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CBSE Class 10 Answered

It is given in textbook that:               Metal+ water = metal oxide+hydrogen .            But in the following reaction : magnesium+ water gives magnesium hydroxide+hydrogen gas  i•e                 metal + water =metal hydroxide + hydrogen.                                                                   So what  is produced exactly metal oxide or metal hydroxide??
Asked by guptaabhinav0809 | 19 Aug, 2018, 06:02: PM
answered-by-expert Expert Answer
The product oxide or hydroxide depends upon the reactivity of metals and the state of water like cold, hot or steam.
 
More reactive metals like sodium and magnesium react with water to form hydroxide because in solutions their hydroxides are more stable.
 
While metals with lower reactivity like iron react only with steam to first they produce hydroxide but it's not thermally stable hence breaks down into iron oxide and water.
 
Answered by Ramandeep | 20 Aug, 2018, 02:35: PM

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