S – BLOCK ELEMENTS (ALKALI AND ALKALINE EARTH METALS) – 5

1) The hydration energy of Mg2+ ions is larger than that of
a)
b)
c)
d)

2) Which one of the alkaline earth metals shows some anomalous behaviour and has the same electronegativity as aluminium ?
a) Ba
b) Sr
c) Ca
d) Be

3) Which of the following metal carbonates decomposes on heating ?
a)
b)
c)
d)

4) Which of the following are arranged in the order of increasing solubilities ?
a)
b)
c)
d)

5) RRR The wire of a flash bulb is made of
a) Mg
b) Cu
c) Ba
d) Ag

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

7) Which salt gives a crimson colour to the flame ?
a)
b)
c) NaCI
d)

8) Which of the following does not liberate O2 in the Bunsen burner ?
a) MgO
b)
c)
d)

9) A firework gives out crimson coloured light. It contains a salt of
a) Ca
b) Na
c) Sr
d) Ba

10) In India at the occasion of marriages, the fire works used give off green flames. Which one of the following radicals may be present ?
a) Na
b) K
c) Ba
d) Ca

11) Mg burns in
a)
b) CO
c)
d) None

12) Which one of the following statements is correct for alkaline earth metals ?
a)
b) They are highly electronegative elements
c)
d)

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

14) The alkaline earth metals Ba, Sr, Ca and Mg may be arranged in the order of their decreasing first ionisation potential as
a) Mg, Ca, Sr, Ba
b) Ca, Sr, Ba, Mg
c) Sr, Ba, Mg, Ca
d) Ba, Mg, Ca, Sr

15) Which of the following has the highest electrode potential ?
a) Be
b) Mg
c) Ca
d) Ba

16) Amongst the following hydroxides, the one which has the lowest value of Ksp at ordinary temperature (about 25°C) is
a)
b)
c)
d)

17) Which of the following sets can be called isoelectronic species ?
a)
b)
c) Na, Mg
d)

18) Which of the following shows the correct order of increasing basic strength ?
a) MgO < BeO < CaO < BaO
b) BeO < MgO < CaO < BaO
c) BaO < CaO < MgO < BeO
d) CaO < BaO < BeO < MgO

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

20) The atomic numbers of four elements are given below. Which one is an alkaline earth metal ?
a) 10
b) 20
c) 30
d) 40

21) Which one of the following substances is used in the laboratory for the fast drying of neutral gases?
a) Phosphorus pentoxide
b) Active charcoal
c) Anhydrous calcium chloride
d)

22) Which of the following metals is present in chlorophyll ?
a) Mg
b) Be
c) Ca
d) None of the above

23) The right order of the solubility of sulphates of alkaline earth metals in water is
a) Be > Ca > Mg > Ba > Sr
b) Mg > Be > Ba > Ca > Sr
c) Be > Mg > Ca > Sr > Ba
d) Mg > Ca > Ba > Be > Sr

24) The most electropositive amongst the alkaline earth metals is
a) Beryllium
b) Magnesium
c) Calcium
d) Barium

25) Amongst LiCI, RbCI, BeCI2 and MgCI2 the compounds with the greatest and the least ionic character, respectively, are
a) LiCI and RbCI
b)
c)
d)

26) An atom with atomic number 20 is most likely to combine chemically with the atom whose atomic number is
a) 11
b) 14
c) 16
d) 10

27) The decreasing order of the second ionization potential of K, Ca and Ba is
a) K > Ca > Ba
b) Ca > Ba > K
c) Ba > K > Ca
d) K > Ba > Ca

28) The melting point of calcium halides decreases in the order
a)
b)
c)
d)

29) Among the following, the melting point is lower for
a) Be
b) Mg
c) Ca
d) Sr

30) Which of the following imparts a brick red colour to the flame?
a) Ca
b) Ba
c) Sr
d) None of the above

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

32) To a clear solution of compound (X), a solution of BaCI2 is added and a heavy white precipitate is formed which does not dissolve in dil. HCI. The compound (X) is
a) A nitrate
b) A bromide
c) A sulphate
d) A carbonate

33) Which of the following will liberate hydrogen by its reaction with hydrochloric acid ?
a) Copper
b) Phosphorus
c) Mercury
d) Magnesium

34) A drying agent which absorbs carbon dioxide and reacts violently with water is
a) Sodium carbonate
b) Alcohol
c) Conc. sulphuric acid
d) Calcium oxide

35) Beryllium is placed above magnesium in the second group. Beryllium dust, therefore, when added to MgCI2 solution will
a) Have no effect
b) Precipitate Mg metal
c) Precipitate MgO
d) Lead to dissolution of beryllium metal.

36) Among the metals Be, Mg, Ca and Sr of group 2 (or group IIA) of the periodic table, the least ionic chloride would be formed by
a) Mg
b) Be
c) Ca
d) Sr

37) A metal salt solution forms a yellow precipitate with potassium chromate in acetic acid, a white precipitate with dilute sulphuric acid but gave no precipitate with sodium chloride or iodide. The white precipitate obtained when sodium carbonate is added to the metal salt solution will consist of
a) Lead carbonate
b) Basic lead carbonate
c) Barium carbonate
d) Strontium carbonate

38) Which of the following statements is false ?
a) Strontium decomposes water readily than beryllium
b) Barium carbonate melts at a higher temperature than calcium carbonate
c) Barium hydroxide is more soluble in water than magnesium hydroxide
d) Beryllium hydroxide is more basic than barium hydroxide.

39) Which of the following metals evolves hydrogen on reacting with cold dilute HNO3 ?
a) Mg
b) AI
c) Fe
d) Cu

40) Which of the following salts does not impart a colour to the flame ?
a) LiCI
b) KCI
c)
d)

41) Which of the alkaline earth metals is the strongest reducing agent ?
a) Ca
b) Sr
c) Ba
d) Mg

42) The white enamel of our teeth is made up of
a)
b)
c)
d)

43) The solubility in water of sulphates down the Be group is Be > Mg > Ca > Sr > Ba This is due to the
a)
b) Increasing molecular weight
c) Decreasing lattice energy
d) Increase in melting points

44) A salt on treatment with dil. HCI gives off a pungent smelling gas and a yellow precipitate. The salt gives a green flame test and a yellow precipitate with potassium chromate. The salt is
a)
b)
c)
d)

45) The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because
a) There is an increase in the nuclear charge of the alkaline earth metals
b) There is a decrease in the nuclear charge of the alkaline earth metals
c) There is no change in the nuclear charge
d) None of the above

46) Identify the correct order of increasing thermal stabilities of the following compounds.

K2CO3 (I), MgCO3 (II), CaCO3 (III), BeCO3 (IV)
a) I < II < III <iv< font=””>
b) IV < II < III < I
c) IV < II < I < lll
d) II < IV < III < I

47) The property of the alkaline earth metals that increases with the atomic number is
a) Ionization energy
b) Solubility of their hydroxides
c) Solubility of their sulphates
d) Electronegativity

48) The one which does not show variable valency is
a) Barium
b) Titanium
c) Copper
d) Lead

49) Which of the following is not dissolved by dilute hydrochloric acid?
a) ZnS
b) MnS
c)
d)

50) The characteristic outer electronic configuration of alkaline earth metals is
a)
b)
c)
d)

51) Alkaline earth metals form ions of the general formula
a)
b)
c) M
d)

52) The first ionization potential of Mg is
a) Less than Al
b) More than Al
c) Equal to Al
d) Zero

53) The hydroxide which is best soluble in water is
a)
b)
c)
d)

54) The first ionization potentials (eV) of Be and B respectively are
a) 8.29, 9.32
b) 9.32, 9.32
c) 8.29, 8.29
d) 9.32, 8.29

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

56) RRR One which is not dissolved by dilute HCI is
a) ZnS
b) MnS
c)
d)

57) Metals belonging to the same group in the periodic table are
a) Mg and Na
b) Mg and Cu
c) Mg and Ba
d) Mg and K

58) Compounds of alkaline earth metals have the following magnetic nature:
a) Diamagnetic
b) Paramagnetic
c) Ferromagnetic
d) Antiferromagnetic

59) A certain chloride dissolves appreciably in cold water. When placed on a Pt wire in Bunsen flame, no distinctive colour is noted. Which cation could be present ?
a)
b)
c)
d)

60) The solubility in water of sulphates down the Be group is Be > Mg > Ca > Sr > Ba. This is due to the
a) High ionization energy
b) Increase in melting point
c) Higher coordination number
d) All of these

61) Chemical A is used for water softening to remove temporary hardness. A reacts with Na2CO3 to generate caustic soda. When CO2 is bubbled through A, it turns cloudy. What is the chemical formula of A?
a)
b) CaO
c)
d)

62) Blanc fire used in paints is
a)
b)
c) Suspension of slaked lime
d)

63) Mg is an important component of which bio- molecule occurring extensively in the living world ?
a) Haemoglobin
b) Chlorophyll
c) Florigen
d) ATP

64) @ A metal X on heating in nitrogen gas gives Y. Y on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a blue colour. Y is
a)
b)
c)
d) MgO

65) The set representing the correct order of first ionization potential is
a) K > Na > Li
b) Be > Mg > Ca
c) B > C > N
d) Ge > Si > C

66) Which of the following shows a high tendency to form a peroxide ?
a) Lithium
b) Beryllium
c) Magnesium
d) Radium

67) Mark the compound which does not contain calcium carbonate:
a) Fluorspar
b) Iceland spar
c) Marble
d) Limestone

68) Which of the following compounds is not used as a fertilizer?
a) Super phosphate of lime
b) Nitrolim
c) Hydrolith
d) Ammonium sulphate

69) Which of the following on thermal decomposition yields a basic as well as an acidic oxide ?
a)
b)
c)
d)

70) Which of the following alkaline earth metal oxides shows a coordination number four ?
a) BeO
b) MgO
c) SrO
d) CaO

71) Which of the following statements is/are wrong ?
a) Be salts are extensively hydrolysed
b) Anhydrone can be used to dry organic materials
c)
d)

72) The basic character of the oxides MgO, SrO, K2O, NiO, Cs2O increases in the order
a)
b)
c)
d)

73) Which of the following is the component of most kidney stones ?
a)
b)
c)
d)

74) The carbide of which of the following metals on hydrolysis gives allylene or propyne ?
a) Be
b) Ca
c) Al
d) Mg

75) Which of the following has the lowest melting point?
a)
b)
c)
d)

76) The flame test is not given by
a) Ag
b) Be and Mg
c) Ca
d) Sr

77) Which of the following hydrides are covalent and polymeric ?
a) Ca
b) Ba
c) Be and Mg
d) Ag

78) Which component of cement sets at the lowest rate ?
a) Dicalcium silicate
b) Tricalcium silicate
c) Tricalcium aluminate
d) Tetracalcium alumino ferrite

79) Which of the following statements are false ?
a)
b) Calcium hydride is called hydrolith
c) Carbides of both Be and Ca react with water to form acetylene and the oxides of both Be and Ca are amphoteric.
d) None of these

80) Magnesium burns in the atmosphere of which of the following gases ?
a)
b)
c)
d) All of the above

81) Which of the following are ionic carbides ?
a)
b)
c)
d) All of these

82) Which of the following salts are composed of isoelectronic cations and anions ?
a) NaCI
b)
c) CaS
d) Both b and c

83) Which of the following groups of elements have chemical properties that are most similar?
a) Na, K, Ca
b) Mg, Sr, Ba
c) Be, Al, Ca
d) Both b and c.

84) Which of the following properties show a reverse trend on moving from Mg to Ca within the group?
a) Density
b) Solubility of sulphates
c) Melting points
d) Both a and c

85) The alkaline earth metals forming ionic oxides having a rock salt structure with 6 :6 coordination are
a) MgO
b) CaO
c) SrO
d) All of these

86) Which of the following substances can be used for drying gases ?
a) Calcium carbonate
b) Sodium carbonate
c) Sodium bicarbonate
d) Calcium oxide

87) Epsom salt is
a)
b)
c)
d)

88) Among the alkaline earth metals, the element forming predominantly covalent compound is
a) Ba
b) Sr
c) Ca
d) Be

89) Which is used in the preparation of Portland cement ?
a) Limestone, clay and sand
b) Limestone, gypsum and sand
c) Limestone, gypsum and alumina
d) Limestone, clay and gypsum

90) Which of the following is obtained when N2 reacts with calcium carbide ?
a) Calcium cyanate
b) Calcium acetate
c) Calcium cyanamide
d) Calcium carbonate

91) Which one of the following has the maximum hydration energy ?
a)
b)
c)
d)

92) Which of the following gives a precipitate with Pb(NO3)2 but not with Ba(NO3)2 ?
a) Sodium chloride
b) Sodium acetate
c) Sodium nitrate
d) Sodium hydrogen phosphate

93) RRR Which of the following substances is used in the laboratory for the fast drying of neutral gases ?
a) Sodium phosphate
b) Phosphorus pentoxide
c) Sodium sulphate
d) Anhydrous calcium chloride

94) Plaster of Paris is hard due to
a) Crystallisation
b) Hydration
c) Both
d) None

95) Alkaline earth metals come under
a) Halogen
b) Representative elements
c) Transition elements
d) Inner transition

96) Which of the following represents calcium chlorite ?
a)
b)
c)
d)

97) A metal is burnt in air and the ash on moistening smells of NH3. The metal is
a) Na
b) Fe
c) Mg
d) Al

98) Which of the following is the strongest base ?
a)
b)
c)
d)

99) Calcium is obtained by
a)
b)
c)
d) Roasting limestone

100) The first ionisation energies of the alkaline earth metals are higher than those of the alkali metals. This is because
a) There is an increase in the nuclear charge of the alkaline earth metal
b) There is a decrease in the nuclear charge of the alkaline earth metal
c) There is no change in the nuclear charge
d) None of these


Answer :

 

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