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Class 10 Science Chapter 1: Chemical Reactions and Equations

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Class 10 Science Chapter 1: Chemical Reactions and Equations

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Questions and Answers

Which type of reaction involves breaking down a single compound into two or more simpler substances?

Combination reaction

Decomposition reaction (correct)

Double displacement reaction

Displacement reaction

In a decomposition reaction, when energy is supplied in the form of heat, what is the likely result?

Release of energy (correct)

No change in energy

Formation of more complex compounds

Formation of a single compound

Which of the following is an example of a decomposition reaction where energy is supplied in the form of light?

2AgCl → 2Ag + Cl₂

2KClO₃ → 2KCl + 3O₂

CaCO₃ → CaO + CO₂ (correct)

2H₂O → 2H₂ + O₂

Why are decomposition reactions considered the opposite of combination reactions?

Decomposition reactions form simpler substances, while combination reactions form complex compounds Signup and view all the answers

Which reaction involves the interchange of ions between two compounds to form new compounds?

Double displacement reaction Signup and view all the answers

In the refining of silver, what type of reaction is involved when copper displaces silver from a silver nitrate solution?

Displacement reaction Signup and view all the answers

What characterizes a precipitation reaction?

Formation of a solid from a solution Signup and view all the answers

Which statement best describes respiration as an exothermic reaction?

$\text{CO}_2$ is released during respiration Signup and view all the answers

'Hydrogen chloride(g)' is an example of a product in which type of reaction?

'Hydrogen + Chlorine → Hydrogen chloride' Signup and view all the answers

What distinguishes double displacement reactions from displacement reactions?

Double displacement reactions involve exchanging ions between compounds, while displacement reactions involve one element displacing another in a compound. Signup and view all the answers