1 Marks1. Why is Group I elements known as the most electropositive element? [1]2. Why is lithium salts mostly hydrated? [1]3. Why are melting and boiling points of alkali metals low? [1]4. What do you mean by diagonal relationship in the periodic table? [1]5. Why is lithium kept under kerosene oil? [1]6. Name the lightest metal. [1]7. Why alkali metal hydroxides are make the strongest bases? [1]8. Why are peroxides and super oxides stable in comparison to other oxides? [1]9. Name the anomalous properties of lithium. [1]10. Why are lithium compounds soluble in organic solvents? [1]11. How is sodium carbonate prepared? [1]12. What is sodium amalgam? [1]13. Why is sodium hydrogen carbonate known as baking powder? [1]14. Why does table salt get wet in rainy season? [1]15. What is the formula of soda ash? [1]16. Why do alkaline earth metals have low ionization enthalpy? [1]17. State one reason for alkaline earth metals in general having a greater tendency

to form complexes than alkali metals.[1]18. Compounds of alkaline earth metals are more extensively hydrated than those

of alkali metals. Give reason.[1]19. The melting and boiling points of alkaline metals are higher than alkali metals.

Give reason.[1]20. What is the nature of oxide formed by Be? [1]21. Why does beryllium show similarities with Al? [1]22. Why is beryllium carbonate unusually unstable thermally as compared to the

other carbonates of this group?[1]23. Why sulphates of Mg and Be soluble in water? [1]24. Why beryllium is not attacked by an acid easily? [1]25. Mention the main compounds which constitute Portland cement. [1]26. What happens when gypsum is heated to 390K? [1]27. Anhydrous calcium sulphate can not be used as plaster of Paris. Give reason. [1]28. Mention the natural sources of calcium carbonate. [1]29. What is milk of lime? [1]30. What happens when CaCO3 is subjected to heat? [1]31. Show with an example that Ca O is a basic oxide? [1]32.

Chapter No. Subject Topic Class Batch1 Chemistry The S-Block Elements 11 Nucleus

2 Marks1. Why are lithium halides covalent in nature? [2]2. What makes lithium show properties different from rest of the alkali metals? [2]3. Why do alkali metals and salts impart color to an oxidizing flame? [2 ]4. What type of oxide is made by sodium? [2]5. Why is potassium lighter than sodium? [2]6. Name the alkali metals that form super oxides when heated in excess of air. [2]7. Write a reaction to show that bigger cat ions stabilize bigger anions. [2]8. Lithium shows similarities with magnesium in its chemical behavior. What is

the cause of these similarities?[2]9. Why metals like potassium and sodium can not be extracted by reduction of

their oxides by carbon?[2 ]10. Give the important uses of sodium carbonate. [2]11. What is the difference between baking soda and baking powder? [2]12. Which compound of sodium is used:

(i) as a component of baking powder.(ii) for softening hard water.[2]

13. Give two uses of sodium carbonate? [2]14. Solution of Na2 CO3 is alkaline. Give reason. [2]15. Name the elements present in Group 2 [2]16. The atomic radii of alkaline earth metals are smaller than those of the

corresponding alkali metals. Explain why?[2]17. The second ionization enthalpy of calcium is more than the first. How is that

calcium forms CaCl2 and not CaCl give reasons.[2]18. Name the metal amongst alkaline earth metals whose salt do not impart colour

to a non-luminous flame.[2]19. Which member of the alkaline earth metals family has:

(i) least reactivity (ii) lowest density (iii) highest boiling point(iv) maximum reduction potential[2]

20. The alkaline earth metals are called s – block elements. Give reasons. [2]21. Why is Calcium preferred over sodium to remove last traces of moisture from

alcohol?[2]22. Name the metal amongst alkaline earth metals whose salt do not impart

colour to a non – luminous flame.[2]23. Why does the solubility of alkaline earth metal hydroxides in water increase

down the group?[2]24. Give the reaction of magnesium with air? [2]

25. Beryllium is reducing in nature. Why? [2]26. Give two uses of

(i) caustic soda(ii) quick lime [2]

27. What is quick lime? What happens when we add water to it? [2]28. What is the formulae of caustic potash? [2]29.

3 Marks1.

5 Marks