Give reasons:a). thermal stability decreases from H2O to H2Te b). flu

1.	Give reasons:a). thermal stability decreases from H2O to H2Te b). fluoride ion has higher hydration enthalpy than chloride ion
Answer» (a) Thermal stability decreases from H₂O to H₂Te. The thermal stability of the hydrides of group 16 elements decreases down the group. This is because M-H bond dissociation energy decreases down the group with the increase in the size of a central atom. (b) The size of halogen decreases down the group, therefore hydration enthalpy decrease.

Give reasons:a). thermal stability decreases from H2O to H2Te b). fluoride ion has higher hydration enthalpy than chloride ion

Answer»

(a) Thermal stability decreases from H₂O to H₂Te. The thermal stability of the hydrides of group 16 elements decreases down the group. This is because M-H bond dissociation energy decreases down the group with the increase in the size of a central atom.

(b) The size of halogen decreases down the group, therefore hydration enthalpy decrease.

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Give reasons:a). thermal stability decreases from H2O to H2Te b). fluoride ion has higher hydration enthalpy than chloride ion

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