S – BLOCK ELEMENTS (ALKALI AND ALKALINE EARTH METALS) – 1

1) Saltpetre and Chile saltpetre are respectively
a) KNO3, NaNO3
b) NaNO3,KNO3
c) KNO2,NaNO2
d) NaNO2,KNO2

2) Potassium burns in SO2 to give
a) K2SO4 + K2S2O3
b) K2SO3 + K2 S2O3
c) K2SO4 + K2S
d) K2O + K2SO3

3) Sodium metabisulphite is
a) NaH SO2
b) Na2S2O5
c) NaHSO3
d) Na2S2O3

4) The reagent used to test the presence of F ions in aqueous solutions is
a) CaCI2
b) FeCI3
c) both a & b
d) AgNO3

5) The highest M.P among alkali metal chlorides is for
a) LiCl
b) NaCI
c) KCI
d) CsCI

6) The highest M.P. and density for alkali metals is for the pair
a) Li, Cs
b) Li,Li
c) Cs,Cs
d) Cs,K

7) Beryllium and Aluminium react with alkali to form beryllates and aluminates respectively. They are
a) [Be(OH)4]2-, [AI (OH)5]3-
b) [Be(OH)2]2-, [AI()H)4 ]
c) [Be(OH)3], [AI()H)4]-1
d) [Be(OH)4]3-, [AI(OH)6]3-

8) The highest Ksp value for alkali metal hydroxides is for
a) Mg(OH)2
b) Ca(OH)2
c) Ba(OH)2
d) Sr(OH)2

9) The hybridisation of Boron in diborane is
a) sp
b) sp2
c) sp3
d) dsp2

10) Lithium is the strongest reducing agent among alkali metals because
a) it has the highest I.P value among alkali metals
b) Li + is heavily hydrated in water because of its small size
c) the high hydration energy helps in the release of electrons
d) it has the lowest value for oxidation potential

11) The bridge bond in diborane is
a) 2-c-3 e bond
b) 3 – c -2 e bond
c) 3-c-3 e bond
d) 2-c-2 e bond

12) The crystal structure of alkali metals conforms to
a) simple cubic
b) body-centred cubic
c) face centred cubic
d) triclinic

13) Bromine reacts with hot concentrated alkali to give
a) Br, BrO3
b) Br, BrO
c) Br, BrO4
d) BrO, BrO4

14) The amount of water that should be added to 500 ml of 0.5 N solution of NaOH to give a concentration of 10 mg per ml is
a) 100
b) 200
c) 250
d) 500

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

16) Which of the following compounds of cement sets at the slowest rate ?
a) Dicalcium silicate
b) Tricalcium silicate
c) Tricalcium aluminate
d) Tetracalcium aluminoferrite

17) The electronic configuration of the calcium atom may be written as
a)
b)
c)
d)

18) In the preparation of sodium carbonate (Na2CO3)which of the following is used ?
a) Slaked lime
b) Quick lime
c) Lime stone
d) Sodium hydroxide

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

20) When sodium chloride is dissolved in water, the sodium ion is
a) Oxidised
b) Reduced
c) Hydrolysed
d) Hydrated

21) Dolomite has the composition
a)
b)
c)
d)

22) An example of a double salt is
a) Bleaching powder
b)
c) Hypo
d) Potash alum

23) Plaster of Paris hardens by
a) Giving off CO2
b) Changing into CaCO3
c) Combining with water
d) Giving out water

24) The process associated with sodium carbonate manufacture is known as
a) chamber
b) Harber
c) Solvay
d) Castner

25) Baking powder has one of the following constituents
a)
b)
c)
d)

26) 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) None of these

27) The gas evolved on heating is
a)
b) water vapour
c) CO
d) No gas

28) Bleaching powder is a compound having a formula
a)
b)
c)
d)

29) Gypsum, on heating to about forms plaster of Paris which has a chemical composition represented by
a)
b)
c)
d)

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

31) When zeolite, which is hydrated sodium aluminum silicate, is treated with hard water, the sodium ions are exchanged with
a) alone
b) alone
c) alone
d) Ca2+ ions and Mg2+ ions

32) Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When carbon dioxide is bubbled through A, it turns cloudy. What is the chemical formula of A?
a)
b)
c)
d)

33) Potassium metal is commercially prepared by the reduction of molten KCl with metallic sodium at . This method is based upon the following principle:
a) Sodium is more reactive than potassium at this temperature
b) Potassium being more volatile distills off thus shifting the reaction forward
c) Sodium prefers to bind to chloride ions in preference to potassium ions
d) Potassium and sodium form an alloy at this temperature

34) Epsom salts is the hydrate of one of the following:
a) Magnesium sulphate
b) Ferrous ammonium sulphate
c) Magnesium ammonium phosphate
d) Calcium sulphate

35) The chemical formula of Epsom’s salt is
a)
b)
c)
d)

36) Which of the following compounds gives a yellow colour on reaction with NaOH and H2O2 ?
a)
b)
c)
d) None

37) Which of the following imparts violet colour to the Bunsen burner non-luminous flame ?
a) NaCl
b)
c)
d) KCl

38) Caesium oxide will be
a) Very strongly basic
b) Acidic
c) Weakly basic
d) Amphoteric

39) In an NaCl crystal, Na+ and Cl ions are in the form of
a) Ions
b) Electrons
c) Atoms
d) Molecules

40) Baking soda is
a)
b)
c) NaOH
d)

41) Lithium shows a diagonal relationship with
a) Mg
b) Be
c) Al
d) B

42) The valence shell electronic configuration of alkali metals is
a)
b)
c)
d)

43) In K+F , the ionic radius of F is greater, while the atomic radius of K+ is
a)
b)
c) Equal to F
d) None of these

44) The atomic radii of alkali metals (M) lie in the order Li < Na < K < Rb, but the radii of M+ ions in aqueous solution lie in the reverse order Li+ > Na+ > K+ and Rb+. What is the reason for this reverse order (on going from Li to Rb) ?
a) The gradual increase in ionisation energy
b) The increasing weakness of the metallic bond
c) The increasing electropositive character
d) The decreasing degree of hydration

45) Na imparts a yellow colour to the Bunsen flame because of its
a) Low ionisation potential
b) Sensitivity
c) Sublimation
d) Absorbed high radiation

46) A solution of Na in liquid serves as a good reducing agent due to the reaction
a)
b)
c)
d) yielding solvated electrons

47) The metallic lustre exhibited by sodium is explained by
a) the diffusion of sodium ions
b) the oscillation of mobile valence electrons
c) the excitation of free protons
d) the existence of body centred cubic lattice

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

49) A neutral white solid (sodium salt) on heating liberates a gas and leaves an alkaline residue. The gas turns lime water milky. The solid is
a)
b)
c)
d)

50) Lithium iodide is
a) Ionic
b) Covalent
c) Partially covalent
d) None

51) The pair of compounds which cannot exist together is
a)
b)
c)
d)

52) Which of the following properties of alkali metals increases in magnitude as the atomic number increases ?
a) Ionic radius
b) Electronegativity
c) Melting point
d) First ionisation energy

53) Mark the nitrate which decomposes differently on heating.
a)
b)
c)
d)

54) Which of the following electronic configurations represents the configuration of the most electropositive elements ?
a)
b)
c)
d)

55) The alkali metals
a) Form salt-like hydrides
b) Form salts which are predominantly covalent
c) Show decreased chemical reactivity with dry oxygen in going from Li to Cs
d) Show increasing electronegativity from Li to Cs

56) The lightest metal among the following is
a) Na
b) Ca
c) Li
d) Mg

57) The nitride ion in lithium nitride is composed of
a) 7 protons + 7 electrons
b) 10 protons + 7 electrons
c) 7 protons + 10 electrons
d) 10 protons + 10 electrons

58) Which of the following statement regarding isolation of Na and K metals is true ?
a) These metals can be isolated by the reduction of their oxides
b) These metals can be prepared from their aqueous salt solutions by metal displacement
c) These metals can be prepared by the electrolysis of their aqueous salt solutions
d) These metals can be prepared by the electrolysis of their fused chlorides

59) Alkali metals displace hydrogen from water forming bases due to the fact that
a) They are far above hydrogen in the electrochemical series based on oxidation potential
b) They are far below hydrogen in the electrochemical series based on oxidation potential
c) Their ionisation potential is less than that of other metals
d) They contain only one electron in their valence shell

60) Which among the following is the most basic?
a) Na2O
b)
c)
d)

61) Which of the first, second, third and fourth ionisation energy values for Ca shows a sudden increase?
a) Third
b) Second
c) First
d) Fourth

62) The IInd ionisation potential is maximum in the case of
a) Be
b) Mg
c) Ca
d) Sr

63) The 1st ionisation energies of alkaline earth metals are greater than those of alkali metals because of
a) the increase in nuclear charge on the alkaline earth metals
b) the decrease in nuclear charge on the alkaline earth metals
c) No change in the nuclear charge
d) None of the above

64) The first, second, and third ionisation energies for magnesium are
a)
b)
c)
d)

65) Which of the following is an s-block element ?
a) Aluminium
b) Chromium
c) Niobium
d) Potassium

66) Washing soda has the formula
a)
b)
c)
d)

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

68) Potassium carbonate cannot be prepared by the Solvay process because
a)
b)
c)
d)

69) Which of the following is an ore of potassium?
a) Carnallite
b) Cryolite
c) Bauxite
d) Dolomite

70) The formula of carnallite is
a)
b)
c)
d)

71) Which of the following is added in process to reduce the melting point of NaCl?
a) KCl
b) KF
c)
d) KI

72) Mark the wrong statement
a) K boils at the melting point of KCl
b) K is insoluble in molten KCL
c) K is extracted by electrolysis of fused KOH
d) K is extracted by reduction of molten KCl by metallic Na

73) As compared to NaHCO3, the solubility of KHCO3 in water is
a) Less
b) Equal
c) More
d) None of the above

74) In fusion mixture, which of the following is added to Na2CO3 powder ?
a)
b)
c)
d)

75) Which of the potassium salts is an ingredient of baking powder ?
a)
b)
c) Potassium citrate
d) Potassium hydrogen tartarate

76) In the red blood cells of human beings, which of the following ions is at a higher concentration?
a)
b)
c)
d)

77) Which of the following is not an ore of magnesium ?
a) Carnallite
b) Magnesite
c) Dolomite
d) Gypsum

78) 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

79) One of the following has an exceptionally high melting point:
a) MgO
b) NaOH
c) NaCl
d) KCl

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

81) When hydrated magnesium chloride is heated
a) MgO is formed
b)
c) Mg(OH)Cl is formed
d)

82) From hydrated magnesium chloride, anhydrous magnesium chloride can be prepared by heating the hexahydrate in
a) Air
b) Vacuum
c) A current of dry chlorine
d) All the above

83) Magnesium burns in air to give
a) MgO alone
b) alone
c) alone
d)

84) In Grignard’s reagent, the metal present is
a) Cd
b) Ca
c) Mg
d) Li

85) The species present in chlorophyll is
a) Mg
b)
c)
d) None

86) Which of the following is a magnesite ore ?
a)
b)
c)
d)

87) Which of the following is not a compound of calcium ?
a) Chalk
b) Gypsum
c) Quick lime
d) Silica

88) Calcium is extracted by electrolysis of
a)
b)
c)
d)

89) The purpose of adding CaF2 to CaCl2 in the electrolytic process for the extraction of calcium is
a) To increase the purity of calcium chloride
b) To form an eutectic mixture
c) To decrease the melting point
d) To accelerate the process of oxidation of calcium

90) A suspension of slaked lime in water is called
a) Quick lime
b) Water of lime
c) Washing of lime
d) Milk of lime

91) A compound X on heating gives a colourless gas. The residue is dissolved in water to obtain Y. Excess CO2 is passed through the aqueous solution of Y when Z is formed. Z on gentle heating gives back X. The compound X is
a)
b)
c)
d)

92) On mixing with an adequate quantity of water, Plaster of Paris sets into a hard solid having the composition
a)
b)
c)
d)

93) Calcium oxide is called
a) Quick lime
b) Milk of lime
c) Lime stone
d) Slaked lime

94) Calcium carbide is obtained when
a) Calcium is heated with coke at 3300K
b) Calcium carbonate is heated
c) Quick lime is heated with coke at 3300 K
d) All the three above

95) Which is not an ore of Ca ?
a) Lime stone
b) Fluorspar
c) Dolomite
d) Epsom salt

96) Calcium carbide when heated with a stream of nitrogen at 1000o C gives
a) Calcium cyanide
b) Calcium cynamide
c) Calcium nitride
d) Calcium carbonate

97) Nitrolim which is used as a fertilizer has the composition
a)
b)
c)
d)

98) Which of the following reactions takes place at the cathode in the electrolytic cell used for extraction of aluminium from alumina ?
a)
b)
c)
d)

99) The method used for refining of aluminium is
a)
b)
c)
d)

100) Which metal burns in air at a high temperature ?
a) Cu
b) Hg
c) Pb
d) Al


Answer :

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