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Test: Chemical Reactions & Equations - Class 10 MCQ


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15 Questions MCQ Test Science Class 10 - Test: Chemical Reactions & Equations

Test: Chemical Reactions & Equations for Class 10 2024 is part of Science Class 10 preparation. The Test: Chemical Reactions & Equations questions and answers have been prepared according to the Class 10 exam syllabus.The Test: Chemical Reactions & Equations MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Chemical Reactions & Equations below.
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Test: Chemical Reactions & Equations - Question 1

Which of the following statement is incorrect?

Detailed Solution for Test: Chemical Reactions & Equations - Question 1

An oxidizing agent oxidizes other substances and gains electrons; therefore, its oxidation state decreases. Hence, it gets reduced.

Test: Chemical Reactions & Equations - Question 2

What is the term for the process where food materials containing fat and oil change in taste and odor when left exposed to air for an extended period?

Detailed Solution for Test: Chemical Reactions & Equations - Question 2
Rancidity is the term used to describe the process in which food items containing fats and oils undergo changes in taste and odor when exposed to air for a prolonged period. This change is primarily caused by the oxidation of the fats and oils present in the food material. Preventative measures such as storing food in air-tight containers, employing nitrogen packaging, refrigeration, or adding antioxidants can help mitigate rancidity and prolong the shelf life of food products.
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Test: Chemical Reactions & Equations - Question 3

The word-equation for the reaction of magnesium with oxygen can be written as Magnesium + _____ → Magnesium oxide.

Detailed Solution for Test: Chemical Reactions & Equations - Question 3

In the given chemical reaction, magnesium reacts with oxygen to form magnesium oxide. The missing element that reacts with magnesium in this case is oxygen.

Test: Chemical Reactions & Equations - Question 4

What type of reaction is characterized by the formation of a single product from two or more reactants?

Detailed Solution for Test: Chemical Reactions & Equations - Question 4

In a combination reaction, multiple reactants combine to form a single product. An example is the reaction between calcium oxide and water to produce calcium hydroxide. This type of reaction involves the synthesis of a new compound from the combining of elements or compounds.

Test: Chemical Reactions & Equations - Question 5

Assertion (A): Chemical equations can be made more concise and useful if we use chemical formulae instead of words.

Reason (R): A chemical equation represents a chemical reaction.

Detailed Solution for Test: Chemical Reactions & Equations - Question 5
  • The assertion is correct. Chemical equations are indeed more concise and useful when represented using chemical formulae.
  • The reason is also correct. A chemical equation serves as a representation of a chemical reaction.
  • However, the reason is not the correct explanation of the assertion. While the reason is true, it does not explain why using chemical formulae makes chemical equations more concise and useful.
  • Therefore, the correct answer is Option B: If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
Test: Chemical Reactions & Equations - Question 6

Choose the correctly matched pair.

Detailed Solution for Test: Chemical Reactions & Equations - Question 6
  • Option B: (b) Zinc + Hydrochloric acid → Zinc chloride + Hydrogen is correct. The correct reaction is Zinc + Hydrochloric acid → Zinc chloride + Hydrogen gas. Though the products are correct,
  • Option C: (c) Lead nitrate + Potassium iodide → Lead iodide + Potassium nitrate is correct. The actual reaction is Lead nitrate + Potassium iodide → Lead iodide + Potassium nitrate 
  • Option D: (d) Magnesium + Nitrogen → Magnesium nitride is correct. This reaction is discussed in the provided content. The correct reaction would be Magnesium + Nitrogen → Magnesium nitride (Mg3N2)
    so all options are correct so 
    Option (A) is correct
Test: Chemical Reactions & Equations - Question 7

Choose the correctly matched pair.

Detailed Solution for Test: Chemical Reactions & Equations - Question 7
  • Let's analyze each option to determine the correctly matched pair:
  • Option A: (a) Burning of coal - C(s) + O2(g) → CO(g)
  • This is a incorrect chemical equation for the burning of coal, which is a combination reaction. 
  • Option B: (b) Formation of water - 2H2(g) + O2(g) → 2H2O2(l)
  • This is also a incorrect chemical equation for the formation of water from hydrogen and oxygen, which is another example of a combination reaction.
  • Option C: (c) Respiration - C6H12O6(aq) + 6O2(aq) → 6CO2(aq) + 6H2O2(l) + energy
  • This equation incorrectly represents the process of respiration, an exothermic reaction where glucose reacts with oxygen to produce carbon dioxide, water, and energy.
  • Option D: (d) Whitewashing reaction - Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
  • This is the correct chemical equation for the whitewashing reaction. When calcium hydroxide reacts with carbon dioxide, it forms calcium carbonate (which gives a shiny finish on walls) and water.
Test: Chemical Reactions & Equations - Question 8

During a chemical reaction, atoms of one element do not change into those of another element. Nor do atoms disappear from the mixture or appear from elsewhere. Chemical reactions involve the breaking and making of bonds between atoms to produce new substances. This process is known as _______.

Detailed Solution for Test: Chemical Reactions & Equations - Question 8

Chemical transformation refers to the process in a chemical reaction where atoms rearrange by breaking and forming bonds to create new substances. This process does not involve the conversion of atoms from one element to another, nor do atoms disappear or appear out of nowhere.

Test: Chemical Reactions & Equations - Question 9

Assertion (A): Burning of natural gas is an example of an exothermic reaction.

Reason (R): Exothermic reactions release heat energy along with the formation of products.

Detailed Solution for Test: Chemical Reactions & Equations - Question 9

Let's analyze the statements:

Assertion (A): Burning of natural gas is an example of an exothermic reaction.

  • This is true because burning natural gas (methane, CH4) releases heat energy.

Reason (R): Exothermic reactions release heat energy along with the formation of products.

  • This is also true because exothermic reactions are characterized by the release of heat energy during the reaction process.

Since both statements are true and the Reason correctly explains the Assertion: If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Test: Chemical Reactions & Equations - Question 10
What is the term for the process where food materials containing fat and oil change in taste and odor when left exposed to air for an extended period?
Detailed Solution for Test: Chemical Reactions & Equations - Question 10
Rancidity is the term used to describe the process in which food items containing fats and oils undergo changes in taste and odor when exposed to air for a prolonged period. This change is primarily caused by the oxidation of the fats and oils present in the food material. Preventative measures such as storing food in air-tight containers, employing nitrogen packaging, refrigeration, or adding antioxidants can help mitigate rancidity and prolong the shelf life of food products.
Test: Chemical Reactions & Equations - Question 11

What type of chemical reaction is represented by the following equation: C(s) + O2(g) → CO2(g) accompanied by the release of heat?

Detailed Solution for Test: Chemical Reactions & Equations - Question 11

The reaction C(s) + O2(g) → CO2(g) represents an exothermic reaction. In exothermic reactions, energy is released from the reaction system into the surroundings, usually in the form of heat, light, or sound. This particular reaction involves the formation of carbon dioxide (CO2) from carbon (C) and oxygen (O2) with the release of heat.

Test: Chemical Reactions & Equations - Question 12

Choose the correctly matched pair:

Detailed Solution for Test: Chemical Reactions & Equations - Question 12
  • Option A: CaO + H₂O → Ca(OH)₂ + Heat - This is correctly matched as a Combination Reaction. In this reaction, calcium oxide (CaO) reacts with water (H₂O) to form calcium hydroxide (Ca(OH)₂) and releases heat. This is a classic example of a combination reaction where two or more substances combine to form a single product.
  • Option B: Fe + 4H₂O → Fe₃O₄ + 4H₂ - This reaction is incorrectly labeled as a Decomposition Reaction. It is actually a redox reaction involving the oxidation of iron and the reduction of water.
  • Option C: 3Fe + 4H₂O → Fe₃O₄ + 4H₂ - This is also incorrectly labeled. Although there is a combination of elements involved, it is best described as a redox reaction rather than a simple Decomposition reaction.
  • Option D: CO + 2H₂ → CH₃OH - This is incorrectly matched as a Displacement Reaction. It is actually a synthesis reaction where carbon monoxide (CO) and hydrogen (H₂) combine to form methanol (CH₃OH).
Test: Chemical Reactions & Equations - Question 13
Which type of chemical reaction involves a single reactant breaking down when exposed to heat, light, or electricity resulting in the formation of two or more products?
Detailed Solution for Test: Chemical Reactions & Equations - Question 13
A decomposition reaction involves a single reactant breaking down under the influence of heat, light, or electricity to produce two or more products. This type of reaction is characterized by the breakdown of a compound into simpler substances.
Test: Chemical Reactions & Equations - Question 14

When Iron nails are added to an aquous solution of copper sulphate, a chemical change occurs, which of the following is NOT true about this reaction?

Detailed Solution for Test: Chemical Reactions & Equations - Question 14

Fe(s) + CuSO4​ ⟶ Cu(s) + FeSO4​

When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green. This reaction shows that iron is more reactive than copper as it displaces copper from its solution and iron passes into solution as Fe2+ ions and ferrous sulphate solution is formed.

Test: Chemical Reactions & Equations - Question 15

Fe2O3 + 2Al → Al2O3 + 2Fe  This reaction is an example of

Detailed Solution for Test: Chemical Reactions & Equations - Question 15

Fe2O3 + 2Al → Al2O3 + 2Fe
This reaction is an example of a displacement reaction.
Here, Aluminum is more reactive metal than Fe. Therefore, Al will displace Fe from its oxide.

​​​​​​​So Option D is correct

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