Science Practice Quiz 8

Q1.What form of energy is responsible for causing the decomposition of silver bromide, as per the provided text?

A. Heat energy B. Electrical energy C. Sound energy D. Sunlight

Q2.Decomposition reactions generally require energy for breaking down reactants. Which of the following is NOT mentioned as a form of energy that can cause decomposition reactions in the text?

A. Heat B. Light C. Electricity D. Kinetic energy

Q3.How are reactions defined in which energy is absorbed?

A. Exothermic reactions B. Endothermic reactions C. Redox reactions D. Neutralization reactions

Q4.In Activity 1.9, what is one of the key observations to be made after dipping iron nails in copper sulphate solution?

A. Measuring the temperature change of the solution. B. Comparing the intensity of the blue colour of copper sulphate solutions. C. Checking the pH of the solution. D. Observing the formation of gas bubbles.

Q5.What is observed when an iron nail is dipped in copper sulphate solution?

A. Iron nail becomes brownish and copper sulphate solution fades. B. Iron nail becomes bluish and copper sulphate solution darkens. C. Iron nail dissolves completely and solution turns colourless. D. No visible change occurs.

Q6.Which of the following best describes a displacement reaction?

A. A reaction where one element displaces another element from its compound. B. A reaction where two compounds exchange their ions to form new compounds. C. A reaction where a single reactant breaks down into two or more simpler products. D. A reaction where two or more reactants combine to form a single product.

Q7.According to the provided text, which of the following elements are more reactive than copper, displacing it from its compounds?

A. Iron, Zinc, and Lead B. Silver, Gold, and Platinum C. Mercury, Tin, and Nickel D. Aluminium, Magnesium, and Calcium

Q8.What is a precipitate in a chemical reaction?

A. A soluble substance formed in water. B. An insoluble substance formed during a reaction. C. A gas released during a reaction. D. A liquid product formed from two gases.

Q9.What is a precipitation reaction?

A. Any reaction that produces a gas. B. Any reaction that produces a precipitate. C. Any reaction that absorbs heat. D. Any reaction that changes the colour of the solution.

Q10.When sodium sulphate solution is mixed with barium chloride solution, what are the main products formed?

A. Barium sulphate and sodium chloride B. Sodium chloride and barium oxide C. Sodium sulphate and barium hydroxide D. Barium chloride and sodium oxide

Sign in with Email

Science Practice Quiz 8