Question

Which of the following statements is correct regarding hydrogen?

• A. Hydrogen shows $+1$ and $-1$ oxidation states
• B. Hydrogen is never liberated at anode
• C. Hydrogen has same ionisation enthalpy as that of alkali metals
• D. Hydrogen has same electronegativity as that of halogens

Answer 1

Answer: (A)

Hydrogen has $+1$ oxidation state in compounds with more electronegative elements e.g. $HF$. It has $-1$ oxidation state in compounds with more electropositive compounds like $NaH$.