Free PDF Download of CBSE Class 10 Science Chapter 1 Chemical Reactions and Equations Assertion Reason Questions Class 10 Science. Assertion and Reason Questions for Class 10 Science with Answers were Prepared Based on the Latest Exam Pattern. Students can solve NCERT Class 10 Science Chemical Reactions and Equations to know their preparation level.
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Chemical Reactions and Equations Class 10 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below:
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct
Assertion: Stannous chloride is a powerful oxidising agent which oxidizes mercuric chloride to mercury.
Reason: Stannous chloride gives a grey precipitate with mercuric chloride, but stannic chloride does not do so.
(c) If Assertion is correct but Reason is incorrect.
Assertion: The corrosion of iron is commonly known as rusting.
Reason: Corrosion of iron occurs in presence of water and air.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
Assertion: A reducing agent is a substance which can either accept electrons.
Reason: A substance that helps in oxidation is known as a reducing agent.
(d) If Assertion is incorrect but Reason is correct
Assertion: The balancing of chemical equations is based on law of conservation of mass.
Reason: Total mass of reactants is equal to the total mass of products.
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
Assertion (A): Carbon dioxide turns lime water milky.
Reason (R): Carbon dioxide sullies the water.
(c) Assertion (A) is true but reason (R) is false. Carbon dioxide reacts with lime water (calcium hydroxide) to form milky precipitate of calcium carbonate.
Assertion (A): Sodium metal is stored under Kerosene.
Reason (R): Metallic sodium melts when exposed to air.
(c) Assertion (A) is true but reason (R) is false.
Assertion (A): To dilute sulphuric acid, acid is added to water and not water to acid.
Reason (R): Specific heat of water is quite large.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Assertion(A): Calcium carbonate when heated gives calcium oxide and water.
Reason (R): On heating calcium carbonate, a decomposition reaction takes place.
(d) A is false but R is true.
Assertion(A): White silver chloride turns grey in sunlight.
Reason (R): Decomposition of silver chloride in presence of sunlight takes place to form silver metal and chlorine gas.
(d) A is false but R is true.
Assertion(A): Pungent-smelling gas is produced when sulphur burns in the air.
Reason (R): Sulphur trioxide is formed on the reaction of sulphur with oxygen.
(c) A is true but R is false.
Assertion (A): In a chemical reaction, the total mass of reactants is equal to the total mass of products.
Reason (R): According to the law of conservation of mass, matter can neither be created nor destroyed in a chemical reaction.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Assertion (A): Rusting of iron is not an example of a chemical change.
Reason (R): Rusting involves the chemical reaction between iron, oxygen, and water, resulting in the formation of iron oxide.
(d) A is false but R is true.
Assertion (A): The reactants in a chemical reaction are written on the left side of the chemical equation.
Reason (R): The reactants are the starting substances that undergo a chemical change to form products.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Assertion (A): A balanced chemical equation obeys the law of conservation of mass.
Reason (R): In a balanced chemical equation, the number of atoms of each element is the same on both sides of the equation.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Assertion (A): Combustion reactions are exothermic.
Reason (R): Combustion reactions release energy in the form of heat and light.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Assertion (A): Displacement reactions involve the exchange of ions between reactants.
Reason (R): In displacement reactions, a more reactive element displaces a less reactive element from its compound.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Assertion (A): A single displacement reaction is a type of redox reaction.
Reason (R): In a single displacement reaction, there is a transfer of electrons from one species to another.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Assertion (A): Chemical equations represent the identities and relative quantities of reactants and products in a chemical reaction.
Reason (R): Chemical equations provide a concise way to represent chemical reactions using chemical formulas and coefficients.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Assertion (A): Acid-base neutralization reactions produce salt and water as products.
Reason (R): In acid-base neutralization, an acid reacts with a base to form a salt and water.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
Assertion (A): Decomposition reactions involve the breakdown of a compound into simpler substances.
Reason (R): Decomposition reactions require the input of energy to break the chemical bonds in the compound.
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion
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