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Is the decomposition of magnesite a redo...

Is the decomposition of magnesite a redox reaction ? 

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Megnesite decomposes on heating to give magnesia and carbon dioxide.
`MgCO_(3) rarr MgO + CO_(2)`
Here there is no change in oxidation numbers.
This decomposition is not a redox reaction.
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AAKASH SERIES-REDOX REACTONS-Questions For Descriptive Answers
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  10. Write the average oxidation number of (a) N in NaN(3), (b) Fe in FeS(2...

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  19. What is the mole coefficient of H(2)SO(4) in the balanced equation. ...

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