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Building Materials - Section 6 :: Discussion
| 23. | Pick up the correct statement from the following: | |
| A. | Rusting is caused due to combined action of air, moisture and carbon dioxide | |
| B. | During rusting, first ferrous bicarbonates are formed | |
| C. | On further oxidation ferrous bicarbonates get converted to ferric bicarbonates | |
| D. | All the above. | |
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