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Punjab (PTB) · Chapter test · Free

10th Class Chemistry Chapter 4 TestREACTION KINETICS

30 marks · 40 minutes · 21 questions. Covers: CHAP 17: REACTION KINETICS.

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10th Class Chemistry Chapter 4 Test

10th Class · Chemistry · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 30Time: 40 minutes

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

  1. Once bound with the reactant molecule, the particular chemical bonds in the reactant molecule are:

    1. Strengthened

    2. Broken completely into ions

    3. Sufficiently weakened

    4. Replaced by metallic bonds

  2. When reactant particles come close to each other at the time of collision, their kinetic energy converts into:

    1. Potential energy

    2. Chemical energy

    3. Heat energy

    4. Electrical energy

  3. The matter is composed of tiny, constantly moving particles according to which theory?

    1. Atomic theory

    2. Kinetic theory

    3. Collision theory

    4. Quantum theory

  4. Which gas production rate can be monitored to determine the best time for fruit harvesting?

    1. Ethene

    2. Nitrogen

    3. Hydrogen

    4. Carbon monoxide

  5. When CaO (quick lime) reacts with water, what happens to the temperature?

    1. It remains at

    2. It increases

    3. It decreases

    4. It fluctuates randomly

  6. The number of collisions per unit volume of the reaction mixture is called:

    1. Collision energy

    2. Activation energy

    3. Collision frequency

    4. Collision force

  7. When a magnesium ribbon is burnt in an open crucible, the mass of the product (MgO) formed is:

    1. Greater than the reactant (Mg)

    2. Less than the reactant (Mg)

    3. Equal to the reactant (Mg)

    4. Half of the reactant (Mg)

  8. An increase in temperature enhances the rate of reaction primarily by increasing the:

    1. Activation energy

    2. Potential energy of products

    3. Velocities of their movements

    4. Mass of the reactants

  9. A substance that alters the rate of a chemical reaction but is not consumed during the reaction is a:

    1. Reactant

    2. Product

    3. Catalyst

    4. Solvent

  10. Which form of a solid reactant will react the fastest with a liquid?

    1. Finely divided powdered

    2. A few medium-sized lumps

    3. One large crystal

    4. A flast sheet of the solid

Q2. Short questions (Attempt any 6 of 8 · 6 × 2 = 12)

  1. How does the frequency of collisions change with an increase in reactant particles per unit volume?

  2. Why does a test tube feel cold when ammonium chloride is dissolved in water?

  3. Does the total mass of substances change during a chemical reaction?

  4. Explain into which form of energy the kinetic energy is converted during particle collisions?

  5. How can farmers use the rate of ethene production to their advantage?

  6. Define activation energy.

  7. What happens to the rate of most reactions when the temperature is increased by 10°C?

  8. What is the effect of surface area on the reaction rate of solids?

Q3. Long questions (Attempt any 2 of 3 · 2 × 4 = 8)

  1. How does chemical kinetics play an important role in the food industry?

  2. Discuss the following factors affecting the rate of a reaction: (a) Effect of concentrations of the reactants. (b) Effect of temperature at which a reaction is carried out. 

  3. What is activation energy? Explain the concept of activation energy and the path of a reaction with the help of a potential energy diagram.