Statement I ; Decomposition sodium nitrate is a redox reaction.
Statement II ; Formation of calcium carbonate from calcium oxide and carbon dioxide is a redox reaction.

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Both statements I and II are correct

Statement I is correct and statement II is incorrect

Statement I is incorrect and statement II is correct

Both statements I and II are incorrect

answer is B.

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Detailed Solution

$\overset{+ 2}{Ca} O + \overset{+ 4}{C} O_{2} \to \overset{+ 2}{Ca} \overset{+ 4}{C} O_{3} . . . . not a redox reaction; 2 Na \overset{+ 5}{N} O_{3} \to 2 Na \overset{+ 3}{N} O_{2} + \overset{0}{O_{2}} . . . . . . . . . a redox reaction;$

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