Chapter 10 - The s-Block Elements

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  • Chapter 10 - The s-Block Elements Assignments 1

    Ions of an element of group 1 participate in the transmission of nerve signals
    and transport of sugars and aminoacids into cells. This element imparts yellow
    colour to the flame in flame test and forms an oxide and a peroxide with
    oxygen. Identify the element and write chemical reaction to show the formation
    of its peroxide. Why does the element impart colour to the flame?

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  • Chapter 10 - The s-Block Elements Assignments 2

    An element of group 2 forms covalent oxide which is amphoteric in nature
    and dissolves in water to give an amphoteric hydroxide. Identify the element
    and write chemical reactions of the hydroxide of the element with an alkali
    and an acid.

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  • Chapter 10 - The s-Block Elements Assignments 3

    Lithium hydride can be used to prepare other useful hydrides. Beryllium
    hydride is one of them. Suggest a route for the preparation of beryllium hydride
    starting from lithium hydride. Write chemical equations involved in the process.

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  • Chapter 10 - The s-Block Elements Assignments 4

    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.

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  • Chapter 10 - The s-Block Elements Assignments 5

    Assertion (A): Beryllium carbonate is kept in the atmosphere of carbon
    dioxide.
    Reason (R) : Beryllium carbonate is unstable and decomposes to give
    beryllium oxide and carbon dioxide.
    (i) Both A and R are correct and R is the correct explanation of A.
    (ii) Both A and R are correct but R is not the correct explanation of A.
    (iii) Both A and R are not correct.
    (iv) A is not correct but R is correct.

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  • Chapter 10 - The s-Block Elements Assignments 6

    Match the elements given in Column I with the colour they impart to the
    flame given in Column II.
    Column I Column II
    (i) Cs (a) Apple green
    (ii) Na (b) Violet
    (iii) K (c) Brick red
    (iv) Ca (d) Yellow
    (v) Sr (e) Crimson red
    (vi) Ba (f) Blue

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  • Chapter 10 - The s-Block Elements Assignments 7

    Show with an example that Ca O is a basic oxide?

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  • Chapter 10 - The s-Block Elements Assignments 8

    What happens when CaCO3 is subjected to heat?

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  • Chapter 10 - The s-Block Elements Assignments 9

    What is milk of lime?

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  • Chapter 10 - The s-Block Elements Assignments 10

    Mention the natural sources of calcium carbonate.

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  • Chapter 10 - The s-Block Elements Assignments 11

    What is the formulae of caustic potash?

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  • Chapter 10 - The s-Block Elements Assignments 12

    Anhydrous calcium sulphate can not be used as plaster of Paris. Give reason.

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  • Chapter 10 - The s-Block Elements Assignments 13

    What happens when gypsum is heated to 390K?

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  • Chapter 10 - The s-Block Elements Assignments 14

    What is quick lime? What happens when we add water to it?

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  • Chapter 10 - The s-Block Elements Assignments 15

    Give two uses of
    (i) caustic soda
    (ii) quick lime

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  • Chapter 10 - The s-Block Elements Assignments 16

    Mention the main compounds which constitute Portland cement.

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  • Chapter 10 - The s-Block Elements Assignments 17

    Beryllium is reducing in nature. Why?

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  • Chapter 10 - The s-Block Elements Assignments 18

    Give the reaction of magnesium with air?

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  • Chapter 10 - The s-Block Elements Assignments 19

    Why beryllium is not attacked by an acid easily?

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  • Chapter 10 - The s-Block Elements Assignments 20

    Why does the solubility of alkaline earth metal hydroxides in water increase
    down the group?

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  • Chapter 10 - The s-Block Elements Assignments 21

    Why sulphates of Mg and Be soluble in water?

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  • Chapter 10 - The s-Block Elements Assignments 22

    Name the metal amongst alkaline earth metals whose salt do not impart
    colour to a non – luminous flame.

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  • Chapter 10 - The s-Block Elements Assignments 23

    Why is beryllium carbonate unusually unstable thermally as compared to the
    other carbonates of this group?

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  • Chapter 10 - The s-Block Elements Assignments 24

    Why is Calcium preferred over sodium to remove last traces of moisture from
    alcohol?

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  • Chapter 10 - The s-Block Elements Assignments 25

    Why does beryllium show similarities with Al?

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  • Chapter 10 - The s-Block Elements Assignments 26

    What is the nature of oxide formed by Be?

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  • Chapter 10 - The s-Block Elements Assignments 27

    The alkaline earth metals are called s – block elements. Give reasons.

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  • Chapter 10 - The s-Block Elements Assignments 28

    Which member of the alkaline earth metals family has:
    (i) least reactivity (ii) lowest density (iii) highest boiling point
    (iv) maximum reduction potential

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  • Chapter 10 - The s-Block Elements Assignments 29

    The melting and boiling points of alkaline metals are higher than alkali metals.
    Give reason.

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  • Chapter 10 - The s-Block Elements Assignments 30

    Compounds of alkaline earth metals are more extensively hydrated than those
    of alkali metals. Give reason.

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  • Chapter 10 - The s-Block Elements Assignments 31

    Name the metal amongst alkaline earth metals whose salt do not impart colour
    to a non-luminous flame.

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  • Chapter 10 - The s-Block Elements Assignments 32

    State one reason for alkaline earth metals in general having a greater tendency
    to form complexes than alkali metals.

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  • Chapter 10 - The s-Block Elements Assignments 33

    The second ionization enthalpy of calcium is more than the first. How is that

    calcium forms CaCl2 and not CaCl give reasons.

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  • Chapter 10 - The s-Block Elements Assignments 34

    Why do alkaline earth metals have low ionization enthalpy?

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  • Chapter 10 - The s-Block Elements Assignments 35

    The atomic radii of alkaline earth metals are smaller than those of the
    corresponding alkali metals. Explain why?

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  • Chapter 10 - The s-Block Elements Assignments 36

    Name the elements present in Group 2

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  • Chapter 10 - The s-Block Elements Assignments 37

    Solution of Na2 CO3 is alkaline. Give reason.

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  • Chapter 10 - The s-Block Elements Assignments 38

    Give two uses of sodium carbonate?

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  • Chapter 10 - The s-Block Elements Assignments 39

    What is the formula of soda ash?

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  • Chapter 10 - The s-Block Elements Assignments 40

    Which compound of sodium is used:
    (i) as a component of baking powder.
    (ii) for softening hard water.

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  • Chapter 10 - The s-Block Elements Assignments 41

    What is the difference between baking soda and baking powder?

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  • Chapter 10 - The s-Block Elements Assignments 42

    Why does table salt get wet in rainy season?

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  • Chapter 10 - The s-Block Elements Assignments 43

    Why is sodium hydrogen carbonate known as baking powder?

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  • Chapter 10 - The s-Block Elements Assignments 44

    What is sodium amalgam?

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  • Chapter 10 - The s-Block Elements Assignments 45

    Give the important uses of sodium carbonate.

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  • Chapter 10 - The s-Block Elements Assignments 46

    How is sodium carbonate prepared?

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  • Chapter 10 - The s-Block Elements Assignments 47

    Why metals like potassium and sodium can not be extracted by reduction of
    their oxides by carbon?

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  • Chapter 10 - The s-Block Elements Assignments 48

    Lithium shows similarities with magnesium in its chemical behavior. What is
    the cause of these similarities?

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  • Chapter 10 - The s-Block Elements Assignments 49

    Write a reaction to show that bigger cat ions stabilize bigger anions.

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  • Chapter 10 - The s-Block Elements Assignments 50

    Name the alkali metals that form super oxides when heated in excess of air.

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  • Chapter 10 - The s-Block Elements Assignments 51

    Why are lithium compounds soluble in organic solvents?

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  • Chapter 10 - The s-Block Elements Assignments 52

    Name the anomalous properties of lithium

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  • Chapter 10 - The s-Block Elements Assignments 53

    Why are peroxides and super oxides stable in comparison to other oxides?

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  • Chapter 10 - The s-Block Elements Assignments 54

    Why alkali metal hydroxides are make the strongest bases?

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  • Chapter 10 - The s-Block Elements Assignments 55

    Name the lightest metal.

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  • Chapter 10 - The s-Block Elements Assignments 56

    Why is potassium lighter than sodium?

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  • Chapter 10 - The s-Block Elements Assignments 57

    What type of oxide is made by sodium?

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  • Chapter 10 - The s-Block Elements Assignments 58

    Why do alkali metals and salts impart color to an oxidizing flame?

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  • Chapter 10 - The s-Block Elements Assignments 59

    What makes lithium show properties different from rest of the alkali metals?

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  • Chapter 10 - The s-Block Elements Assignments 60

    Why are lithium halides covalent in nature?

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  • Chapter 10 - The s-Block Elements Assignments 61

    Why is lithium kept under kerosene oil?

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  • Chapter 10 - The s-Block Elements Assignments 62

    Why is lithium kept under kerosene oil?

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  • Chapter 10 - The s-Block Elements Assignments 63

    What do you mean by diagonal relationship in the periodic table?

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  • Chapter 10 - The s-Block Elements Assignments 64

    Why are melting and boiling points of alkali metals low?

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  • Chapter 10 - The s-Block Elements Assignments 65

    Why is lithium salts mostly hydrated?

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  • Chapter 10 - The s-Block Elements Assignments 66

    Why is Group I elements known as the most electropositive element?

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  • Chapter 10 - The s-Block Elements Assignments 67

    Which one of the alkaline earth metal carbonates is thermally the most stable?

    (a) MgCO3 (b) CaCO3 (c) SrCO3 (d) BaCO3

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  • Chapter 10 - The s-Block Elements Assignments 68

    Which one of the following alkali metals gives hydrated salts?

    (a) Li (b) Na (c) K (d) Cs

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  • Chapter 10 - The s-Block Elements Assignments 69

    Which of the alkali metal is having least melting point?

    (a) Na (b) K (c) Rb (d) Cs

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  • Chapter 10 - The s-Block Elements Assignments 70

    How would you explain the following observations?

    (i) BeO is almost insoluble but BeSO4 in soluble in water,

    (ii) BaO is soluble but BaSO4 is insoluble in water,

    (iii) LiI is more soluble than KI in ethanol.

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  • Chapter 10 - The s-Block Elements Assignments 71

    How would you explain the following observations?

    (i) BeO is almost insoluble but BeSO4 in soluble in water,

    (ii) BaO is soluble but BaSO4 is insoluble in water,

    (iii) LiI is more soluble than KI in ethanol.

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  • Chapter 10 - The s-Block Elements Assignments 72

    Write balanced equations for reactions between

    (a) Na2O2and water

    (b) KO2 and water

    (c) Na2O and CO2

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  • Chapter 10 - The s-Block Elements Assignments 73

    State as to why

    (a) a solution of Na2CO3 is alkaline ?

    (b) alkali metals are prepared by electrolysis of their fused chlorides ?

    (c) sodium is found to be more useful than potassium ?

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  • Chapter 10 - The s-Block Elements Assignments 74

     

    State as to why

    (a) a solution of Na2CO3 is alkaline ?

    (b) alkali metals are prepared by electrolysis of their fused chlorides ?

    (c) sodium is found to be more useful than potassium ?

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  • Chapter 10 - The s-Block Elements Assignments 75

    Comment on each of the following observations:

    (a) The mobilities of the alkali metal ions in aqueous solution are Li+< Na+< K+ < Rb+ < Cs+

    (b) Lithium is the only alkali metal to form a nitride directly.

    (c)

     (where M = Ca, Sr or Ba) is nearly constant.

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  • Chapter 10 - The s-Block Elements Assignments 76

    What happens when

    (i) sodium metal is dropped in water ?

    (ii) sodium metal is heated in free supply of air ?

    (iii) sodium peroxide dissolves in water ?

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  • Chapter 10 - The s-Block Elements Assignments 77

    Explain the significance of sodium, potassium, magnesium and calcium inbiological fluids.

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  • Chapter 10 - The s-Block Elements Assignments 78

    Why is LiF almost insoluble in water whereas LiCl soluble not only in water but also in acetone?

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  • Chapter 10 - The s-Block Elements Assignments 79

    Why are lithium salts commonly hydrated and those of the other alkali metal ions usually anhydrous?

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  • Chapter 10 - The s-Block Elements Assignments 80

    Describe the importance of the following: (i) limestone (ii) cement (iii) plaster of paris.

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  • Chapter 10 - The s-Block Elements Assignments 81

    The hydroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly soluble in water. Explain.

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  • Chapter 10 - The s-Block Elements Assignments 82

    Draw the structure of (i) BeCl2 (vapour) (ii) BeCl2 (solid).

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  • Chapter 10 - The s-Block Elements Assignments 83

    Describe two important uses of each of the following: (i) caustic soda (ii) sodium carbonate (iii) quicklime.

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  • Chapter 10 - The s-Block Elements Assignments 84

    What happens when (i) magnesium is burnt in air (ii) quick lime is heated with silica (iii) chlorine reacts with slaked lime (iv) calcium nitrate is heated ?

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  • Chapter 10 - The s-Block Elements Assignments 85

    Starting with sodium chloride how would you proceed to prepare (i) sodium metal (ii) sodium hydroxide (iii) sodium peroxide (iv) sodium carbonate?

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  • Chapter 10 - The s-Block Elements Assignments 86

    Compare the solubility and thermal stability of the following compounds of the alkali metals with those of the alkaline earth metals. (a) Nitrates (b) Carbonates (c) Sulphates.

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  • Chapter 10 - The s-Block Elements Assignments 87

    Find the oxidation state of sodium in Na2O2.

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  • Chapter 10 - The s-Block Elements Assignments 88

    Why are alkali metals not found in nature?

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  • Chapter 10 - The s-Block Elements Assignments 89

    Discuss the general characteristics and gradation in properties of alkaline earth metals.

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  • Chapter 10 - The s-Block Elements Assignments 90

    What are the common physical and chemical features of alkali metals?

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  • Chapter 10 - The s-Block Elements Assignments 91

    Why is Li2CO3 decomposed at a lower temperature whereas Na2CO3 at higher temperature?

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  • Chapter 10 - The s-Block Elements Assignments 92

    Potassium carbonate cannot be prepared by Solvay process. Why?

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  • Chapter 10 - The s-Block Elements Assignments 93

    Discuss the various reactions that occur in the Solvay process.

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  • Chapter 10 - The s-Block Elements Assignments 94

    Beryllium and magnesium do not give colour to flame whereas other alkaline earth metals do so. Why?

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  • Chapter 10 - The s-Block Elements Assignments 95

    When an alkali metal dissolves in liquid ammonia the solution can acquire different colours. Explain the reasons for this type of colour change.

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  • Chapter 10 - The s-Block Elements Assignments 96

    Why are potassium and cesium, rather than lithium used in photoelectric cells?

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  • Chapter 10 - The s-Block Elements Assignments 97

    Explain why alkali and alkaline earth metals cannot be obtained by chemical reduction methods?

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  • Chapter 10 - The s-Block Elements Assignments 98

    In what ways lithium shows similarities to magnesium in its chemical behaviour?

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  • Chapter 10 - The s-Block Elements Assignments 99

    Compare the alkali metals and alkaline earth metals with respect to (i) ionization enthalpy (ii) basicity of oxides and (iii) solubility of hydroxides.

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  • Chapter 10 - The s-Block Elements Assignments 100

    Explain why is sodium less reactive than potassium?

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