class test

Class 11^th

Unit-XI   Some p-Block elements      17 x 3 =  51

Group-13 elements

Electronic configuration/ occurrence/ oxidation state

1.     The general outer electronic configuration of group 13 elements is

      a).    ns² np³                                        b).  ns² np^1-6` 

      c).    ns² np⁴                                        d).   (n-1)d^1-10  ns² np² 

2.     Gallium  has the electronic configuration

      a).  [Ar] 4s²  4p¹                                     b). [Ar] 3d¹⁰4s²  4p¹

      c).  [Kr]  5s² 5p¹                                   d).  [Kr] 3d¹⁰ 4s² 4p¹

3.     Which of the following set of atomic numbers belongs to group-13 elements.

a). 3, 11, 19      b).  2, 10, 18     c). 31, 13, 49       d).  7, 17, 31

4.       Which of the following is most abundant among group-13 elements in the earth crust ?

      a). Al     b). B        c). Ga        d). In  

5.      Aluminium behaves as

    a). metal     b). non metal   c). metalloid   d). transition element

6.       Which of the following elements is most electropositive

a). Al    b). B      c). Ga      d). In

7.        Group-13 elements exhibit

   a).  only +3 oxidation state                  b).   only  +1 oxidation state

    c). Both +1 and +3 oxidation state    d).  +1,  +2 and +3 oxidation state

8.      Which of the following does not contain Al

a). Cryolite         b). Mica      c). Feldspar     d). Fluorospar

9.     The  hydroxide of which of the element is amphoteric

    a). Al(OH)3    b).  B(OH)3     c).  In(OH)3        d). TlOH

10.            the order of increasing strength of BF3, BCl3, BBr3 is

    a). BCl3 > BBr3 > BI3        b). BI3> BCl3> BI3

    b). BBr3> BCl3> BI3          d).  BCl3> BBr3 > BF3

11.               Aluminium chloride exists as

    a).  Monomer     b). Dimer    c). Trimer     d). Polymer

12.  Which of the following does not react with water

a). Al    b). Na     c). B     d). Tl

13.   Which of the following is protected by the layer of its own oxide

            a). Al            b) Fe         c).  Ag       d).  Au

14.   Which of  the following shows inert pair effect

          a).  B    b). Al     c). Tl      d). Si

15.    The stability of + oxidation state increases in the order

   a).  Ga<In<Al<Tl      b). Al<Ga<In<Tl

     c). Tl<In<Ga<Al      d). In<Tl<Ga<Al

16.  Which of the following is used as catalyst in Friedel Crafts reaction

   a). AlCl3     b). BCl3    c). SiCl4        d).   PbCl4   

Boron

17.   Boron behaves as

a). Metal     b). Non-metal    c). Metalloid     d). Transition element

18.   Which of the following Hydride is electron deficient

    a). NaH      b). CaH2      c).   CH4      d). B2H6

19.  Which of the following oxide is acidic

            a). B2O3     b).   Al2O3     c).  Ga2O3   d). In2O3

Some important compounds of boron

20.   B(OH)3 is

a). Monobasic  acid   b). Dibasic acid   c). Tribasic acid  d). Monoacid base

21.    Which is correct about diborane structure

a). All  BHB bonds are equal     b). all H—B bond lengths are equal

 c). it has three 2c—3e bond 

d). All hydrogen and boron atoms are in one plane

22.  The hybridization of boron in diborane is

a). sp-hybridization         b). sp2-hybridisation

c). sp3-hybridisation       d). sp3d2 hybridisation

23.   Boric acid is used in carom boards for smooth gliding of pawns because

a). H3BO3 molecules are loosely chemically bonded  and hence soft

b). its low density make it fluffy  

c). H-bonding in H3BO3 gives it layered structure

24.  The correct formulae of borax is

a). Na2[B4O5(OH)4].8H2O        b). Na2B4O7.4H2O

25. c). Na2[B4O5(OH)4].H2O           d). Na2B4O7.8H

Group-14 Elements

26. Group-14 elements the outermost electronic configuration of group -14 elements is

a). ns² np_x¹ np_y¹ np_z⁰            b). ns² np_x² np_y⁰ np_z⁰

c). ns¹ np_x¹ np_y¹ np_z⁰                  d). ns¹ np_x² np_y¹ np_z⁰

27.  Carbon is typical

   a). metal         b). non-metal   c). Metalloid     ). None of the above

28.   Elements of group -14

     a). Exhibit oxidation state of +4    

    b).  Exhibit oxidation state of +2 and +4

    c) Form M⁺⁴ ions       d). Forms M⁺⁴ and M^—4 ions

   

29.   Silicon has the characteristics of

    a). Metal     b). non-metal    c). Metalloid  d). None of these

30.   Catenation involves

a). Formation of cations     b). Deposition of cations

 c). Formation of long chain of identical atoms 

  d). formation of covalent bonds  

31.   Which element element bond has the highest bond dissociation energy ?

    a).  C—C).         b). Si—Si   c).  Ge—Ge    d). Sn—Sn

32.   Carbon atoms in diamond are arranged in

a). Planar configuration    b). tetrahedral configuration

 c). Linear configuration     d). octahedral configuration

33.  Graphite  is

a). sp3 hybridised       b). sp-hybridised

c). sp2-hybridised        d). none of these

34.  Thermodynamically most stable form of carbon is

a).  diamond    b). Graphite

c). fullerenes     d). coal

35.  Diamond is an example of

    a). ionic crystal        b). covalent crystal  

    c). Ionic crystal          d). Molecular crysta

36.   Carbon has no tendency to form complex compounds because of

   a). its small size    b). the non-availability of d-orbitals

    c). the availability of vacant d-orbitals  

     d). the tendency to form covalent bonds

37.   Inert pair effect is most prominent in

   a). Ge    b). Si  C). Sn   d). Pb

38.  Metallic character of group-14

    a). decreases from top to bottom

     b). Increases from top to bottom

      c). Does not change gradually

       d). has no significance

39.   The type of bonding present in tetravalent compounds of group-14 elements is

a). ionic     b). metallic  c). covalent   d). Hydrogen

40.   The commonly used reducing agent is

a). PbCl2      b). AlCl3   c). SnCl4    d). SnCl2

41.   Dry ice is

         a). Solid NH3      b). Solid CO2   c). Solid N2  d). Solid SO2

42.   Carbon monoxide is

a). acidic     b). neutral   c). amphoteric     d). basic

43.              Carbon in carbon dioxide is

   a). sp3 hybridised       b). sp-hybridised

    c). sp2-hybridised        d). none of these

44.             Silicon is an important constituents of

a). Chlorophyll    b). Haemoglobin

 c). Rocks              d). Amalgams

45.              The structure of SiO₄ ^4—  

a). tetrahedral     b).  triangular  c). Planar    d). Octahedral     

46.             What is the following anion forms the basic structure of silicates

a). SiO₄ ^4—          b).  Si₂O₇^2—           c). (Si₂O₅^2—)n           d). (SiO₃)^2—

47.              Which of the following anions is present chain structure of silicates

   a). SiO₄ ^4—          b).  Si₂O₇^2—           c). (Si₂O₅^2—)n           d). (SiO₃)^2—

48.             Which of the following oxide is acidic

a). SiO2     b). Al2O3    c). CaO    d). Ga2O3

49.             Zeolites are

a). Silicates     b). Aluminosilicates    c). Silicones    d). Sodiumsilicates

50.             Which of the following has honeycomb structure

    a). Silicates   b). Zeolites    c). borates  d). Borazine

51.              Which of the following can form tetrahalides only

a).  C     b). Si,   c). Ge    d). Sn