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How many of the following orders are correct with respect to their properties indicated.
i HCl < HF Boiling point
ii $B I_{3} > B F_{3}$ Lewis acidity
iii Graphite<Diamond Density
iv $E_{C r^{+ 6} / C r^{+ 3}}^{o} < E_{C e^{+ 4} / C e^{+ 3}}^{o}$ Standard reduction potential
v $N H_{3} > P H_{3}$ Bond angle

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answer is C.

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Detailed Solution

HCl < HF : Bp

$B F_{3} < B I_{3}$ : Lewis acidity

Graphite < Diamond density

$E_{{Cr}^{+ 6} / {Cr}^{+ 3}}^{o} = 1.33 V$

$E_{C e^{+ 4} / C e^{+ 3}}^{o} = 1.74 V$

$N H_{3} > P H_{3}$

$107 ° 93 °$

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