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| Q. |
Which of the following gases will effuse out of football bladder most wieldy? |
| A. | He |
| B. | H2 |
| C. | N2 |
| D. | 02 |
| Answer» B. H2 | |
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Explanation: Hydrogen is a chemical element with symbol H and atomic number 1. With an average atomic weight of 1.00794 u (1.007825 u for hydrogen-1), hydrogen is the lightest element and its monatomic form (H1) is the most abundant chemical substance, constituting roughly 75% of the Universe's baryonic mass. Naturally occurring atomic hydrogen is rare on Earth because hydrogen readily forms covalent compounds with most elements and is present in the-water molecule and in most organic compounds. |
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