S – BLOCK ELEMENTS (ALKALI AND ALKALINE EARTH METALS) – 2

1) Name the process used for purification of white bauxite ore containing no iron oxide as impurity
a)
b)
c)
d)

2) Which of the following is known as fusion mixture ?
a)
b)
c)
d)

3) Aluminium bronze is an alloy of
a) Aluminium + Copper
b) Aluminium + Silver
c) Aluminium + Zinc
d) Aluminium + Tin

4) Which of the following is not isomorphous with true alum and is called pseudo alum ?
a)
b)
c)
d)

5) Potash alum dissolves in water to give a/an
a) Acidic solution
b) Alkaline solution
c) Amphoteric solution
d) Neutral solution

6) Alums are not formed by
a)
b)
c)
d)

7) Hall and Heroult’s process is used for
a) Extraction of Al
b)
c) Refining of Al
d) None of these

8) In potash alum, potassium and aluminium are present as
a) Simple cations
b) Metal atoms
c)
d) None of these

9) Cement containing no iron is
a) White
b) Grey
c) Red
d) Black

10) Cement containing an excess amount of lime is
a) Weak in strength
b) Cracks during setting
c) Slow setting
d) Quick setting

11) The setting of cement is an
a) Endothermic reaction
b) Exothermic reaction
c) Ordinary reaction
d) Uncontrolled reaction

12) The setting of cement is an example of
a) Dehydration
b) Hydration
c) Hydrolysis
d) None of these

13) Pure H2S can be obtained by the action of water on
a) FeS
b)
c) Flowers of S
d)

14) Sodium carbonate solution is alkaline due to
a)
b)
c)
d) None of the above

15) Which of the following compounds can make clothes fire proof ?
a)
b)
c)
d)

16) The compound which contains both ionic and covalent bonds is
a)
b) HCl
c) KCN
d) KCl

17) 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

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

19) Which of the following ion forms a hydroxide highly soluble in water ?
a)
b)
c)
d)

20) A major constituent of Portland cement (except lime) is
a) Silica
b) Alumina
c) Iron oxide
d) Magnesia

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

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

23) A solution of sodium metal in liquid ammonia is strongly reducing due to the presence of
a) Sodium atoms
b) Sodium hydride
c) Sodium amide
d) Solvated electrons

24) @ Molten sodium chloride conducts electricity due to the presence of
a) Free electrons
b) Free ions
c) Free molecules
d) Atoms of sodium and chlorine

25) Alum is used by dyers of clothes
a) For fire proofing fabrics
b) As first aid for cuts
c) For softening hard water
d) As a mordant

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

27) Which halide has the highest melting point ?
a) NaCl
b) NaBr
c) NaF
d) Nal

28) Leblanc process is employed in the manufacture of
a) Baking soda
b) Washing soda
c) Potash
d) Plaster of paris

29) Which is manufactured by electrolysis of fused NaCl ?
a) NaOH
b) Na
c) NaClO
d)

30) In the aluminothermite process, aluminium acts as
a) Oxidising agent
b) Flux
c) Reducing agent
d) Solder

31) Which metal is protected by a layer of its own oxide ?
a) Al
b) Ag
c) Au
d) Fe

32) Sodium carbonate reacts with SO2 in aqueous medium to give
a)
b)
c)
d)

33) Nitrogen dioxide cannot be prepared by heating
a)
b)
c)
d)

34) The setting of Plaster of Paris involves
a) Oxidation with atmospheric oxygen
b)
c) Dehydration
d) Hydration to yield another hydrate

35) The molecular formula of salt is
a)
b)
c)
d)

36) Which of the following imparts a violet colouration to the Bunsen burner’s non-luminous flame ?
a) NaCl
b)
c)
d) KCl

37) The causticisation process is used for the preparation of
a) Caustic soda
b) Caustic potash
c) Baryata solution
d) Slaked lime

38) Which of the following is radioactive ?
a)
b)
c)
d)

39) In the electrolysis of alumina, cryolite is added to
a) Lower the melting point of alumina, the only reason
b) Increase the electrical conductivity, the only reason
c) Minimise anodic effect
d) Both (a) and (b)

40) When CO2 is bubbled into an aqueous solution of Na2CO3 the following is formed:
a) NaOH
b)
c)
d)

41) The compound insoluble in acetic acid is
a) Calcium oxide
b) Calcium carbonate
c) Calcium oxalate
d) Calcium hydroxide

42) The formula of calcium cyanamide is
a)
b)
c) CaNCN
d)

43) Calcium cyanamide on treatment with steam under pressure gives NH3 and
a) Calcium carbonate
b) Calcium hydroxide
c) Calcium oxide
d) Calcium bicarbonate

44) The metallic lustre exhibited by sodium is explained by the
a) Diffusion of sodium ions
b) Oscillation of mobile valence electrons
c) Excitation of free protons
d) Existence of body centred cubic lattice

45) @ Magnesium keeps on burning in
a)
b)
c)
d)

46) Of the following the commonly used in a laboratory desiccator is
a)
b)
c) Dry NaCl
d) None of the above

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

48) An aqueous solution of sodium sulphate is electrolysed using inert electrodes.The products at the cathode and anode are respectively
a)
b)
c)
d)

49) Which of the following reactions will not give anhydrous AlCl3 ?
a)
b) By passing dry HCl on heated aluminium powder
c) By passing dry chlorine on heated aluminium powder
d) By passing dry chlorine over heated mixture of alumina and coke

50) Nitrolim is
a)
b)
c)
d) All

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

52) The drying agent which reacts with CO2 and removes water vapour is
a) CaO
b) NaOH
c)
d)

53) The wire in flash bulbs is made up of
a) Mg
b) Ba
c) Cu
d) Ag

54) The chemical composition of Plaster of Paris is
a)
b)
c)
d)

55) Which of the following on heating at 120oC gives Plaster of Paris ?
a) Borax
b) Gypsum
c) Alum
d) Calomel

56) Alum is not used
a) As a mordant in dyeing
b) As an insecticide
c) In the purification of water
d) In the tanning of leather

57) In which of the following minerals is aluminium not present ?
a) Cryolite
b) Mica
c) Feldspar
d) Fluorspar

58) The chloride of an element A gives a neutral solution in water. In the periodic table, the element A belongs to the
a) First group
b) Third group
c) Fifth group
d) First transition series

59) In the Solvay ammonia process, sodium bicarbonate is precipitated due to
a)
b)
c)
d) Reaction with NaOH

60) Which of the following statements is not true about potash alum?
a)
b) Its aqueous solution is basic in nature
c) It is used in dyeing industry
d) On heating it melts in its water of crystallization

61) Sodium reacts with water more vigorously than lithium because
a) It has higher atomic weight
b) It is more electronegative
c) It is more electropositive
d) It is a metal

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

63) An important ore of magnesium is
a) Malachite
b) Cassiterite
c) Carnallite
d) Galena

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

65) Crude common salt is hygroscopic because of the presence of impurities of
a)
b)
c)
d)

66) Which metal forms an amide with NH3 at 300°C?
a) Magnesium
b) Lead
c) Aluminium
d) Sodium

67) Which among the following is the best reducing agent in aqueous solution ?
a) Na
b) Li
c) Cs
d) Rb

68) Which alkali metal has the lowest melting point and exists as a liquid ?
a) Na
b) K
c) Rb
d) Cs

69) Which of the following carbonates does not yield CO2 on heating ?
a)
b)
c)
d)

70) A solid which on heating gives a gas that supports combustion of Mg and P4 is
a)
b)
c)
d)

71) The metal which is difficult to extract from its oxide is
a) Fe
b) Zn
c) Cs
d) Mg

72) When NH3 is passed over heated sodium at 300°C, the product formed is
a)
b)
c)
d)

73) KO2 is an example of a
a) Normal oxide
b) Super oxide
c) Suboxide
d) Peroxide

74) In the reaction M + O2 ® MO2 (super oxide) the metal is
a) Li
b) Na
c) K
d) Ba

75) Sodium sulphate is soluble in water but barium sulphate is sparingly soluble because
a) The hydration energy of sodium sulphate is more than its lattice energy
b) The lattice energy of barium sulphate is more than its hydration energy
c) The lattice energy has no role to play in solubility
d) The hydration energy of sodium sulphate is less than its lattice energy

76) The reason why alkali metals are soft is that
a) They are less metallic in nature
b) There is only one valence electron per nucleus
c) They do not have close packed structures
d) They have high I.E.

77) The least efflorescent among the following is
a)
b)
c)
d)

78) One would expect the elemental form of Cs at room temperature to be a/an
a) Network solid
b) Metallic solid
c) Non-polar liquid
d) Ionic liquid

79) Soda lime is
a)
b)
c)
d)

80) The most ionic chloride is
a) NaCl
b) CsCl
c)
d)

81) Among alkali metals, caesium should be
a) the least ionisable
b) More electropositive than Francium
c) the lightest of all
d) Having a low m.p and b.p.

82) The only element which is radioactive among alkali metals is
a) Cs
b) Fr
c) Rb
d) Li

83) Compounds of alkaline earth metals are less soluble in water than the corresponding alkali metal salts because of
a) Their increased covalent character
b) Their high ionisation energies
c) their high lattice energy
d) None

84) The reason for the lower basicity of alkaline earth metals compared to alkali metals is that
a) Alkali metals form ionic compounds
b) The bond of oxygen is more for alkali metals
c) The electropositivity of alkali metals is more than that of alkaline earth metals
d) The electropositivity of alkali metals is less than that of alkaline earth metals

85) Sodium burns in air to give mainly
a)
b)
c)
d)

86) The alkali metals are chemically similar because
a) Their valence shell electrons have same energy
b) Their outermost electrons have the same principal quantum number
c) Their valence shell electronic configuration is same
d) They are monoatomic

87) The largest ionic radius in water is that of
a)
b)
c)
d)

88) Which of the following does not form alum from its sulphate?
a) Cs
b) K
c) Na
d) Li

89) An alkali metal salt which is neither efflorescent nor deliquescent or hygroscopic is
a)
b)
c) NaOH
d) NaCl

90) Microcosmic salt reacts with coloured ions to form a characteristic bead which is due to the formation of
a) Metaphosphates
b) Borates
c) Phosphates
d) Metaborates

91) Black ash is
a)
b)
c)
d)

92) A solution of KOH in water is called
a) Potash lye
b) Soda lye
c) Salt cake
d) None

93) Which of the following is attacked by hot NaOH solution ?
a) Si
b) C
c) Sn
d) Pb

94) The fusion of AgCl and Na2CO3 gives
a)
b) Silver carbide
c) Ag
d)

95) Tin dissolves in boiling caustic soda solution due to the formation of
a)
b)
c)
d) None

96) Chile saltpetre is the ore of
a)
b) Cs
c) Na
d) Mg

97) Indian saltpetre is
a)
b)
c)
d) NaCl

98) Pearl ash is
a)
b)
c)
d) None

99) Oxone is the name given to
a) Ozone
b) Sodium peroxide
c) Sodium oxide
d) Sodamide

100) When KCl is heated with con. H2SO4 and solid K2Cr2O7 we get
a) Chromyl chloride
b) Chromous chloride
c) Chromic chloride
d) Chromic oxide


Answer :

 

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