Q.1. What is Epsom salt? What is the action of heat on it?
Q.2. Mg2+ is much hydrated than Na+. Why?
Q.3. BeCl2 can be easily hydrolysed. Explain.
Q.4. An element of group 2 forms covalent oxide which is amphoteric in nature and dissolves in water to give an amphoteric hydroxide. Name the element.
Q.5. Arrange the alkaline earth metal carbonates in the decreasing order of thermal stability.
Q.6. The enthalpy of formation of hypothetical CaCl(s) theoretically found to be –188 kJ mol–1 and ∆fHo for CaCl2 (s) is –795 kJ mol–1. Calculate ∆fHo for the disproportion reaction:
2CaCl(s) → CaCl2 (s) + Ca (s)
Q.7. Which of the two: MgCO3 or CaCO3 is more stable?
Q.8. Arrange the following in the decreasing order of the property mentioned:
(i) Li+, Na+, K+, Rb+ (Ionic mobility)
(ii) Be, Mg, Ca, Sr (Melting point)
(iii) BeO, MgO, CaO (Enthalpy of formation)
(iv) Be, Mg, Ca (Metallic radius)
Q.9. Name an element of group 2 which forms an amphoteric oxide and water-soluble sulphate. To which period, does it belong?
Q.10. Name one reagent or one operation to distinguish between:
(i) BeSO4 and BaSO4
(ii) Be(OH)2 and Ba(OH)2
Q.11. Complete the following equations for the reaction:
(i) Ca + H2O →
(ii) Ca(OH)2 + Cl2 →
(iii) BeO + NaOH →
(iv) BaO2 +H2SO4 →
Q.12. Why does the solubility of alkaline earth metal carbonates and sulphates decrease down the group?
Q.13. Why does solubility of alkaline earth metal hydroxides increase down the group?
Q.14. When water is added to compound (A) of calcium, solution of compound (B) is formed. When carbon dioxide is passed into the solution, it turns milky due to the formation of compound (C). If excess of carbon dioxide is passed into the solution milkiness disappears due to the formation of compound (D). Identify the compounds A, B, C and D. Explain why the milkiness disappears in the last step.
Q.15. Mg2+ is much more heavily hydrated than Na+, Why?
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