CBSE Questions for Class 11 Engineering Chemistry Some P-Block Elements Quiz 14 - MCQExams.com

Borax structure contains?
  • two BO4BO4 groups and two BO3BO3 groups
  • four BO4BO4 groups only
  • four BO3BO3 groups only
  • three BO4BO4 groups and one BO3BO3 groups
Match column-I with column-II and mark the appropriate choice.
Column-IColumn-II
PBoraxiNa3AlF6Na3AlF6
QInorganic benzeneiiNa2B4O7.10H2ONa2B4O7.10H2O
RCryoliteiiiAl2O3.2H2OAl2O3.2H2O
SBauxiteivB3N3H6B3N3H6
  • P-ii, Q-iv, R-i, S-iii
  • P-i, Q-ii, R-iii, S-iv
  • P-ii, Q-iii, R-i, S-iv
  • P-ii, Q-i, R-iv, S-iii
The M.P.M.P. of SnCl4SnCl4 is less than that of SnCl2SnCl2. The suitable reason for the given observation is:
  • There is more charge on Sn4+Sn4+
  • The size of Sn4+Sn4+ is small
  • Ionic potential of Sn4+Sn4+ is high
  • The shape of SnCl4SnCl4 is tetrahedral
The correct polymerization tendency order of oxoanions of third period non-metal is:
  • Si>P>S>ClSi>P>S>Cl
  • Cl>S>P>SiCl>S>P>Si
  • P>Si>Cl>SP>Si>Cl>S
  • S>P>Cl>SiS>P>Cl>Si
SiO2SiO2  can react with:
  • NaOHNaOH only
  • HFHF only
  • Neither HFHF nor NaOHNaOH
  • Both HFHF and NaOHNaOH
Graphite is soft while diamond is hard because:
  • graphite is in powder form.
  • diamond has sp2sp2- hybridisation but graphite has sp3sp3-hybridisation.
  • graphite is in planar form while diamond is in tetrahedral form.
  • graphite is covalent and diamond is ionic.
The correct order of atomic radii of group 13 elements is:
  • B<Al<Ga<InB<Al<Ga<In
  • B<Ga<Al<InB<Ga<Al<In
  • B<Al<GaB<Al<GaInIn
  • B<AlB<Al Ga>InGa>In
Select correct order:-
  • F2>Cl2>Br2>I2F2>Cl2>Br2>I2 (order of bond energy)
  • O>S>Se>TeO>S>Se>Te (Order of tendency of catenation)
  • BF3>BCl3>BBr3>BI3 ( Order of lewis acidic strength)
  • pNitrophenol<oNitrophenol (Order of vapour pressure)
The hydridisations of boron in borax are
  • Two borons are sp2  and other two are sp3 hybridised
  • One boron is sp3 and three borons are sp3 hybridised
  • Three borons are sp2 and one boron is sp3 hybridised.
  • All are in sp3 hybridisation.
What is correct statement among the following about the structure of borax molecule?
  • all the four boron atoms are sp3-hybridized
  • all the four boron atoms are sp2- hybridized
  • two of the four boron atoms are sp3-hybridized and the other two are sp2-hybridized
  • Out of the 10 water molecules generally shown as water of crystallization in its MF,4 molecules of H2O are really involved in the structural formation
Pick the correct statement :
  • Borax is white crystalline solid containing [B4O5(OH)4]2
  • Aqueous solution of borax is acidic in nature.
  • Cobalt gives green colour in borax bead test.
  • All are incorrect.
Which of the following oxidation states are the most characteristic for lead and tin? 
  • +2,+2
  • +4,+2
  • +2,+4
  • +4,+4
Which of the following statement is wrong regarding borax?
  • Alkaline solution is formed when barox is dissolved in water
  • Each boron atom is borax ,olecular is bonded to four oxygen atoms
  • Borax is used a buffer
  • Geometry around two B atoms is triangular while it is tetrahedral around the other two units
(CH3)3CCH2COOH is more acidic than (CH3)3SiCH2COOH because :
  • Size of Si is more than that of carbon
  • Electronegativity of carbon is less than that of silicon
  • Silicon is more electropositive than carbon due to which (CH3)3SiCH2COO because
  • None of the above
Stability of hydrides of carbon family is in order
  • CH4 > SiH4 > GeH4 > SnH4 > PbH4
  • CH4 < SiH4 < GeH4 < SnH4 < PbH4
  • CH4 > SnH4 > GeH4 > SiH4 > PbH4
  • None of these
The most abundant IVA group elements in the earth's crust is 
  • Germanium
  • Carbon
  • Silicon
  • Tin
Which is incorrect statement about silicones?
  • They are repeating units (SiO4) in silicates
  • They are synthetic polymers containing repeated R2SiO units
  • They are formed by hydrolysis and on subsequent polymerisation of R2SiCl2
  • Silicones are used as a lubricants
Which one is non aromatic compound
The number of naturally occurring pblock elements, that are diamagnetic is
  • 7
  • 6
  • 11
  • 5
Which of the following does not exist ?
  • BiCl5
  • XeH4
  • BiF5
  • Both (A) and (B)
Which of the following is more stable?
  • Pb4+
  • Sn2+
  • Ge4+
  • Ge2+
For which of the following change in Gibbs free energy will be negative?
  • Ge+2Ge+4
  • Pb+2Pb+4
  • Sn+4Sn+2
  • Ga+3Ga+4
Total number of sigma bonds formed by all the boron atoms in borax is
  • 14
  • 4
  • 9
  • 7
In which of the following element +1 oxidation state is more stable ?
  • B
  • Al
  • Ga
  • Tl
The number of OH units directly linked to boron atoms in Na2B4O7.10H2O is: 
  • 2
  • 3
  • 4
  • 10
Choose the wrong statement:
  • Ge,Sn and Pb from +2 as well as +4 oxidation state
  • Ge2+ and Sn2+ compounds act as reducing agents
  • Pb4+ compounds act as oxidizing agents
  • Stability increases from Ge2+ to Pb2+
Aluminium exist in +3 state where as thallium exist in both +1 & +3 oxidation state. Reason for this is
  • inert pair effect
  • Lanthanoid contraction
  • Diagonal relationship
  • none of these
Which of the following silicate is called disilicate?
  • Orthosilicate
  • Pyrosilicate
  • Single -chain silicate
  • None of these
Select the correct statements :
  • The +1 oxidation compared to the +3 oxidation state gets gradually more stabilized as we move from top to bottom in III group
  • Tl(III) being unstable, acts as a good oxidizing agent to get reduced to Tl(I)
  • SnCl2 is good oxidizing agent
  • All are correct
Which of the following compounds are the common products obtained in the hydrolysis of XeF6 and XeF4?
  • XeO2F2
  • HF
  • XeO3
  • Both (A) and (B)
The solution of borax in water is:
  • Neutral
  • Acidic
  • Alkaline
  • Amphoteric
Which of the following is/are example of orthosilicate?
  • ZrSiO4
  • Mg2SiO4
  • Zn3Si2O7
  • Asbsetos
Carbon black is obtained when methane is :
  • heated in absense of air
  • heated in presence of nitrogen
  • heated in presence of ammonia
  • heated with steam
Single Correct Answer Type
Consider the given sequence of reaction and identify
P and Q:
Q (Green colored)
1726538_4a1bf085513f4aa3b9186022427dec2b.JPG
  • P=Na3,BO3,Q=Cr(BO2)3
  • P=B2O3,Q=CrBO3
  • P=Na2B4O7,Q=Cr(BO2)3
  • P=B2O3,Q=Cr(BO2)3
Which of the following elements do not form carbide?
  • B
  • Al
  • In
  • Ga
Me3SiCl is used during polymerisation of organo silicones because:
  • The chain length of organo silicone polymers can be controlled by adding Me3SiCl
  • Me3SiCl blocks the end terminal of silicone polymer
  • Me3SiCl improves the quality and yield of the polymer
  • Me3SiCl acts as a catalyst during polymerisation
Borax on heating strongly above its melting point melts to a liquid, which then solidifies to a transparent mass commonly known as borax-bead. The transparent glassy mass consists of:
  • Sodium pyroborate
  • Boric anhydride
  • Sodium meta-berate
  • Boric anhydride and sodium metaborate
An element belongs to 3rd period and group -13 of the periodic table. Which of the following properties will be shown by the elements?
  • Good conductor of electricity
  • Liquid, Metallic
  • Solid, metallic
  • Solid, Non - metallic
Aqueous solution of a salt (Y) is alkaline to litmus. On strong heating, it swells-up to give a glassy material. When conc. H2SO4 is added to a hot concentrated solution of (Y), white crystals of a weak acid separates out. Hence, the compound (Y) is:
  • Na2SO4.10H2O
  • Ca2P6O11.10H2O
  • Na2B6O11
  • Na2B4O7.10H2O
The incorrect statement/s among the following is/are:
  • NCl5 does not exists while PCl5 does
  • Lead prefers to form tetravalent compound
  • The three CO bonds are not equal in the carbonate ion
  • Both O2+ and NO are paramagnetic
Among Al2O3,SiO2,P2O3, and SO2, the correct order of acid strength is: 
  • Al2O3<SiO2<SO2<P2O3
  • SiO2<SO2<Al2O3<P2O3
  • SO2<P2O3<SiO2<Al2O3
  • Al2O3<SiO2<P2O3<SO2
Which element exhibits both +1 and +3 oxidation numbers in its compounds?
  • B
  • Be
  • Sn
  • Tl
Select the incorrect statement(s): 
  • p-orbital can accommodate 6e
  • NaI.E1Na+I.E.2Na2+I.E.3Na3+; the correct order of ionization energy is I.E.2>I.E.3>I.E.1
  • Xe is a noble gas
  • B is a non-metal
The correct order of atomic radii of group 13 elements is
  • B<AlGa>In
  • B<Al<Ga<In
  • B<Al<GaIn
  • B<Ga<AlIn
The number of OH units directly linked to boron atoms in Na2B4O710H2O are:
  • 2
  • 3
  • 4
  • 10
Silica is reacted with sodium carbonate. Which gas liberated?
  • CO
  • O2
  • CO2
  • O3
The blue coloured mineral 'Lapis Lazuli' which is used as a semi-precious stone is a mineral of the following class:
  • sodium alumino silicate
  • zinc cobaltate
  • basic copper carbonate
  • prussian blue
In silica SiO2, each silicon atom is bonded to:
  • two oxygen atoms
  • four oxygen atoms
  • one silicon and two oxygen atoms
  • one silicon and four oxygen atoms
Which is likely to show inert pair effect?
  • K
  • Mg
  • Al
  • Pb
SiCl4H2OX10000CY
In the above reaction, X and Y respectively are:
  • SiO2 and Si
  • H4SiO4 and SiO2
  • H2SiCl6 and SiO2
  • H4SiO4 and Si
0:0:2


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