S – BLOCK ELEMENTS (ALKALI AND ALKALINE EARTH METALS) – 6

1) The formula of Plaster of Paris is
a)
b)
c)
d)

2) The difference between the number of water molecules in gypsum and plaster of Paris is
a) 5/2
b) 2
c) 1/2
d) 3/2

3) MgCl2.6H2O when heated gives
a) Magnesium oxychloride
b) Magnesium dichloride
c) Magnesium oxide
d) Magnesium chloride

4) Which of the following can be represented by the configuration [Kr]5s2 ?
a) Ca
b) Sr
c) Ba
d) Ra

5) Point out the incorrect statement regarding Be (IIA) group.
a) It forms an ionic carbide
b) Its carbonate decomposes on heating
c) Its halides are covalent
d) It is easily attacked by water

6) Be differs from the rest of the members of its family (II A group) in many ways. The reason for this is its
a) Small size and high electronegativity
b) Small size and low electronegativity
c) Large size and lower ionisation energy
d) Large size and larger ionic radius

7) Point out the wrong statement. In a given period of the periodic table, the s-block element, in general, has a lower value of
a) lonisation energy
b) Electronegativity
c) Atomic radius
d) Electron affinity

8) The chemical formula of gypsum is
a)
b)
c)
d)

9) Limestone is
a) CaO
b)
c)
d)

10) The halides of alkaline earth metals form hydrates such as MgCl2.6H2O, CaCl26H2O, BaCl2. 2H2O and SrCl2.2H2O. This shows that halides of IIA elements
a) Are hygroscopic in nature
b) Acts as dehydrating agent
c) Can absorb moisture from air
d) All of these

11) Which of the following is incorrect ?
a) Mg burns in air releasing a dazzling light rich in UV rays
b)
c) Mg cannot form complexes
d) Be forms complexes due to its very small size

12) The one among the following which does not show variable valency is
a) Ba
b) Ti
c) Cu
d) Pb

13) The electronic configuration of the calcium atom is
a)
b)
c)
d)

14) The electrolysis of KCl.MgCl2.6H2O gives
a) Potassium only
b) Magnesium only
c) Magnesium and chlorine
d) Potassium and magnesium

15) Among the following oxides, the most basic is
a) Zinc oxide
b) Magnesium oxide
c) Aluminium oxide
d) Nitrogen pentoxide

16) Blanc fix used in paints is
a)
b)
c) Suspension of slacked lime
d)

17) A metal is sparingly soluble in water and its carbonate evolves CO2 on heating. The metal is
a) An alkali metal
b) A noble metal
c) An alkaline earth metal
d) Transition metal

18) Which of the following statements is not correct ?
a) Alkaline earth metals are weaker reducing agents than alkali metals because of their comparatively high ionisation energies
b) The reducing nature of alkaline earth metals follows the increasing order as Be < Mg < Ca < Sr < Ba
c) Compounds of IIA group elements are colourless and diamagnetic due to the absence of unpaired electrons
d) All are correct

19) The solubility of sulphates in water decreases from MgSO4 to BaSO4. This is due to the fact that the
a) Ionic nature increases
b)
c) Lattice energy decrease
d)

20) Which of the following is a correct statement ?
a) Gypsum contains a lower percentage of calcium than plaster of Paris
b) Gypsum is obtained by heating plaster of Paris
c) Plaster of Paris can be obtained by hydration of gypsum
d) Plaster of Paris is obtained by partial oxidation of gypsum

21) Among the following.the biggest ion is
a)
b)
c)
d)

22) Which of the following statements is not correct ?
a) The metallic nature of alkaline earth metals increases from Be to Ba
b) The reactivity of alkaline earth metals increases from Be to Ba
c) The reducing nature of these metals increases from Be to Ba
d) All are correct

23) All the following substances react with water. The pair that yields the same gaseous product is
a)
b)
c)
d)

24) Which of the following statements is not correct ?
a) Be and Mg do not impart colour to the flame due to high ionisation energy
b) The m.p. and b.p. of alkaline earth metals are higher than those of alkali metals
c)
d) All are correct

25) The solubility of hydroxides of group IIA increases from Mg(OH)2 to Ba(OH)2 due to the
a) Increase in lattice energy
b) Decrease in lattice energy
c) Increase in I.E
d) Increase in thermal stability

26) Which among the following statements is not correct ?
a)
b)
c)
d) All are correct

27) Alkaline earth metals have standard electrode potential values very similar to those of alkali metals. This is due to
a)
b)
c) Diamagnetic nature
d)

28) Hydrogen may combine directly with
a) Calcium
b) Copper
c) Zinc
d) Iron

29) At high temperature, nitrogen can combine directly with.
a) Fe
b) Zn
c) Mg
d) Cr

30) Which of the following metal ions plays an important role in muscle contraction ?
a)
b)
c)
d)

31) Which of the following is amphoteric ?
a) BeO
b)
c)
d)

32) Which of the following liberates H2 when treated with HNO3 ?
a) Zn
b) Cu
c) Mg
d) Hg

33) The setting of cement is an
a) Endothermic process
b) Exothermic process
c) Neither exothermic nor endothermic
d) None

34) In which of the following pairs is the difference between the covalent radii of the two metals maximum?
a) K, Ca
b) Mn, Fe
c) Co, Ni
d) Cr, Mn

35) On heating quicklime with coke in an electric furnace, we get
a)
b) CaO
c)
d)

36) Calcium chloride and potassium chloride solutions can easily be distinguished from one another by
a) Performing a flame test
b) Comparing their colours
c)
d)

37) Which of the following statement is not correct in the case of alkaline earth metals ?
a)
b)
c)
d) All are correct

38) Which of the following statements regarding alkaline earth metals is not correct ?
a) The solubility of their carbonates decreases down the group because of decrease in hydration energy
b)
c)
d) All are correct

39) Which of the following is the weakest base ?
a)
b)
c) NaOH
d) KOH

40) A scarlet coloured flame test is characteristic of.
a) Sn
b) K
c) Sb
d) Sr

41) Which of the following is the weakest base ?
a)
b) KOH
c) LiOH
d)

42) Which of the following can be used to remove nitrogen from air ?
a) Mg
b) P
c)
d)

43) Magnesium is present in
a) Ascorbic acid
b)
c) Chlorophyll
d) Haemoglobin

44) The calcium salt used as manure is
a)
b)
c)
d)

45) The correct order of increasing lattice energy of the following metallic compounds is
a) NaCl < CaO < Nal < BaO
b) Nal < NaCl < BaO < CaO
c) NaCl< Nal < BaO < CaO
d) Nal < NaCl < CaO < BaO

46) The ionic carbide is
a)
b) ZnC
c) SiC
d) TiC

47) Plaster of Paris in contact with water sets to a hard mass whose composition is
a)
b)
c)
d)

48) The colour given by a salt of calcium to the flame is
a) Green
b) Brick red
c) Violet
d) Crimson red

49) Alkaline earth metals form hydrated crystalline solids such as MgCl2. 6H2O, CaCl2. 6H2O. This is due to their
a) Smaller ionic size
b) Increased charge on ions
c) Higher hydration enthalpies
d) High oxidation potential

50) For military purposes hydrogen is obtained from
a)
b)
c) NaH
d)

51) Alkaline earth metals are not found in the free state in nature because of
a) Their high boiling point
b) Their low boiling point
c) Their thermal instability
d) Their great chemical activity

52) The thermal stability of alkaline earth carbonates increases from Be to Ba because the
a) Covalent nature decreases and ionic nature increases
b) Lattice energy increases
c) Electropositive nature increases
d) None of these

53) When CO2 is passed into Ca(OH)2 solution, a white precipitate is formed due to the formation of
a)
b)
c)
d)

54) Which of the following statements is correct ?
a) Alkali metals are less electropositive than alkaline earth metals
b) The alkaline earth metals are more denser and harder than alkali metals
c) The alkali metals are denser and harder than alkaline earth metals
d) The first IP of alkali metals is more than that of alkaline earth metals

55) Acetylene can be prepared by adding water to
a) Limestone
b) Quick lime
c) Calcium carbide
d) Calcium carbonate

56) Which of the following is the least reactive ?
a) Ca
b) Sr
c) Ba
d) Ra

57) Plaster of Paris is hardened by
a)
b)
c) Uniting with water
d) Giving out water

58) The metal that can be extracted from sea water is
a) Cr
b) Ca
c) Mg
d) All

59) A highly efficient method of obtaining beryllium is by the
a) Reduction of beryllium halide with Mg
b) Reduction of beryllium oxide with carbon
c) Electrolysis of fused beryllium chloride
d) Dissociation of beryllium carbide

60) Which of the following is the least soluble in water ?
a)
b)
c)
d)

61) Metallic magnesium is prepared by
a) Reduction of MgO by coke
b)
c)
d)

62) A mixture of MgCl2 and MgO is called.
a) Portland cement
b) Double salt
c)
d) None

63) Which of the following compounds possesses the greatest degree of covalent character in its bonding ?
a)
b)
c)
d)

64) Which one of the following is most soluble in water ?
a) AgCl
b)
c) AgBr
d)

65) Which of the following alkaline earth metals shows some properties similar to Al ?
a) Be
b) Ca
c) Sr
d) Ba

66) Anhydrous MgCl2 can be prepared by heating MgCl2.2H2O
a) Until it fuses
b) With lime
c) With carbon
d) In a current of dry HCl gas

67) Chemically, the setting of Plaster of Paris is
a) Dehydration
b)
c) Oxidation with atmospheric oxygen
d) Hydration to yield another hydrate

68) The substance commonly used in a laboratory dessicator is
a) NaCl
b)
c)
d) None

69) RRR Portland cement is manufactured by using
a) Limestone, clay, gypsum
b) Limestone, gypsum, alumina
c) Limestone, clay, sand
d) Limestone, gypsum, sand

70) Which of the following metals dissolve in NaOH with the evolution of H2 ?
a) Be
b) Ca
c) Mg
d) Sr

71) The alkaline earth metal that imparts an apple green colour to the Bunsen flame when introduced in the form of its chloride is
a) Ba
b) Ca
c) Mg
d) Sr

72) Among the following groups of oxides, the group containing oxides that cannot be reduced by carbon to give the respective metals is
a)
b)
c)
d)

73) Which of the following is soluble in ether ?
a)
b)
c)
d) None

74) Which of the following is most soluble in water ?
a)
b)
c)
d)

75) When magnesium burns in air, which of the following compounds is formed ?
a)
b) MgS
c)
d)

76) Be2+ has a strong tendency to form covalent bonds in its compounds because of its
a) Low ionic potential
b) High ionic potential
c) Low ionisation energy
d) High ionisation energy

77) A substance absorbs CO2 and violently reacts with water. The substance is
a)
b) CaO
c)
d) ZnO

78) Which of the following is amphoteric ?
a)
b)
c)
d)

79) Which of the following metals does not liberate H2 from boiling NaOH solution?
a) Al
b) Zn
c) Mg
d) Sn

80) The thermal stability of the carbonates decreases in the order
a)
b)
c)
d)

81) Elements of II A group having the electronic configuration ns2 are called alkaline earth elements because
a) They only occur in the earth
b) Their salts form only alkaline solution
c) They all form divalent cations only
d) Their oxides are non fusible like earth matter

82) Which of the following alkaline earth metals is the most abundant in the earths crust ?
a) Mg
b) Ca
c) Sr
d) Ba

83) BeSO4 and MgSO4 are more soluble in water than CaSO4, SrSO4 , BaSO4 . This is due to the
a)
b) the high heat of hydration of Be2+ and Mg2+
c)
d)

84) Which of the following has a greater tendency for complex formation ?
a) Be
b) Mg
c) Ca
d) Ba

85) Of the metals A and B, both form oxides but B also forms a nitride, when both burn in air. So A and B are
a) Cs, K
b) Mg, Ca
c) Li, Na
d) K, Mg

86) Which of the following will have the largest value of Ksp ?
a)
b)
c)
d)

87) The main compound present in bones is
a)
b)
c)
d)

88) The most basic among the following is
a) ZnO
b) MgO
c)
d)

89) Dead burnt gypsum is
a)
b)
c)
d)

90) The weakest base among the following is
a) KOH
b) NaOH
c)
d)

91) Which of the following has the smallest radius ?
a)
b)
c)
d)

92) Lithopone is
a)
b)
c)
d) BaS + ZnS

93) The main component of teeth is
a)
b)
c)
d)

94) @ The action of very dilute HNO3 on magnesium gives
a) NO
b)
c)
d)

95) Which of the following is correct regarding the solubility of alkaline earth halides ?
a)
b)
c)
d) None

96) Salt cake is
a) NaCl
b)
c)
d)

97) The formula of Norwegian salt petre is
a)
b)
c)
d)

98) Which of the following is the correct order of the hydration energy of alkaline earth metal ions ?
a)
b)
c)
d) None

99) The correct order of solubility of fluorides of alkaline earth metals is
a)
b)
c)
d) None

100) Which of the following has the highest solubility in water ?
a)
b)
c)
d)


Answer :

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