Chemical Reactions and Equations | Class 10 | MCQ Quiz 1

1. What is a chemical reaction?

A physical change
A change in state
A change in the arrangement of atoms
None of the above

2. What is the balanced chemical equation for the reaction between hydrogen gas and oxygen gas to form water?

H2 + O2 -> H2O
2H2 + O2 -> 2H2O
H2O -> H2 + O2
2H2O -> 2H2 + O2

3. What is the product formed when zinc metal reacts with hydrochloric acid?

Hydrogen gas and zinc chloride
Oxygen gas and zinc chloride
Hydrogen gas and zinc oxide
Oxygen gas and zinc oxide

4. What is the chemical equation for the reaction between calcium oxide and water?

CaO + H2O -> Ca(OH)2
CaO + 2H2O -> Ca(OH)2 + H2
CaO + H2O -> CaH2O2
CaO + 2H2O -> CaH2O2 + H2O

5. What is the type of reaction when a metal reacts with a non-metal?

Combination reaction
Decomposition reaction
Displacement reaction
Double displacement reaction

6. What is the balanced chemical equation for the reaction between potassium permanganate and hydrogen peroxide?

KMnO4 + H2O2 -> K2MnO4 + 2H2O + O2
KMnO4 + 2H2O2 -> K2MnO4 + 2H2O + O2
KMnO4 + H2O2 -> K2MnO2 + 2H2O + O2
KMnO4 + 2H2O2 -> K2MnO2 + 2H2O + O2

7. What is the product formed when copper metal reacts with silver nitrate solution?

Copper nitrate and silver metal
Copper metal and silver nitrate solution
Copper nitrate and silver nitrate
Copper oxide and silver metal

8. What is the type of reaction when a compound breaks down into simpler substances?

Combination reaction
Decomposition reaction
Displacement reaction
Double displacement reaction

9. What is the balanced chemical equation for the reaction between sodium chloride and silver nitrate?

NaCl + AgNO3 -> NaNO3 + AgCl
NaNO3 + AgCl -> NaCl + AgNO3
NaCl + AgNO3 -> NaCl2 + Ag
NaCl + AgNO3 -> NaAgNO3 + Cl

10. What is the purpose of balancing a chemical equation?

To conserve mass
To conserve energy
To conserve momentum
To conserve charge

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