MCQOPTIONS
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				| 1. | 
                                    Iron sheet kept in moist air covered with rust. Rust is [CDS] | 
                            
| A. | an element | 
| B. | a compound | 
| C. | a mixture of iron and dust | 
| D. | a mixture of iron, oxygen and water | 
| Answer» C. a mixture of iron and dust | |