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Chemistry Question on Hydrogen Bonding

Which of the following statement about hydrogen is incorrect ?

A

Hydrogen never acts as cation in ionic salts

B

Hydronium ion, \ceH3O+\ce{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

Hydrogen has three isotopes of which tritium is the most common

Explanation

Solution

Hydrogen exist as a hydride (H−) {(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. H2(g)+Pd2+(aq)−>Pd(s)+2H+(aq) {H_2(g) + Pd^{2+} (aq) -> Pd(s) + 2 H^{+} (aq)} yH2(g)+MxOy(s)−>xM(s)+yH2O(ℓ) {yH_2(g) + M_x O_y(s) -> xM(s) + yH_2O(\ell)}