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| Q. |
Which one out of the following helps in burning? |
| A. | carbon dioxide |
| B. | oxygen |
| C. | carbon monoxide |
| D. | nitrogen |
| Answer» B. oxygen | |
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Explanation: Oxygen is the gas that helps / supports combustion (burning). Nitrogen itself does not support burning (though it forms nitrides with some metals). So, air also supports burning. |
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