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STD 11 - 4. Chemical bonding and molecular structure — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 4. Chemical bonding and molecular structure4 Marks
MCQ
Which bond angle $\theta $ would result in the maximum dipole moment for the triatomic molecule $YXY$
  • ✓
    $\theta = {90^o}$
  • B
    $\theta = {120^o}$
  • C
    $\theta = {150^o}$
  • D
    $\theta = {180^o}$
✓

Answer

Correct option: A.
$\theta = {90^o}$
(a) The dipole moment of two dipoles inclined at an angle $\theta $ is given by the equation $\mu = \sqrt {{X^2} + {Y^2} + 2XY\cos \theta } $

$\cos 90^o = 0$. Since the angle increases from $90 - 180$, the value of $\cos \theta $ becomes more and more $-ve$ and hence resultant decreases. Thus, dipole moment is maximum when $\theta = 90^o $.

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(Oxoacids of Phosphorus)		List-ll
(Bonds of Phosphorus)
(A) Hypophosphorus Acid(I) Two P-OH
One P-H
One P = 0
(B) Orthophosphorus Acid(II) Four P-OH
Two P = 0
One P-P
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Two P-H
One P = 0
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