Question

In which of the properties listed below, hydrogen does not show similarity with halogens ?
I. Nature of the oxide
II. Electropositive character
III. Combination with alkali metals
IV. Atomicity

• A. I and II
• B. III and IV
• C. II only
• D. I and III

Answer 1

The correct option is A I and II

Hydrogen forms a neutral oxide, i.e., $H_{2}O$ (water) while the oxides of halogens are acidic. Hydrogen shows electropositive nature also while halogens are mostly electronegative in nature.


Hydrogen also resembles halogens:
1. It is also diatomic $H_2$
2. It also forms uninegative ion $H^{-}$
3. H is one electron short of duplet. $H^{-}$ has a stable inert gas (He) configuration
4. I.E. of H is very high
($1312kJmo{l}^{-1}$), which is of the same order as that of the halogens.