main reason for using coefficients in equations is to:

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A Increase reaction speed
B Change the products formed
C Reduce compound masses
D Balance atom numbers

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