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प्रश्न
Give reasons Thermal stability decreases from H2O to H2Te.
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उत्तर
The themal stability of hydrides of group 16 decreases as we move down the group i.e. H2O to H2Te. This is because on moving down the group, the size of the atom (attached to the hydrogens in a hydride) increases due to which the bond between hydrogen and the atom attached to it, weakens. Hence, it easily breaks on heating.
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संबंधित प्रश्न
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F2, Cl2, Br2, I2 - increasing bond dissociation enthalpy.
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| Column I | Column II |
| (A) \[\ce{H2SO4}\] | (1) Highest electron gain enthalpy |
| (B) \[\ce{CCl3NO2}\] | (2) Chalcogen |
| (C) \[\ce{Cl2}\] | (3) Tear gas |
| (D) Sulphur | (4) Storage batteries |
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- Hydration enthalpy
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Statement I: The boiling point of hydrides of Group 16 elements follows the order:
H2O > H2Te > H2Se > H2S
Statement II: On the basis of molecular mass, H2O is expected to have a lower boiling point than the other members of the group but due to the presence of extensive H-bonding in H2O, it has a higher boiling point.
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