10th CBSE CHEMICAL REACTIONS AND EQUATIONS

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.

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

Tags

NGSS.HS-PS1-4

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

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

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

Tags

NGSS.MS-PS1-2

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

In the reaction between sodium and water, the gas evolved is:

• Carbon dioxide

• Nitrogen gas

• Hydrogen gas

• Oxygen gas

Tags

NGSS.MS-PS1-2

A chemical reaction that releases energy in the form of heat is called:

• Balanced

• Displacement

• Endothermic

• Exothermic

Tags

NGSS.HS-PS1-4

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.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-5