Question

Which of the following statement about hydrogen is incorrect ?

• A. Hydrogen never acts as cation in ionic salts
• B. Hydronium ion, ${H_3O^+}$ exists freely in solution
• C. Dihydrogen does not act as a reducing agent
• D. Hydrogen has three isotopes of which tritium is the most common

Answer 1

Answer: (D)

Hydrogen has three isotopes of which tritium is the most common

Answer 2

Hydrogen exist as a hydride ${(H^{-})}$ in ionic salt.
Most abundant form of hydrogen is protium.
Dihydrogen reduces some metal ions in aqueous solution and oxides of metals (less active than iron) into corresponding metals.
${H_2(g) + Pd^{2+} (aq) -> Pd(s) + 2 H^{+} (aq)}$
${yH_2(g) + M_x O_y(s) -> xM(s) + yH_2O(\ell)}$