Which of the following reactions is an example of use of water gas in the synthesis of other compounds?

(i) CH₄(g) + H₂O(g) → CO(g) + H₂(g)

(ii) CO(g) + H₂O(g) → CO₂(g) + H₂(g)

(iii) C_nH_2n+2 + nH₂O(g) → nCO + (2n+1)H₂

(iv) CO(g)+2H₂(g) → CH₃OH(l)

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