Compare hydrogen and halogen on the basis of -
(i) Physical state
(ii) Ion formation
(iii) Valency
(iv) Reaction with oxygen

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Solution

Compare hydrogen and halogen
Properties Hydrogen Halogen
1.Physical state Hydrogen is present in gaseous state. Halogens are present in gaseous state.
2. Ion formation Hydrogen forms both cation and anion by gaining or losing 1 electron from valence shell. Halogens form anion by accepting 1 electron in the valence shell.
3. Valency Hydrogen is monovalent. Valency = 1 Halogens are also monovalent. Valency = 1
4. Reaction with oxygen Hydrogen forms oxide that reacts with oxygen that is neutral in nature. Halogens form oxides that react with oxygen that are acidic in nature.

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Properties	Hydrogen	Halogen
1.Physical state	Hydrogen is present in gaseous state.	Halogens are present in gaseous state.
2. Ion formation	Hydrogen forms both cation and anion by gaining or losing 1 electron from valence shell.	Halogens form anion by accepting 1 electron in the valence shell.
3. Valency	Hydrogen is monovalent. Valency = 1	Halogens are also monovalent. Valency = 1
4. Reaction with oxygen	Hydrogen forms oxide that reacts with oxygen that is neutral in nature.	Halogens form oxides that react with oxygen that are acidic in nature.