Page 2 - Microsoft Word - Home assignment-Hydrogen
P. 2
Q19. Why ice floats on water?
Q20. Why HF is a liquid but HCl is a gas?
Q21. Why H2O has higher boiling point than H2S?
Q22. Why is H 2O 2 stored in wax lined bottle?
Q23. Why does hard water not form lather with soap?
Q24. Write redox reactions between F2 and water.
Q25. What is auto-protolysis of water? What is its significance?
Q26. What is a fuel cell?
Q27. What is the difference between hydrolysis and hydration?
Q28. Consider the reaction of H2O with F2. Suggest in terms of
oxidation and reduction, which species are oxidised and reduced?
Q29. Complete the following reactions.
(i)PbS + H2O2 →
(ii)CaC2 + 2H2O →
(iii)Zn + NaOH →
(iv)CO + H 2 →
(v)C3H8 + 3H2O heat / catalyst
Q30. Arrange the following in the increasing order of properties.
(i)CaH2, BeH2, TiH2 (electrical conductance)
(ii)LiH, NaH, CsH (Ionic nature)
(iii)NaH, MgH2, H2O (reducing properties)
(iv)H-H, D-D, F-F (bond dissociation enthalpy)
