Which of the following properties of hydrogen is incorrect?

Like halogens, hydrogen exists as a diatomic gas

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Like halogens, hydrogen exhibits - 1 oxidation state in its compounds with metals

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Like halogens, hydrogen is liberated at cathode

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The ionization energy of hydrogen is quite close to halogens

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Solution

The correct option is C Like halogens, hydrogen is liberated at cathode
Like halogens, hydrogen is liberated at anode, e.g.
2NaH $\to 2 N a + H_{2}$ (at anode
2NaCl $\to 2 N a + c l_{2}$ (at anode)

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