Assertion Reasoning Quiz

Question 1 of 7

Assertion (A): In the reaction CuO + H₂ → Cu + H₂O, hydrogen gas acts as a reducing agent because it loses oxygen atoms.
Reason (R): Hydrogen gains oxygen during the reaction and undergoes oxidation to form water, thereby reducing copper(II) oxide to copper metal.

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

Select one option. Answers are shown after the test.

Question 2 of 7

Assertion (A): Storing light-sensitive silver bromide reagent bottles inside dark brown amber glass prevents its premature degradation.
Reason (R): Silver bromide decomposes readily upon mild heating at room temperature in the absence of light.

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

Select one option. Answers are shown after the test.

Question 3 of 7

Assertion (A): The burning of natural gas and the decomposition of organic vegetable matter into compost are both classified as exothermic processes.
Reason (R): Chemical decomposition reactions universally require energy input in the form of thermal, radiant, or electrical energy to break chemical bonds.

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

Select one option. Answers are shown after the test.

Question 4 of 7

Assertion (A): In the reaction MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂, hydrochloric acid (HCl) is oxidised to chlorine gas.
Reason (R): Manganese dioxide (MnO₂) acts as a reducing agent in this reaction by losing oxygen atoms.

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

Select one option. Answers are shown after the test.

Question 5 of 7

Assertion (A): Commercial snack and potato chip bags are flushed with unreactive nitrogen gas prior to sealing.
Reason (R): Molecular nitrogen (N₂) makes up roughly 78% of Earth's atmosphere by volume.

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

Select one option. Answers are shown after the test.

Question 6 of 7

Assertion (A): Photosynthesis occurring in chloroplasts of green plants is classified as an endothermic reaction.
Reason (R): Oxygen gas liberated as a byproduct during photosynthesis originates entirely from the photolysis of water molecules.

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

Select one option. Answers are shown after the test.

Question 7 of 7

Assertion (A): Mixing aqueous solutions of potassium iodide and lead nitrate yields a canary-yellow precipitate.
Reason (R): A double displacement precipitation reaction occurs in which lead ions (Pb²⁺) and iodide ions (I⁻) combine to form insoluble lead iodide (PbI₂).

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

Select one option. Answers are shown after the test.

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