Which of the following is not an example of reversible reaction?

Catalytic oxidation of sulphur dioxide

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Passage of steam over heated iron

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Thermal decomposition of calcium carbonate

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None of the above

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Solution

The correct option is D None of the above
A, B, C all are examples of reversible reactions.
$2 S O_{2} + O_{2} ⇌ 2 S O_{3}$
$3 F e + 4 H_{2} O ⇌ F e_{3} O_{4} + 4 H_{2}$
$C a C O_{3} ⇌ C a O + C O_{2}$

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