Chemical Reactions and Equations | Class 10

Question 1. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Decomposition of vegetable matter into compost is an example of exothermic reactions.
Reason (R): Exothermic reaction evolves heat.

A). Both Assertion - A and Reason - R are true and Reason - R is the correct explanation of Assertion- A.
B). Both Assertion - A and Reason - R are true but Reason - R is not the correct explanation of Assertion - A .
C). Assertion - A is true but Reason - R is false.
D). Assertion - A is false but Reason - R is true.

A). Both A and R are true and R is the correct explanation of A.

Question 2. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): When HCl is added to zinc granules, a chemical reaction occurs.
Reason (R): Evolution of hydrogen gas takes place, it indicates the chemical reaction is taking place.

A). Both A and R are true and R is the correct explanation of A.

Question 3.In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Calcium carbonate when heated gives calcium oxide and water.
Reason (R): On heating calcium carbonate, decomposition reaction takes place.

D). A is false but R is true.

Question 4. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Calcium carbonate when heated gives calcium oxide and carbon dioxide.
Reason (R): On heating calcium carbonate, decomposition reaction takes place which produce calcium oxide and carbon dioxide.

A). Both A and R are true but R is the correct explanation of A.

Question 5. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Brown fumes are produced when lead nitrate is heated.
Reason (R): Nitrogen dioxide gas is produced as a by product due to the decomposition of lead nitrate.

A). Both A and R are true but R is the correct explanation of A.

Question 6. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

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.

A). Both A and R are true and R is the correct explanation of A.

Question 7. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Pungent smelling gas is produced when sulphur burns in air.
Reason (R): Sulphur trioxide is formed on reaction of sulphur with oxygen.

C). A is true but R is false.

Question 8. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): In a reaction of copper with oxygen, copper serves as a reducing agent.
Reason (R): The substance which gains oxygen in a chemical reaction acts as a reducing agent.

A). Both A and R are true and R is the correct explanation of A.

Question 9. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): In electrolysis of water, the volume of hydrogen liberated is twice the volume of oxygen formed.
Reason (R): Water (H,0) has hydrogen and oxygen in the ratio of 1:2 by volume.

C). A is true but R is false.

Question 10. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Corrosion of iron is termed as rusting.
Reason (R): Corrosion of iron occurs in presence of water and air.

B). Both A and R are true but R is not the correct explanation of A.

Question 11. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): The balancing of chemical equations is based on law of conservation of mass.
Reason (R): Total mass of reactants is equal to total mass of products.

A). Both A and R are true and R is the correct explanation of A.

Question 12. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): In a balanced chemical equation, total mass of the reactants is equal to the total mass of the products.
Reason (R): Mass can neither be created nor destroyed during a chemical change.

A). Both A and R are true and R is the correct explanation of A.

Question 13. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Iron articles are painted so as to prevent them from rusting.
Reason (R): When the surface of iron is coated with paint, its surface does not come in contact with oxygen and moisture therefore rusting does not take place.

A). Both A and R are true but R is the correct explanation of A.

Question 14. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Chemical reaction changes the physical and chemical state of a substance.
Reason (R): When electric current is passed through water (liquid), it decomposes to produce hydrogen and oxygen gases.

B). Both A and R are true and R is not the correct explanation of A.

Question 15. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.
Reason (R): The decomposition reaction takes place on application of heat, therefore, it is an endothermic reaction.

B). Both A and R are true but R is not the correct explanation of A.

Question 16. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas and it is a displacement reaction.
Reason (R): Zinc reacts with oxygen to form zinc oxide.

B). Both A and R are true but R is not the correct explanation of A.

Question 17. In the questions given below have two statementslabelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Chips manufacturers usually Ilush bags of chips with gas such as nitrogen to prevent the chips from getting oxidised.
Reason (R): This increase the taste ot the chips and helps in their digestion.

C). A is true but R is false.

Question 18. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Exposure of silver chloride to sunlight for a long duration turns grey due to the formation of silver by decomposition of silver chloride.
Reason (R): In this process, sublimation of silver chloride takes place.

C). A is true but R is false.

Question 19. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Rusting of iron metal is the most common form of corrosion.
Reason (R): The effect of rusting of iron can be reversed if they are left open in sunlight.

C). A is true but R is false.

Question 20. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Silver bromide is used on photographic and X-ray film.
Reason (R): Silver bromide is photosensitive and changes to Ag and bromine in presence of sunlight and undergoes decomposition reaction.

A). Both A and R are true and R is the correct explanation of A.

Question 21. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Magnesium ribbon keeps on burning in atmosphere of nitrogen.
Reason (R): Magnesium reacts with nitrogen to form magnesium nitride and this reaction is combination reaction.

A). Both A and R are true and R is the correct explanation of A.

Question 22.In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): A lead nitrate on thermal decomposition gives lead oxide, brown coloured nitrogen dioxide and oxygen gas.
Reason (R): Lead nitrate reacts with potassium iodide to form yellow ppt. of lead iodide and the reaction is double displacement as well as precipitation reaction.

B). Both A and R are true but R is not the correct explanation of A.

Question 23. In the questions given below have two statementslabelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A):
Reason (R):

A). Both A and R are true and R is the correct explanation of A.

Question 24. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A):
Reason (R):

B). Both A and R are true but R is not the correct explanation of A.

Question 25. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Sodium is kept in kerosene oil.
Reason (R): Sodium doesn't react with kerosene oil.

A). Both A and R are true and R is the correct explanation of A.

Question 26. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Corrosion of iron is a serious problem.
Reason (R): Every year an enormous amount of money is spent to replace damaged iron.

B). Both A and R are true but R is not the correct explanation of A.

Question 27. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Changing of colour of copper from reddish brown to black is an example of reduction.
Reason (R): Hydrogen is removed.

A). Both A and R are true but R is the correct explanation of A.

Question 28. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): Silver chloride turns grey in sunlight.
Reason (R): Silver is one of the least reactive metals.

B). Both A and R are true but R is not the correct explanation of A.

Question 29. In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): When water is added to calcium oxide, a large amount of heat is produced.
Reason (R): It is an endothermic reaction.

C). A is true but R is false.

Question 30.In the questions given below have two statements labelled as Assertion (A) and Reason (R ). In the context of the these two statements, which of the following option is correct?

Assertion (A): A chemical equation should be balanced.
Reason (R): Number of atoms of each element should be equal on reactants as well as products side.

A). Both A and R are true and R is the correct explanation of A.

PHYSICS pulse

Chemical Reactions and Equations | Class 10 | Assertion and Reason

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