For the following question two statements are given – one labelled Assertion (A) and the other labelled Reason (R).Assertion: Calcium carbonate on heating breaks down into calcium oxide and carbon dioxide gas.Reason: Calcium carbonate is a base.Select the correct answer to the question.

Assertion: Calcium carbonate on heating breaks down into calcium oxide and carbon dioxide gas.Reason: Calcium carbonate is a base

For the following question two statements are given – one labelled Assertion (A) and the other labelled Reason (R).Assertion: In a reaction of zinc oxide with carbon, zinc oxide is reduced to zinc.Reason: In a chemical reaction, a substance is reduced when it gains oxygen.Select the correct answer to the question

For the following question two statements are given – one labelled Assertion (A) and the other labelled Reason (R).Assertion: Magnesium ribbon burns with a dazzling flame in air.Reason: A white substance magnesium nitride is formed.Select the correct answer to the question.

Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).Assertion (A) : Nitrogen has higher ionisation energy than oxygen          Reason (R) : Nitrogen has half filled orbital.A Both (A) and (R) are correct and (R) is the correct explanation of (A). B Both (A) and (R) are correct but (R) is not the correct explanation of (A) C (A) is correct but (R) is not correct D (A) is not correct but (R) is correct

Consider the decomposition of calcium carbonate shown below. Which of the following statements correctly describes this reaction as it occurs in a test tube?CaCO3(s) + 42.5 kcal → CaO(s) + CO2(g)