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Class 10 Chemistry Chapter 17 Reaction Kinetics Test 2
Class 10 chemistry chapter 17 reaction kinetics test answers
Prepare your exam easily for the Class 10 Chemistry Chapter 17 Reaction Kinetics Class Test 2 with the Punjab Board 2027 Model Papers. We designed/ make this Chemistry paper to help students prepare for their Punjab Board Class 10 Chemistry examinations according to the latest syllabus. Practice important questions from Chapter 17: Reaction Kinetics to improve your understanding of chemical reaction rates, factors affecting reaction rates, and other important concepts. These Class 10 Chemistry model papers are useful for exam preparation, self-assessment, and revision. Visit 786Times.com for more Punjab Board 2027 model papers, chapter-wise Chemistry tests, and educational resources for students.
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1. The minimum energy required to start a chemical reaction is called:
(a) Kinetic energy
(b) Activation energy
(c) Potential energy
(d) Collision energy
Answer: (b) Activation energy
2. The information provided by the energy of activation to understand
(a) concentration of product
(b) concentration of reactant
(c) mechanism of a reaction
(d) light energy
Answer: (c) mechanism of a reaction
3. How does increasing temperature affect the rate of a reaction?
(a) decreases
(b) remains constant
(c) increases
(d) stops
Answer: (c) increases
4. According to collision theory, the rate of a reaction depends on:
(a) Only the mass of reactants
(b) Number of successful collisions
(c) Colour of reactants
(d) Shape of the container
Answer: (b) Number of successful collisions
5. Combustion of coal is faster in:
(a) Air (21% oxygen)
(b) Pure oxygen
(c) Carbon dioxide
(d) Nitrogen
Answer: (b) Pure oxygen
6. At the start of the reaction, the rate is:
(a) Very slow
(b) Moderate
(c) Very fast
(d) Zero
Answer: (c) Very fast
7. In reactions involving gases, the rate can be increased by:
(a) Reducing pressure
(b) Increasing pressure
(c) Reducing temperature
(d) Using smaller containers
Answer: (b) Increasing pressure
8. Catalyst used for the addition of hydrogen to ethane
(a) Na
(b) HCl
(c) Zn
(d) Pt
Answer: (d) Pt
9. Fruits and vegetables ripen due to:
(a) Heat alone
(b) Enzymatic reactions
(c) Pressure
(d) Freezing
Answer: (b) Enzymatic reactions
10. How can rapid spoilage during transportation be prevented by?
(a) heating the food
(b) refrigeration
(c) exposing to sunlight
(d) shaking the food
Answer: (b) refrigeration
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Attempt any 10 Questions.10 × 2 = 20
i.Why is the study of rate of reaction important?
It helps us speed up useful reactions (industry, medicines), slow down harmful ones (rusting, food spoilage) and choose the best conditions for production.
ii.What is an effective collision?
A collision between reactant particles having at least the activation energy and the correct orientation, so that products are formed.
iii.What is activation energy?
The minimum energy that colliding particles must have to start a chemical reaction (symbol: Ea).
iv.State the law of conservation of mass.
Mass can neither be created nor destroyed in a chemical reaction; total mass of reactants = total mass of products.
v.Give an example where mass decreases during a reaction.
Burning of coal/wood in open air – the ash weighs less because gases (CO2, water vapour) escape. Also heating CaCO3 in an open vessel.
vi.Define endothermic reaction. Give example.
A reaction that absorbs heat from the surroundings (ΔH is positive). Example: CaCO3 → CaO + CO2 (on heating).
vii.By how much does the rate of reaction change for many reactions with a 10°C rise?
The rate of reaction roughly doubles (increases about 2 to 3 times) for every 10°C rise in temperature.
viii.Write the name of factor that affecting the rates of reaction.
Nature of reactants, concentration, temperature, surface area, pressure (for gases), catalyst, light.
ix.How does increasing concentration affect reaction rate?
More particles per unit volume → more frequent collisions → more effective collisions, so the rate increases.
x.How does concentration affect the rate of reaction?
Higher concentration increases the rate (greater number of collisions per second); lower concentration decreases it.
xi.Define a catalyst.
A substance that changes the rate of a reaction without being used up; it lowers the activation energy.
xii.What are enzymes?
Biological catalysts (proteins) produced by living cells that speed up reactions in living things.
xiii.Why are enzymes highly specific?
Each enzyme has an active site of a particular shape that fits only one substrate (lock-and-key model).
xiv.What causes fruits and vegetables to ripen?
Enzymatic reactions (helped by the plant hormone ethylene) change starch into sugar and soften the fruit.
