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Q.87) Identify the correct orders against the property mentioned

A. $\mathrm{H}_2 \mathrm{O}>\mathrm{NH}_3>\mathrm{CHCl}_3$ - dipole moment 

B. $\mathrm{XeF}_4>\mathrm{XeO}_3>\mathrm{XeF}_2$ - number of lone pairs on central atom

C. $\mathrm{O}-\mathrm{H}>\mathrm{C}-\mathrm{H}>\mathrm{N}-\mathrm{O}$ - bond length

D. $\mathrm{N}_2>\mathrm{O}_2>\mathrm{H}_2$ - bond enthalpy

Choose the correct answer from the options given below :

A) B, C only 

B) A, D only

C) B, D only

D) A, C only

 

Answers (1)

best_answer

Q.87) $\mathrm{H}_2 \mathrm{O}>\mathrm{NH}_3>\mathrm{CHCl}_3$ - Dipole Moment
- Dipole moments (approximate):
- $\mathrm{H}_2 \mathrm{O} \approx 1.85 \mathrm{D}$
- $\mathrm{NH}_3 \approx 1.47 \mathrm{D}$
- $\mathrm{CHCl}_3 \approx 1.01 \mathrm{D}$
The correct order, so A is correct.

$\mathrm{N}_2>\mathrm{O}_2>\mathrm{H}_2-$ Bond enthalpy

Approximate bond enthalpies:
- $\mathrm{N} \equiv \mathrm{N} \approx 941 \mathrm{~kJ} / \mathrm{mol}$
- $\mathrm{O}=\mathrm{O} \approx 498 \mathrm{~kJ} / \mathrm{mol}$
- $\mathrm{H}-\mathrm{H} \approx 436 \mathrm{~kJ} / \mathrm{mol}$
The correct order, so D is correct

Hence, the correct answer is option (2).

 

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