Q.1.
Name the factors responsible for anomalous behaviour of
lithium.
Q.2. Name the alkali metals which form superoxides when heated in excess of air.
Q.3. Name the metal which floats on water without any apparent reaction with it.
Q.4. Predict giving reason, the outcome of the reaction:
LiI + KF →
Q.5. Why does the following reaction:
proceed better with KF than with NaF.
Q.6. What compounds are formed when Li and Na combine with oxygen. Give the hydrolysis reactions of compounds formed.
Q.7. Why is LiF almost insoluble in water whereas LiCl is soluble not only in water but is also in acetone?
Q.8. Why are alkali metals not found free in nature ?
Q.9. Why can cesium be used in photoelectric cell but lithium cannot?
Q.10. Complete the following reactions:
(i) O22– + H2O →
(ii) O2– + H2O →
Q.11. Can potassium carbonate like sodium carbonate be prepared by Solvay process? Explain.
Q.12. An aqueous solution of sodium carbonate gives alkaline tests. Why ?
Q.13. Why is Li2CO3 decomposed at lower temperature whereas Na2CO3 at higher temperature?
Q.14. LiH, LiF and Li3N show exceptional thermal stabilities. Explain.
Q.15. Which out of Li or Na has greater value for the following properties:
(i) Hydration enthalpy
(ii) Stability of hydride
(iii) Stability of carbonate
(iv) Basic character of hydroxide
(v) Ionisation enthalpy
Q.16. Which out of the following and why can be used to store an alkali metal ?
H2O, C2H5OH, Benzene
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