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Standard XI
Chemistry
Thermal Energy and Intermolecular Forces
Question

Which of the following interaction lies in the range of 8 - 42 kJ/mol ?

A
$$H_2 ....... H_2O$$
B
$$F^- ..... HF$$
C
$$HCl ..... HCl$$
D
$$HCN ...... NH_3$$
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Solution
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Correct option is D. $$HCN ...... NH_3$$
(a) $$H_2 ....... H_2O$$ Dipole-induced dipole interaction (van der Waals' force) energy < 8 kJ/mol
(b)$$HCl ..... HCl$$ Dipole-dipole interaction (van der Waals' force) < 8 kJ/mol
(c) $$F^- ..... HF$$ Ion-dipole H-bond (very strong H-bond energy) > 42 kJ/mol
(d) $$HCN ...... NH_3$$ H-bond energy ranges from 8-42 kJ/mol

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Q3
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