What is the significance of enthalpy of fusion? from Chemistry

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 Multiple Choice QuestionsShort Answer Type

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71.

What is the significance of enthalpy of fusion?


It gives an idea about the strength of the forces acting on a solid. Thus, ionic solids like NaCl, MgCl2 etc. have a high enthalpy of fusion, molecular solids like O2, CCl4, H2S etc. have a low enthalpy of fusion.
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72.

What is the significance of enthalpy of combustion?

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73.

Under what conditions, the heat absorbed by the system is equal to the work done by the system?

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74.

State Hess's law of constant heat summation.

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75.

What is calorific value?

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76.

The heat of combustion of glucose (C6H12,O6) is 2840 kJ mol–1. What is its calorific value?

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77.

Define bond enthalpy.

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78.

Is the bond enthalpy of all the four C – H bonds in CH4 molecule equal ? If not, then why ? How is the C – H bond energy then reported ?

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79.

What are renewable sources of energy?

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80.

When does bond enthalpy become equal to bond dissociation enthalpy?

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