Which of the following hydrides is electron-precise hydride?

(i) B₂H₆

(ii) NH₃

(iii) H₂O

(iv) CH₄

H₂S has minimum boiling point.

PbS + 4H₂O_2->PbSO₄ + 4H₂O.

Volume strength of H₂O₂ = Molarity * 11.2

HF molecules are associated with strong intermolecular hydrogen bonding hence its boiling point is the highest

Compound             Melting Point (K)

HF                          190

HCl