S – BLOCK ELEMENTS (ALKALI AND ALKALINE EARTH METALS) – 7

1) The solubility of the alkaline earth metal hydroxides increases from Be(OH)2 to Ba(OH)2 because
a) Hydration energy > Lattice energy
b) Lattice energy > Hydration energy
c) Hydration energy is equal to lattice energy
d) None is correct

2) MgBr2 and MgI2 are soluble in acetone because of
a) Their ionic nature
b) Their covalent nature
c) Their co-ordinate nature
d) None is correct

3) All alkali earth metal ions are
a) Coloured
b) Colourless
c) Paramagnetic
d) Colourless and diamagnetic

4) RRR Setting of plaster of Paris involves.
a) Hydration
b) Transition
c) Expansion
d) All are correct

5) The element found in plant systems which forms an important constituent in photosynthesis is
a) Fe
b) Cu
c) Na
d) Mg

6) The function of sand in mortar is
a) To decrease the hardness
b) To make the mass compact
c) To decrease the plasticity of the mass
d) To prevent excess shrinkage which may result in cracks

7) Which of the following solids has the highest lattice energy ?
a)
b)
c)
d)

8) The metal which does not dissolve in liquid ammonia is
a) Calcium
b) Sodium
c) Beryllium
d) Potassium

9) In smoke screens, calcium phosphide is used because it
a) Catches fire easily
b) Burns and gives and soot
c) Decomposes thermally
d) Forms phosphine which gives smoke

10) Ca, Sr and Ba generally form ionic compounds because of
a) Their high lattice energies
b) Low lattice energies
c) Their covalent nature
d) Their high ionisation energies

11) Ca, Sr and Ba dissolve in liquid ammonia giving a … solution
a) Highly conducting
b) Highly reducing
c) Paramagnetic
d) All are correct

12) The rate of setting of cement can be increased by
a) NaCl
b) KCl
c)
d)

13) Cement sets better with water and hardens well on dampening because the material that gives hardness to cement consists of
a) Limestone
b) Stable salts
c) Hydrated salts
d) Water absorbing stones

14) The melting point is highest for
a) Be
b) Mg
c) Sr
d) Ca

15) Which compound gives a basic and acidic oxide simultaneously on thermal decomposition?
a)
b)
c)
d)

16) The alkaline earth metal oxide having the co-ordination number 4 is
a) MgO
b) BeO
c) SrO
d) CaO

17) BeF2 is soluble in water whereas the fluorides of other alkaline earth metals are insoluble because of the
a)
b)
c)
d) None

18) Hardening of cement is due to
a) Hydrolysis
b) Polymerisation
c) Dehydration
d) Hydration and hydrolysis

19) The low solubility of BaSO4 in water is due to the
a)
b)
c)
d) None

20) When zeolite (hydrated sodium aluminium silicate) is treated with hard water, the Na+ ions are exchanged with
a)
b)
c)
d) None

21) Disodium hydrogen phosphate in the presence of NH4Cl and NH4OH gives a precipitate with a solution of Mg2+ ions. The precipitate is
a)
b)
c)
d)

22) Gypsum on heating at 120-1300C gives a
a) Hemihydrate
b) Monohydrate
c) Dihydrate
d) Anhydrous salt

23) A salt used as a purgative is
a) NaCl
b)
c)
d)

24) The main constituent of egg shells is
a)
b)
c)
d)

25) The compound soluble in acetic acid is
a) CaO
b)
c)
d)

26) When hydrated MgCl2.6H2O is strongly heated
a) MgO is formed
b)
c) Mg(OH)Cl is formed
d)

27) BaSO4 on fusion with Na2CO3 gives
a) BaO
b)
c)
d)

28) The cation which forms a yellow precipitate with potassium chromate in acetic acid is
a)
b)
c)
d)

29) Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When CO2 is bubbled through A, it turns cloudy. What is A ?
a)
b) CaO
c)
d)

30) To a clear solution of compound X, a solution of BaCl2 is added and a heavy white precipitate is formed which does not dissolve in dilute HCl. X is
a) Nitrate
b) Bromide
c) Sulphate
d) carbonate

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

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

33) Calcium metal is used to produce high vacuum because it
a) Can remove water
b)
c) Is a good reducing agent
d) Is highly electropositive

34) Which of the following statements is not correct ?
a) Be like Al does not dissolve in alkalies
b) Oxides of both Be and Al are amphoteric
c)
d) Burning of limestone containing more than 10% aluminium silicate gives hydraulic mortar

35) Two metals X and Y form covalent halides. Both halides can act as Lewis acids and a catalyst in Friedel Crafts reaction. the halide of X is a polymer in the solid state and a dimer in the vapour state, and decomposes to a monomer at 1200 K. However, the halide of Y is a dimer in the vapour state and becomes ionic in the polar solvent. X and Y are respectively
a) Be, Al
b) Al, Be
c) Be, Ca
d) Mg, Ca

36) Mortar is a mixture of
a)
b) Slaked lime and water
c) Slaked lime, sand and water
d) None

37) Gypsum is added to clinker during cement manufacture to
a) Decrease the rate of setting of cement
b) Make the cement impervious
c) Bind the particles of calcium silicate
d) To facilitate the formation of colloidal gel

38) Portland cement is.
a) Calcium alumino silicate
b) Calcium aluminate + calcium silicate
c) A mixture of calcium oxide and silica
d) Calcium silicate + gypsum

39) Portland cement does not contain
a)
b)
c)
d)

40) Superphosphate of lime is a mixture of
a) Primary calcium phosphate and epsom salt
b) Primary magnesium phosphate and epsom salt
c) Primary magnesium phosphate and gypsum
d) Primary calcium phosphate and gypsum

41) Duraluminium is an alloy which contains
a) Mg + Al
b) Mg + Cu
c) Cu + Al
d) Mg + Cu + Al + Mn

42) RRR The blue coloured mineral Lapis Lazuli which is used as a semiprecious stone is a mineral of
a) Sodium alumino silicate
b) Zinc cobaltate
c) Basic copper carbonate
d) Prussian blue

43) Which of the following statements about AlCl3 is not correct ?
a) It exists as a dimer
b) It is a covalent compound
c) It involves back bonding between Cl and Al
d) Its aqueous solution conducts electricity

44) Boron differs from the other members of group III because
a) It has much lesser radius
b) It is a non metal
c) It is covalent in its compounds
d)

45) A certain compound when burnt gives three oxides. The first turned lime water milky. The second turned anhydrous CuS04 blue and the third formed an aqueous solution of low pH. The elements present in the compound are
a) C, O and S
b) C, H and Ca
c) C, H and Na
d) C, H and S

46) Which gas is used in very low temperature thermometers?
a)
b) He
c)
d)

47) The helium nucleus contains
a) 4 Protons
b) 4 neutrons
c) 2 neutrons and 2 protons
d) 3 protons and 2 electrons

48) The two electrons in the helium atom
a) Occupy different shells
b) Have different spins
c) Have the same spins
d) Occupy different subshells of the same subshell

49) Welding of magnesium can be done in an atmosphere of
a)
b) He
c)
d) All

50) The mineral from which potassium permanganate is manufactured is
a)
b)
c)
d)

51) Which one of the following oxidizing agents is not used for the oxidation of potassium manganate to potassium permanganate?
a)
b)
c)
d)

52) The electrolysis of potassium manganate solution gives
a)
b)
c)
d)

53) Baeyers reagent is
a)
b)
c)
d)

54) Which one of the following is not oxidized by acidified KMnO4?
a) Sod. oxalate
b) Pot. iodide
c) Ferrous sulphate
d) Sodium sulphate

55) Plaster of Paris is
a) CaSO4. H2O
b) 
CaSO4
c) 
CaSO4 . 2 H2O
d) 
CaSO4 . 1/2 H2O

56) Calcium is obtained by the
a) Electrolysis of molten calcium chloride
b) Electrolysis of a solution of calcium chloride
c) Reduction of Ca Cl2 with carbon
d) All of the given

57) Nesslers reagent is
a) KHg I4
b) 
K2Hg I4 + NH4OH
c) 
K2HgI4
d) 
KHgI4 + NH4OH

58) Magnesia mixture solution is used to test
a) As3+
b) 
PO4 3-
c) None
d) 
AS3+ and PO4 3-

59) Glazing of clay articles is generally done by
a) NaCl
b) KNO3
c) 
K2SO4
d) 
K2CO3

60) Baeyer’s reagent is
a) KMnO4 + H2SO4
b) 
KMnO4 + KOH
c) 
K2 Cr2 O7 + HCl
d) 
H2 Cr2 O7 + KOH

61) Soda ash has the chemical formula
a) Na2CO3
b) 
Na HCO3
c) 
Na OH
d) 
Na2O

62) Setting of cement is an
a) Exothermic reaction
b) Endothermic reaction
c) Neither exothermic nor endothermic
d) None of the above

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

64) Anhydrite is a name given to
a) Ca SO4
b) 
Ca S
c) 
Ca3 ( PO4)2
d) 
None of these

65) Which oxide is amphoteric?
a) Li2O
b) 
BeO
c) 
Ca O
d) 
K2O


Answer :

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