Page 1 - Microsoft Word - Home assignment-S Block Elements
P. 1
S – BLOCK ELEMENTS
Q1. Explain why sodium is less reactive than potassium?
Q2. Why are potassium and caesium, rather than lithium used in
photoelectric cells?
Q3. Be and Mg don’t give colour to flame where as other alkaline
earth metals do so. Why?
Q4. When an alkali metal dissolves in liquid ammonia, the solution
can acquire different colours. Explain the reasons for this type of
colour change.
Q5. Potassium carbonate can’t be prepared by Solvay process.
Q6. Why is Li2CO3 decomposed at a lower temperature where as
Na2CO3 at higher temperature?
Q7. Draw the structure of BeCl 2 in vapour state.
Q8. Draw the structure of BeCl2 in solid state.
Q9. Why are lithium salts commonly hydrated and those of the other
alkali metal ions usually anhydrous?
Q10. Why is KO 2 paramagnetic?
Q11. Why is LiI more soluble in ethanol than KI?
Q12. What is the oxidation state of K and O in KO2?
Q13. Write the balanced reaction between Na 2O2 and water?
Q14. Give chemical formula of plaster of Paris and gypsum.
Q15. Why does the solubility of alkaline earth metal hydroxides in
water increases down the group?
