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- 1. Multiple Choice
Assertion: Chemical reactions are reversible.
Reasoning: In a reversible reaction, the products can react to form the reactants again. The arrow in a chemical equation can be pointed in either direction to show that the reaction is reversible.
A. Both the assertion and reason are true, and the reason is the correct explanation of the assertion.
B. Both the assertion and reason are true, but the reason is not the correct explanation of the assertion.
C. The assertion is true, but the reason is false.
D. The assertion is false, but the reason is true.
- 2. Multiple Choice
Which of the following reactions is exothermic?
a) Burning of magnesium ribbon in air
b) Reaction of sodium and water
c) Formation of water from hydrogen and oxygen
d) None of the above
- 3. Multiple Choice
The product formed when copper reacts with silver nitrate is:
a) Copper nitrate and silver
b) Copper oxide and silver
c) Copper and silver oxide
d) Copper and silver nitrate
- 4. Multiple Choice
Which of the following is not a physical change?
a) Melting of ice
b) Rusting of iron
c) Boiling of water
d) Dissolving sugar in water
- 5. Multiple Choice
The type of reaction in which a single reactant breaks down into two or more products is called:
a) Decomposition reaction
b) Combination reaction
c) Displacement reaction
d) Redox reaction
- 6. Multiple Choice
The products formed when zinc reacts with hydrochloric acid are:
Zinc nitrate and water
Zinc oxide and hydrogen
Zinc chloride and hydrogen
Zinc sulfate and hydrogen
- 7. Multiple Choice
Which of the following is an example of a double displacement reaction?
a) Burning of magnesium ribbon in air
b) Reaction of sodium and water
c) Formation of water from hydrogen and oxygen
d) Reaction of barium chloride and sodium sulfate
- 8. Multiple Choice
In the reaction between sodium and water, the gas evolved is:
Carbon dioxide
Nitrogen gas
Hydrogen gas
Oxygen gas
- 9. Multiple Choice
A chemical reaction that releases energy in the form of heat is called:
Balanced
Displacement
Endothermic
Exothermic
- 10. Multiple Choice
Which of the following statements is true about the electrolysis of water?
A. Oxygen gas is produced at the cathode.
B. Hydrogen gas is produced at the cathode.
C. Water is produced at the anode.
D. Carbon dioxide is produced at the cathode.
- 11. Multiple Choice
Which of the following is an example of a balanced chemical equation?
H2O + O2 → H2O2
2H2O → 2H2 + O2
H2O → H2 + O2
2H2O2 → 2H2O + O2
- 12. Multiple Choice
In a chemical equation, the reactants are written on the _____ side of the arrow.
A. Left
B. Right
C. Top
D. Bottom
- 13. Multiple Choice
In a chemical reaction, a decrease in temperature generally results in:
A. An increase in the rate of reaction
B. A decrease in the rate of reaction
C. No change in the rate of reaction
D. An increase or decrease depending on the reaction
- 14. Multiple Choice
Assertion: In a chemical reaction, the mass of the products is always equal to the mass of the reactants.
Reasoning: This is based on the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. Therefore, the total mass of the reactants must be equal to the total mass of the products.
A. Both the assertion and reason are true, and the reason is the correct explanation of the assertion.
B. Both the assertion and reason are true, but the reason is not the correct explanation of the assertion.
C. The assertion is true, but the reason is false.
D. The assertion is false, but the reason is true.
- 15. Multiple Choice
What is the process of breaking down water into its constituent elements by passing electricity through it called?
A. Hydrolysis
B. Condensation
C. Electrolysis
D. Vaporization
- 16. Multiple Choice
The substance that speeds up a chemical reaction without being consumed in the reaction is called:
Inhibitor
Reactant
Product
Catalyst
- 17. Multiple Choice
What is the difference between a physical change and a chemical change?
A. A physical change involves a change in chemical composition, while a chemical change involves a change in physical appearance.
B. A physical change involves a change in state, while a chemical change involves a change in chemical composition.
C. A physical change involves a change in temperature, while a chemical change involves a change in pressure.
D. A physical change involves a change in mass, while a chemical change involves a change in volume.
- 18. Multiple Choice
What is the balanced chemical equation for the reaction between magnesium and hydrochloric acid?
A. Mg + HCl → MgCl2 + H2
B. MgCl2 + H2 → Mg + HCl
C. Mg + 2HCl → MgCl2 + H2
D. MgCl2 + 2H2 → Mg + 2HCl
- 19. Multiple Choice
The type of chemical reaction in which two or more substances combine to form a single product is called:
Decomposition
Double displacement
Single displacement
Combination
- 20. Multiple Choice
Which of the following is a characteristic of a chemical reaction?
A. The total number of atoms is conserved.
B. The total mass is conserved.
C. The total volume is conserved.
D. The total energy is conserved.
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