Chemical Reactions and Equations for Class 10

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Questions and Answers

In the reaction: CH4 + 2O2 → CO2 + 2H2O, how many moles of oxygen are required to completely react with one mole of methane?

1.5 moles
3 moles
1 mole
2 moles (correct)

What is the balanced chemical equation for the reaction between iron and oxygen?

3Fe + 2O2 → Fe3O4
2Fe + O2 → Fe2O3
Fe + O2 → FeO
4Fe + 3O2 → 2Fe2O3 (correct)

What type of reaction is represented by the equation: 2H2 + O2 → 2H2O?

Single displacement
Combustion
Synthesis (correct)
Decomposition

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Study Notes

In the reaction: CH4 + 2O2 → CO2 + 2H2O, how many moles of oxygen are required to completely react with one mole of methane? What is the balanced chemical equation for the reaction between iron and oxygen? What type of reaction is represented by the equation: 2H2 + O2 → 2H2O?