S – BLOCK ELEMENTS (ALKALI AND ALKALINE EARTH METALS) – 3

1) Which of the following does not exist in solid form ?
a)
b)
c)
d)

2) Sodium carbonate reacts with SO2 in aqueous solution to give
a)
b)
c)
d)

3) The most probable oxidation state of an element with the electronic configuration of is
a)
b)
c)
d)

4) Permutit can be prepared by fusing
a) Sodium carbonate and alumina
b) Alumina and silica
c) Sodium carbonate, boron and silica
d) Sodium carbonate, alumina and silica

5) When zeolite which is hydrated sodium aluminium silicate, is treated with hard water, the Na+ ions are exchanged with
a)
b)
c)
d)

6) The strength of potash fertilizers is determined on the basis of percentage of
a)
b) K
c)
d)

7) Excess of NaOH solution reacts with zinc to form
a) Zinc hydroxide
b) Zinc oxide
c) Sodium zincate
d) Disodium zinc

8) When sodium chloride is dissolved in water, the sodium ion is
a) Oxidised
b) Hydrated
c) Reduced
d) None of these

9) In liquid ammonia, the blue colour of a solution of alkali metals is due to
a) Free electrons
b) Metallic ions
c) Ammonical electrons
d) Ammonical metal ions and electrons

10) Which one of the following alkali metals forms a nitride?
a) Li
b) Na
c) K
d) Rb

11) Which of the following shows lesser analogy ?
a) Li-Mg
b) Be-Al
c) B-Si
d) Na-Ga

12) Soda ash is
a)
b) NaOH
c)
d)

13) Electrolysis of molten NaCl leads to the formation of
a) Sodium and oxygen
b) Sodium and hydrogen
c) Hydrogen and oxygen
d) Sodium and chlorine

14) NaOH is manufactured by electrolysis of NaCl solution. The products of reaction are
a)
b)
c)
d)

15) The metal extracted by electrolysis of its fused salt is
a) Fe
b) Pb
c) Na
d) Cu

16) The stability of the following alkali metal chlorides follows the order
a) LiCl > KCl > NaCl > CsCl
b) CsCl > KCl > NaCl > LiCl
c) NaCl > KCl > LiCl > CsCl
d) KCl > CsCl > NaCl > LiCl

17) In certain matters lithium differs from other alkali metals. The main reason for this is
a)
b) the extremely high electropositivity of Lithium
c) the greater hardness of lithium
d)

18) Identify the correct statement
a) Elemental sodium can be prepared and isolated by electrolysis of an aqueous solution of sodium chloride
b) Elemental sodium is a strong oxidising agent
c) Elemental sodium is insoluble in ammonia
d) Elemental sodium is easily oxidized

19) Which one is most reactive ?
a) Na
b) K
c) Pb
d) Mg

20) Peroxides and super oxides of alkali metals are coloured because of the
a) Crystal defect
b) Presence of unpaired electrons
c) the defect partially and partially due to the presence of unpaired electrons
d) None of these

21) Which of the following is not characteristic of alkali metals ?
a) Low m.p.
b) Low electronegativity
c) High ionisation energies
d) Their ions are isoelectronic with noble gases

22) The chemistry of lithium is very much similar to that of Mg even though they are placed in different groups. The reason is that
a) Both have the same size
b) The ratio of their charge to size is same
c) Both have similar electronic configurations
d) Both are found together in nature

23) The microcosmic salt is
a)
b)
c)
d)

24) The alkali metal chloride soluble in pyridine is
a) LiCl
b) CsCl
c) NaCl
d) KCl

25) Considering the greater polarisation in LiCl compared to that in NaCl, which of the following statements is wrong ?
a) The m.p. of LiCl is lower than that of NaCl
b) LiCl dissolves more in organic solvent than NaCl
c) LiCl will ionise in water more than NaCl
d) Fused LiCl would be less conducting than fused NaCl

26) On heating anhydrous Na2CO3 which of the following gases is evolved?
a)
b) Steam vapour
c) CO
d) None of these

27) Typical elements of group IA react violently with water and the solution is
a) Acidic
b) Basic
c) Neutral
d) Amphoteric

28) The alkali metals are strong reducing agents due to their
a) Low ionization energy
b) Large ionic radii
c) High enthalpy of hydration
d) Potential value

29) Sodium carbonate contains
a) 5 molecules of crystalline water
b) 10 molecules of crystalline water
c) 3 molecules of crystalline water
d) No molecule of crystalline water

30) Sodium hydroxide does not react with
a) Al
b) Cu
c) Zn
d) None

31) Which of the following does not produce an alkaline solution in water ?
a)
b) NaOH
c)
d)

32) On prolonged exposure to air, sodium finally changes to
a)
b)
c) NaOH
d)

33) The outermost electron is most loosely held in
a) Na
b) K
c) Rb
d) Li

34) Which is not correct in the case of lithium ?
a)
b) Lithium has a great tendency to form hydrates
c) Lithium metal is not affected by air
d)

35) Which of the following compounds decomposes on heating similar to LiNO3 ?
a)
b)
c)
d) All

36) Which of the following will have the largest ionic radius ?
a)
b)
c)
d)

37) The alkali metal which is liquid at room temperature is
a) Fr
b) Cs
c) Rb
d) Na

38) Which of the following does not form peroxide on heating in air ?
a) Na
b) K
c) Ca
d) Li

39) Which of the following does not form an ionic hydride ?
a) Na
b) Rb
c) Ca
d) Li

40) The alkali metal that can directly react with carbon to form an ionic carbide is
a) Na
b) Rb
c) K
d) Li

41) Which of the following alkali metal carbonates is the least stable and decomposes most readily ?
a)
b)
c)
d)

42) When NaOH crystals are left in the open, they acquire a fluid layer around each crystal as
a) They start melting
b) They absorb moisture from the air
c) They react with air to form a liquid compound
d)

43) Potassium is kept in
a) Water
b) Kerosene
c) Alcohol
d)

44) Which of the following possesses the least ionic conductance ?
a)
b)
c)
d)

45) The alkali metal most suitable to be used in photo cells is
a) K
b) Cs
c) Na
d) Rb

46) In which of the following reactions is hydrogen acting as an oxidising agent ?
a) With Li to give LiH
b)
c)
d)

47) In a period, the electronegativity and ionisation energy of alkali metals is
a) Maximum
b) Minimum
c) Intermediate
d) Same as that of halogens

48) Hydration energy is maximum for
a)
b)
c)
d)

49) Which of the following ions is the best conductor of electricity in aqueous solution ?
a)
b)
c)
d)

50) Alkali metals do not exist in the free state in nature, because these are
a) Very reactive
b) Very volatile
c) Very inactive
d) None

51) In a period, alkali metals have the
a) Highest ionisation energy
b) Largest atomic radii
c) Highest density
d) Highest electronegativity

52) The decrease in melting point and boiling point of alkali metals with an increase in atomic number is due to
a) Weakening of covalent bonding
b) Weak ionic bonding
c) van der Waals forces
d) Weakening of metallic bonding

53) Hydrogen loses its electron to form H+ ions. In this respect it resembles
a) Transition metals
b) Alkali metals
c) Halogens
d) Noble gases

54) The Solvay process is used in the manufacture of
a)
b)
c)
d) All

55) Which of the following does not give an oxide on heating ?
a)
b)
c)
d)

56) What happens at the anode during electrolysis of fused NaCl ?
a)
b)
c)
d)

57) In the manufacture of caustic soda from brine, one of the important byproducts is
a) KOH
b)
c)
d)

58) A blue coloured solution of sodium in liquid NH3 acts as a strong reducing agent, because
a) Sodium releases an electron
b) Ammonia dissociates
c) Sodium nitride is formed
d) Of the reaction with dissolved oxygen

59) The main reason for not using a mercury electrolyte cell in NaOH manufacture is that
a) Hg is toxic
b) Hg is a liquid
c) Hg has a high vapour pressure
d) Hg is good conductor of electricity

60) Sodium metal cannot be stored in
a) Benzene
b) Kerosene
c) Alcohol
d) Toluene

61) The reaction of alkali metals given as M + Low Energy  M++ e shows that they are
a) Strongly electropositive
b) Strongly electronegative
c) Weakly electropositive
d) Strongly ionic in character

62) In the case of alkali metals
a) The cation is less stable than the atom
b) The cation is smaller than the atom
c) The cation and the atom have about the same size
d) The cation is larger than the atom

63) Which is the most basic oxide ?
a)
b) BaO
c)
d)

64) Which is most basic ?
a) RbOH
b) KOH
c) NaOH
d) LiOH

65) Generally sodium does not exhibit an oxidation state of +2, because of its
a) High first IE
b) High second IE
c) Large ionic radius
d) High electronegativity

66) Alkali metals have a low value of electronegativity which Â…Â…Â…Â… down the group
a) Decreases
b) Increases
c) Remains the same
d) None of these

67) RRR Sodium thiosulphate is used in photography to
a) Reduce AgBr to metallic Ag
b) Convert metallic Ag to Ag salt
c) Remove undecomposed AgBr as a soluble silver thiosulphate complex
d) Remove unreduced silver

68) Sodium reacts with water more vigorously than lithium because it
a) Has higher atomic weight
b) Is more electropositive
c) Is a metal
d) Is more electronegative

69) Fire extinguishers contain H2SO4 and
a)
b)
c)
d)

70) LiOH is a/an
a) Weak base
b) Strong base
c) amphoteric compound
d) acid compound

71) The phosphate of a metal has the formula MPO4. The formula of its chloride would be
a) MCI
b)
c)
d)

72) The most abundant salt of sodium in nature is
a)
b)
c) NaOH
d) NaCl

73) Which of the following salts gives an aqueous solution which is weakly basic ?
a)
b)
c) NaCl
d)

74) The electronic configuration of elements X, Y, Z and J are given below. Which element has the highest metallic character ?
a) X = 2, 8, 4
b) Y = 2, 8, 8
c) Z = 2, 8, 8, 1
d) J = 2, 8, 8, 7

75) Nitrates of I group on heating give
a)
b)
c) NO
d)

76) A metal forms a strong base, salts and stable carbonates. The metal is
a) Transition metal
b) Alkali metal
c) Alkaline earth metal
d) None

77) The melting point of alkali metals decreases with the
a) Decrease in atomic mass
b) Decrease in density
c) Decrease in size
d) Increase in size

78) Which decomposes on heating ?
a) NaOH
b) KOH
c) LiOH
d) CsOH

79) In the cell KCl is added to NaCl to
a) Lower its M.P.
b) Increase conductivity
c) Increase the dissociation
d) both a and b

80) The correct formula of hypo is
a)
b)
c)
d)

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

82) The M.P. and B.P. of alkali metals
a) Decreases with increase in atomic number
b) Increases with increase in atomic numbed
c) Remains constant with increase in atomic number
d) Are the same

83) The correct order in which the following oxides should be arranged according to the decrease in basic nature is
a)
b)
c)
d)

84) Which among the following statements is not correct ?
a) Lithium is the softest among all the alkali metals
b) Lithium possesses higher melting and boiling points
c) It is the least reactive among alkali metals
d) It forms a chloride which is soluble in alcohol

85) The substance used as an antichlor in bleaching is
a)
b) NaOH
c)
d) NaCl

86) Compared with alkaline earth metals, the alkali metals exhibit
a) Smaller ionic radii
b) Greater hardness
c) High boiling point
d) Lower ionisation energies

87) A colourless salt colours a Bunsen flame lilac and turns red litmus paper blue. The salt is
a)
b)
c)
d)

88) With the increase in atomic weight what happens to the melting points of the alkali metals ?
a) Increase
b) Decrease
c) Remains constant
d) Do not show a definite trend

89) Which of the following reacts with water at a high rate ?
a) Li
b) K
c) Ba
d) Cs

90) Sodium is made by the electrolysis of a molten mixture of about 40% NaCl and 60% CaCl2, because
a)
b) The mixture has a lower melting point than NaCl
c)
d)

91) From the following, choose the solid with high electrical and thermal conductivity:
a) Si
b) Li
c) NaCl
d) Ice

92) Which of the following statements is false for alkali metals ?
a) Li is the strongest reducing agent
b) Na is amphoteric in nature
c)
d)

93) The reactivity of the alkali metal sodium with water, is made use of
a) In the drying of alcohols
b) In the drying of benzene
c) In the drying of ammonia solution
d) As a general drying agent

94) Which of the following has density greater than water ?
a) Li
b) Na
c) K
d) Cs

95) The pink colour of non-stoichiometric LiCl is due to
a)
b)
c) Electrons in the lattice
d) None of these

96) Which among the following is least stable and decomposes more readily ?
a)
b)
c)
d)

97) Fires that result from the combustion of alkali metals can be extinguished by
a)
b) Sand
c) Water
d) Kerosene

98) The most common alum is
a)
b)
c)
d)

99) Which of the following compounds is efflorescent ?
a)
b)
c)
d)

100) Since the ionisation potential of the alkali metals is low, they are identified by the flame test. The flame colour imparted by sodium is
a) Red
b) Violet
c) Orange
d) Yellow


Answer :

 

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