S – BLOCK ELEMENTS (ALKALI AND ALKALINE EARTH METALS) – 4

1) A trend common to both alkali metals and halogens is that as the atomic number increases, the
a) Atomic radius increases
b) Boiling point increases
c) Electronegativity increases
d) Reactivity with water increases

2) When sodium is dissolved in NH3, the blue colour is due to
a) Solvated electrons
b)
c)
d) Absorption of light

3) Which of the following is paramagnetic ?
a)
b)
c)
d)

4) Which of the following oxides is formed when potassium metal is burnt in excess of air ?
a)
b)
c)
d)

5) Which among the following has the highest melting point ?
a) NaF
b) NaCl
c) NaBr
d) Nal

6) The correct order of reactivity with water is
a) Li > Na > K > Rb > Cs
b) Li > K > Na > Cs > Rb
c) Rb > Na > K > Li > Cs
d) Cs > Rb > K > Na > Li

7) Sodium nitrate is not used in gun powder because it is
a) Hygroscopic
b) Very soluble in water
c) Amorphous
d) Deliquescent

8) Which among the following is most stable ?
a) LiH
b) NaH
c) KH
d) RbH

9) Which of the following alkali metals has the lowest reduction potential ?
a) Li
b) Na
c) K
d) Rb

10) Lattice energy is lowest for
a) LiF
b) NaCl
c) KBr
d) Csl

11) Which of the following is the correct order of chemical reactivity with water according to the electrochemical series ?
a) K > Mg > Zn > Cu
b) K > Mg > Cu > Zn
c) Cu > Zn > K > Mg
d) Mg > K > Cu > Zn

12) Which will show highest lattice energy ?
a) PbF
b) CsF
c) NaF
d) KF

13) Which of the following statements is false regarding saline hydrides ?
a) They conduct electricity in molten state
b)
c) They are used as reducing agents
d) They are covalent in nature

14) A silvery white metal, lighter than water can be produced only by the electrolysis of its fused chloride, with great difficulty. It is the sixth most abundant metal in the earth crust. The metal is used in Wurtz reaction, Wurtz Fittig reaction and Brick reduction. The metal is
a) K
b) Mg
c) Ca
d) Na

15) On heating sodium metal in a current of ammonia, the compound formed is
a) Sodium nitride
b) Sodium hydroxide
c) Sodium amide
d) Sodium azide

16) Crude common salt is hygroscopic because of impurities of
a)
b)
c)
d)

17) Which one of the following acts as a reducing as well as oxidising agent ?
a)
b)
c)
d)

18) The composition of common baking powder is
a) Starch, sodium carbonate, citric acid
b) Sodium bicarbonate, tartaric acid
c) Starch, sodium bicarbonate, citric acid
d) Starch, sodium bicarbonate, potassium hydrogen tartrate

19) When heating chromite with sodium carbonate the product will be
a)
b)
c) FeO
d)

20) Which of the following has the largest size ?
a) Na
b)
c)
d) None

21) Which of the following has the minimum cation-anion ratio ?
a) NaCl
b) KCl
c)
d)

22) The alkali metal which is used as a nutrient for plants is
a) Na
b) K
c) Li
d) Rb

23) The chloride of which of the following forms a hydrate ?
a) Li
b) Na
c) Cs
d) Rb

24) Among the statements given below which one is not helpful in explaining the diagonal relationship ?
a) Similarity in ionic sizes
b) Same charge to size ratio
c) Constancy in ionisation energy
d) Similarity in chemical reaction

25) Which of the following compounds will be formed when lithium is heated with excess of oxygen ?
a)
b)
c) LiO
d)

26) The ashes of plants contain alkali metal, 90% of which is
a) K
b) Li
c) Cs
d) Ca

27) The salt added to table salt to make it flow freely in the rainy season is
a)
b) KCl
c)
d)

28) Which of the following configuration corresponds to alkaline earth metals ?
a)
b)
c)
d)

29) ln which one of the following sets are there three members of the alkaline earth family of metals ?
a) Aluminium, strontium, potassium
b) Lithium, sodium, potassium
c) Magnesium, barium, calcium
d) Rubidium, cesium, francium.

30) Select from each of the following sets those elements which belong to the same group or sub-group of the periodic table ?
a) At. Nos. 12, 38, 4, 88
b) At. Nos. 9, 16, 35, 3
c) At. Nos. 11,19,27,5
d) At. Nos. 24, 47, 42, 55

31) Alkaline earth metals (group 2 or IIA elements) differ from group 12 (or IIB) elements in the electronic configuration of their
a) Antepenultimate shell
b) Innermost shell
c) Outermost shell
d) Penultimate shell

32) Alkaline earth metals show typical characteristics of
a) Inner transition elements
b) Noble gases
c) Representative elements
d) Transition elements

33) The elements of group 2 are called alkaline earth metals because
a) They are alkaline in nature
b)
c)
d) These are s-block elements

34) In alkaline earth metals, the electrons are more firmly held to the nucleus and hence the
a) lonization energy of alkaline earth metals is greater than that of alkali metals
b) Alkaline earths are less abundant in nature
c) Reactivity of alkaline earth metals is greater than that of alkali metals
d) Atoms of alkaline earth metals are bigger in size than alkali metals

35) Which of the following has the highest first ionization energy ?
a) Ba
b) Mg
c) Ca
d) Be

36) The first ionization energy of magnesium is lower than the first ionization energy of
a) Lithium
b) Sodium
c) Calcium
d) Beryllium

37) The oxidation state shown by the alkaline earth metals is
a) +2
b) + 1, +2
c) – 2
d) – 1,-2

38) The most electronegative alkaline earth metal is
a) Be
b) Mg
c) Ca
d) Ra

39) Which of the following represents the electronic configuration of the most electropositive alkaline earth metal ?
a)
b)
c)
d)

40) Alkaline earth metals form dipositive ions instead of unipositive ions because
a) The second ionization energy is almost double than the first ionization energy
b) Unipositive ions do not have stable configuration
c) The hydration energy of dipositive ions more than compensates the higher value of the second ionization energy
d) Unipositive ions are highly hydrated

41) Which of these elements show a diagonal relationship?
a) Be and Mg
b) Li and Na
c) Li and Mg
d) Be and Ba

42) The electronegativity of aluminium is almost the same as that of
a) Barium
b) Beryllium
c) Strontium
d) Calcium

43) Beryllium and aluminium have similar properties because
a) They belong to the same group
b) They have the same charge
c) They have similar outer electronic configuration
d) They have the same polarizing power

44) Alkaline earth metals are
a) Reducing agents
b) Oxidising agents
c) Amphoteric
d) Acidic

45) Which of the following is true for magnesium?
a) It is more electropositive than sodium
b) It is manufactured by electrolysis of aqueous magnesium chloride
c) It is a strong reducing agent
d) It resembles, in chemical properties, with Boron

46) Which of the following ions has the largest ionic radius ?
a)
b)
c)
d)

47) The least abundant alkaline earth metal is
a) Barium
b) Radium
c) Strontium
d) Beryllium

48) Of the following, the most reactive alkaline earth metal is
a) Beryllium
b) Barium
c) Calcium
d) Strontium

49) The heat of hydration is maximum for
a)
b)
c)
d)

50) Concrete is a mixture of
a) Cement, lime and water
b) Cement, sand and water
c) Cement, sand, gravel and water
d) Cement, slaked lime and water

51) One of the following statements is incorrect
a) Elements of group 2 are good conductors of electricity and heat
b) Compounds of group 2 elements are diamagnetic in nature
c) The salts of group 2 elements are more heavily hydrated than those of elements of group 1
d) Elements of group 2 are more electropositive than group 1 elements

52) The ion having the highest mobility in aqueous solution is
a)
b)
c)
d)

53) Density is lowest for
a) Mg
b) Ca
c) Sr
d) Ba

54) In comparison to alkali metals, alkaline earth metals are
a) Less reactive
b) Less reducing
c) Less basic
d) All the three

55) Alkaline earth metals form dipositive ions instead of unipositive ions because
a) Dipositive ions carry more charge
b) Their second ionisation energies are not different from first ionisation energy
c) Unipositive ions do not have stable configuration
d) Compounds containing dipositive ions have more lattice energy

56) One of the following has an exceptionally high melting point:
a) MgO
b) NaOH
c) NaCI
d) KCI

57) The order of decreasing polarity in the compounds CaO, CsF, KCI, MgO is
a) CaO, CsF, KCI, MgO
b) MgO, KCI, CaO, CsF
c) KCI, CaO, CsF, MgO
d) CsF, KCI, CaO, MgO

58) If the Na+ ion is larger than the Mg2+ ion and the S2- ion is larger than the CI ion, which of the following will be least soluble in water ?
a) Sodium chloride
b) Sodium sulphide
c) Magnesium chloride
d) Magnesium sulphide

59) The electric cookers have a coating that protects them against fire. The coating is made of
a) Heavy lead
b) Zinc oxide
c) Magnesium oxide
d) Sodium sulphate

60) Alkaline earth metal compounds are less soluble in water than the corresponding alkali metal compounds because the former have
a) Lower lattice energies
b) Higher ionization energies
c) Higher covalent character
d) Higher ionic character

61) Of the following, the metal which does not give a red flame test is
a) Lithium
b) Calcium
c) Strontium
d) Barium

62) Which of the following is most stable in ether?
a)
b)
c)
d) None of these

63) Which of the following is used in producing neutrons ?
a) Ra
b) Ba
c) Sr
d) Be

64) Which of the following is used as a scavenger in metallurgy ?
a) Be
b) Mg
c) Ca
d) Sr

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

66) Which of the following is used as barium meal for getting the X-ray spectrum of the human digestive system ?
a)
b)
c)
d)

67) The electronic configuration of two neutral elements A and B are
A= 1s2 2s2 2p6 3s2, and B=1s22s22p5 . Which of the following represents the structure of the compound formed by them ?

a) A-B
b)
c)
d)

68) The atom with atomic number 12 will most likely combine chemically with the atom whose atomic number is
a) 3
b) 10
c) 11
d) 16

69) Alkaline earth metals are not found free in nature because of
a) Their thermal instability
b) Their low melting points
c) Their high boiling points
d) Their greater chemical reactivity

70) Which among the following has a tendency to form covalent compounds?
a) Calcium
b) Beryllium
c) Magnesium
d) Strontium

71) Which of these does not form an ionic hydride?
a) Be
b) Ca
c) Ba
d) Sr

72) Which of the following elements will form a compound with oxygen in which one atom of the element is combined with one atom of oxygen to form an oxide of the formula MO ?
a) Be
b) Ne
c) Al
d) Cl

73) If strontium and sulphur combine, the formula for the product would most likely be
a)
b)
c) SrS
d)

74) Which of the following metals dissolves in sodium hydroxide with the evolution of hydrogen ?
a) Calcium
b) Magnesium
c) Beryllium
d) Strontium

75) The most basic alkaline earth metal hydroxide is
a)
b)
c)
d)

76) A piece of magnesium ribbon was heated to redness in an atmosphere of nitrogen and then cooled with water. The gas evolved is
a) Ammonia
b) Hydrogen
c) Nitrogen
d) Oxygen

77) Which liberates ammonia when treated with water ?
a)
b)
c)
d) All

78) Calcium does not combine directly with
a) Oxygen
b) Nitrogen
c) Hydrogen
d) Carbon

79) Magnesium burns in air to give
a)
b)
c)
d)

80) The least ionic carbide is formed by
a) Be
b) Mg
c) Ca
d) Sr

81) Magnesium burns in CO2 to form
a) MgO and CO
b)
c) MgO and C
d)

82) The cation which gives a yellow precipitate with potassium chromate is
a)
b)
c)
d)

83) Which of the following decomposes at highest temperature ?
a)
b)
c)
d)

84) Which element possesses maximum electropositive character ?
a) Mg
b) Be
c) P
d) Al

85) The reduction of BaSO4 with carbon gives
a)
b) BaS
c)
d) Ba

86) During military operations, hydrogen is generally obtained by the action of water on
a)
b)
c)
d)

87) In the reaction Mg + H2O    X + H2 ; X is
                                       (steam)

a) MgO
b)
c)
d) None of these

88) Barium burns in air to form
a) BaO
b)
c)
d)

89) BeF2 is highly soluble in water whereas the fluorides of other alkaline earth metals are almost insoluble because
a)
b)
c)
d)

90) In the reaction,

Be + 2 NaOH X + H2 ; X is
a)
b)
c) BeO
d) None of these

91) Both Be and Al become passive on treatment with conc. HNO3 due to the
a) Non-reacting nature of the metals
b) Non-oxidising nature of the acid
c) The formation of an inert layer of the oxide on the surface of the metals
d) All are correct

92) Anhydrone is
a)
b)
c)
d)

93) The value of x is maximum for
a)
b)
c)
d) All have the same value of x

94) A substance which gives a brick red flame and breaks down on heating to give both oxygen and a brown gas is
a) Calcium carbonate
b) Magnesium nitrate
c) Sodium nitrate
d) Calcium nitrate

95) Baryta and Barytes respectively are
a)
b)
c)
d)

96) The name Blue John is given to which of the following compounds ?
a)
b)
c)
d) CaO

97) Which of the following peroxides is thermally most stable ?
a)
b)
c)
d)

98) Which out of the following is extensively used as a refractory and in domestic heating appliances ?
a) BaO
b) CaO
c) MgO
d)

99) The alloy Electron used in the construction of aeroplanes has the composition
a) 15% Mg, 85% Al
b) 95% Mg, 5% Zn
c) 95% Mg, 5% Al
d) 80% Mg, 20% Zn

100) Out of the following elements which one do you expect to be most reactive chemically ?
a) Be
b) Ca
c) Ba
d) Sr


Answer :

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