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प्रश्न
Atomic hydrogen combines with almost all elements but molecular hydrogen does not. Explain.
उत्तर
Atomic hydrogen is highly reactive, whereas molecular hydrogen is rather inert. Bond dissociation enthalpy determines the chemical behaviour of dihydrogen (and, for that matter, any molecule) to a great extent. For a single bond between two atoms of any element, the \[\ce{H - H}\] bond dissociation enthalpy is the highest. As a result, molecular hydrogen reacts only with a few elements.
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संबंधित प्रश्न
Complete the following reaction:
\[\ce{H_{2(g)} + M_M O_{O(s)} ->[\Delta]}\] ?
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\[\ce{CO_{(g)} + H_{2(g)} ->[\Delta][catalyst]}\] ?
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\[\ce{C3H_{8(g)} + 3H2O_{(g)} ->[\Delta][catalyst]}\]?
Complete the following reaction:
\[\ce{Zn_{(s)} + NaOH_{(aq)} ->[heat]}\]?
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Match Column I with Column II for the given properties/applications mentioned therein.
| Column I | Column II |
| (i) \[\ce{H}\] | (a) Used in the name of perhydrol. |
| (ii) \[\ce{H2}\] | (b) Can be reduced to dihydrogen by \[\ce{NaH}\]. |
| (iii) \[\ce{H2O}\] | (c) Can be used in hydroformylation of olefin. |
| (iv) \[\ce{H2O2}\] | (d) Can be used in cutting and welding. |
How can \[\ce{D2O}\] be prepared from water? Mention the physical properties in which \[\ce{D2O}\] differs from \[\ce{H2O}\]. Give at least three reactions of \[\ce{D2O}\] showing the exchange of hydrogen with deuterium.
Hydrogen readily combines with metals and thus shows its ______.
