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Which of the following properties of hydrogen is incorrect ?

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Like halogens hydrogen exists as a diatomic gas.

Like halogens, hydrogen exhibits -l oxidation state in its compounds with metals

Like halogens, hydrogen is liberated at cathode.

The ionisation energy of hydrogen is quite close to halogens.

answer is C.

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Detailed Solution

Halogens are liberated at anode.
$X^{-} (g) ⟶ \frac{1}{2} X_{2} (g) + e^{-}$
Hydrogen is liberated at cathode.
$2 H^{+} (g) + 2 e^{-} ⟶ H_{2} (g)$

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