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Payal posted an Question

January 23, 2021 • 04:53 am

30 points

IIT JAM
Chemistry (CY)

Q1. arrange the following in the increasing order of bond angle nh3 nf3 oh nh

Q1. Arrange the following in the increasing order of bond angle NH3 NF3 OH NH

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Priyanshu kumar Best Answer

Bond angle order NH4+> H30+> NH3>NF3 Explanation:- Lone pairs causes distortion..In case of NH4+ there is no pair and hybridiastion is sp3 so it has regular tetrahedral shape and bond angle is 109°28'. In case of NH3 and NF3, check the EN of surrounding atoms.More is the EN of surrounding atoms ,less is the Bond Angle. EN of F>H so NH3 >NF3. In between H30+ and NH3 as electronegativity of oxygen is more than nitrogen...and more is the electronegativity of central atom,more repulsion it cause and hence more is the bond angle. So H30+>NH3
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Dinesh khalmaniya 1

NH4+>H3O+> NH3> NF3 Explanation- Here All the species have same type of hybridisation i.e., sp3. so it it not a deciding factor further we will check no. of lp more the lp more is the lp-bp repulsion and less will be the Bond angle. Among these - NH3, NF3 and H3O+ have 1 lp so less BA. NH4+ have no lp. So NH4+ has maximum bond angle. in case of NH3 and NF3, we will check the EN of surrounding atoms. more the EN of surrounding atoms more less is the Bond Angle. F is more EN than H so NH3 >NF3. Overall BA-- NF3 < NH3 < H3O+ < NH4+
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got it Payal?
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yes sir. Thank you
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Amol ashok pawar

H3O+ = 109.5 NH4+ =109.28 NH3 =107 NF3=101.9
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Suman Kumar

NH4+ will have maximum bond angle. Pure tetrahedral angle NH4+>H3O+> NH3> NF3
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sir
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why H3O+>NH3?
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As the electronegativity of central atom increases bond angle increases
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