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I.High purity dihydrogen is obtained electrolyzing warm aqueous Ba (OH)₂ solution with Ni electrodes.
II. LiH is unreactive with O₂ at moderate temperature.
III. Dipole moment of HF is more than H₂O due to more electronegativity of fluorine.
IV. O – H bond length is more in solid H₂O₂ than gas phase H₂O₂ .
Correct statements are

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I, II ,III only

I, II, III, IV only

I,II,IV only

I , II only

answer is C.

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Detailed Solution

$μ_{HF} = 1 .91 D μ_{H_{2} O} = 1 .84 D$
Due to high lattice energy,LiH is unreactive to O₂ and air
O – H bond length of H₂O₂ in solid phase is 98.8 pm, liquid phase is 95 pm

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