KVPY SX SB Exam 2018 Question Paper

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Question : 47 of 120

Marks: +1, -0

Among the following species, the H–X–H angle (X = B, N or P) follows the order

$PH_3 < NH_3 < NH_4^{+}< BF_3$
$NH_3 < PH_3 < NH_4^{+} < BF_3$
$BF_3 < PH_3 < NH_4^{+} < NH_3$
$BF_3 < NH_4^{+} < NH_3 < PH_3$

Solution:

Molecule	Bond angle
$PH 3$	90º
$NH_3$	107º
$NH_4^{+}$	109º. 28 min.
$BF_3$	120º

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