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

Borax structure contains?
  • two $$BO_{4}$$ groups and two $$BO_{3}$$ groups
  • four $$BO_{4}$$ groups only
  • four $$BO_{3}$$ groups only
  • three $$BO_{4}$$ groups and one $$BO_{3}$$ groups
Match column-I with column-II and mark the appropriate choice.
Column-IColumn-II
PBoraxi$$Na_3AlF_6$$
QInorganic benzeneii$$Na_2B_4O_7.10H_2O$$
RCryoliteiii$$Al_2O_3.2H_2O$$
SBauxiteiv$$B_3N_3H_6$$
  • 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 $$M.P.$$ of $$SnCl_4$$ is less than that of $$SnCl_{2}$$. The suitable reason for the given observation is:
  • There is more charge on $$Sn^{4+}$$
  • The size of $$Sn^{4+}$$ is small
  • Ionic potential of $$Sn^{4+}$$ is high
  • The shape of $$SnCl_{4}$$ is tetrahedral
The correct polymerization tendency order of oxoanions of third period non-metal is:
  • $$Si>P>S>Cl$$
  • $$Cl>S>P>Si$$
  • $$P>Si>Cl>S$$
  • $$S>P>Cl>Si$$
$$\mathrm { SiO } _ { 2 }$$  can react with:
  • $$NaOH$$ only
  • $$HF$$ only
  • Neither $$HF$$ nor $$NaOH$$
  • Both $$HF$$ and $$NaOH$$
Graphite is soft while diamond is hard because:
  • graphite is in powder form.
  • diamond has $$sp^{2}$$- hybridisation but graphite has $$sp^{3}$$-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:
  • $$B < Al < Ga < In$$
  • $$B < Ga < Al < In$$
  • $$B < Al < Ga $$$$ \sim $$$$ In$$
  • $$B < Al $$ $$ \sim $$ $$Ga > In$$
Select correct order:-
  • $$F_2 > Cl_2 > Br_2 > I_2$$ (order of bond energy)
  • $$O > S > Se > Te$$ (Order of tendency of catenation)
  • $$BF_3 > BCl_3 > BBr_3 > BI_3$$ ( Order of lewis acidic strength)
  • $$p-Nitrophenol < o-Nitrophenol$$ (Order of vapour pressure)
The hydridisations of boron in borax are
  • Two borons are $$ sp^2$$  and other two are $$sp^3 $$ hybridised
  • One boron is $$sp^3$$ and three borons are $$sp^3 $$ hybridised
  • Three borons are $$ sp^2$$ and one boron is $$sp^3 $$ hybridised.
  • All are in $$ sp^3 $$ hybridisation.
What is correct statement among the following about the structure of borax molecule?
  • all the four boron atoms are $$s{p^3}$$-hybridized
  • all the four boron atoms are $$s{p^2}$$- hybridized
  • two of the four boron atoms are $$s{p^3}$$-hybridized and the other two are $$s{p^2}$$-hybridized
  • Out of the 10 water molecules generally shown as water of crystallization in its MF,4 molecules of $${H_2}O$$ are really involved in the structural formation
Pick the correct statement :
  • Borax is white crystalline solid containing $$[B_{4}O_{5}(OH)_{4}]^{2-}$$
  • 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
$$(CH_3)_3CCH_2COOH$$ is more acidic than $$(CH_3)_3SiCH_2COOH$$ 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 $$(CH_3)_3SiCH_2COO^-$$ because
  • None of the above
Stability of hydrides of carbon family is in order
  • $${\text{C}}{{\text{H}}_{\text{4}}}{\text{ > Si}}{{\text{H}}_{\text{4}}}{\text{ > Ge}}{{\text{H}}_{\text{4}}}{\text{ > Sn}}{{\text{H}}_{\text{4}}}{\text{ > Pb}}{{\text{H}}_{\text{4}}}$$
  • $${\text{C}}{{\text{H}}_{\text{4}}}{\text{ < Si}}{{\text{H}}_{\text{4}}}{\text{ < Ge}}{{\text{H}}_{\text{4}}}{\text{ < Sn}}{{\text{H}}_{\text{4}}}{\text{ < Pb}}{{\text{H}}_{\text{4}}}$$
  • $${\text{C}}{{\text{H}}_{\text{4}}}{\text{ > Sn}}{{\text{H}}_{\text{4}}}{\text{ > Ge}}{{\text{H}}_{\text{4}}}{\text{ > Si}}{{\text{H}}_{\text{4}}}{\text{ > Pb}}{{\text{H}}_{\text{4}}}$$
  • 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 ($$Si{O}_{4}$$) in silicates
  • They are synthetic polymers containing repeated $${R}_{2}SiO$$ units
  • They are formed by hydrolysis and on subsequent polymerisation of $${R}_{2}Si{Cl}_{2}$$
  • Silicones are used as a lubricants
Which one is non aromatic compound
The number of naturally occurring $$p-block$$ elements, that are diamagnetic is
  • $$7$$
  • $$6$$
  • $$11$$
  • $$5$$
Which of the following does not exist ?
  • $$BiCl_{5 }$$
  • Xe$${ H }_{ 4 }$$
  • $$BiF_{ 5 }$$
  • Both (A) and (B)
Which of the following is more stable?
  • $$Pb^{4+}$$
  • $$Sn^{2+}$$
  • $$Ge^{4+}$$
  • $$Ge^{2+}$$
For which of the following change in Gibbs free energy will be negative?
  • $$ Ge^{+2} \longrightarrow Ge^{+4} $$
  • $$ Pb^{+2} \longrightarrow Pb^{+4} $$
  • $$ Sn^{+4} \longrightarrow Sn^{+2} $$
  • $$ Ga^{+3} \longrightarrow Ga^{+4} $$
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 $$Na_{2}B_{4}O_{7}.10H_{2}O$$ is: 
  • 2
  • 3
  • 4
  • 10
Choose the wrong statement:
  • $$Ge, Sn$$ and $$Pb$$ from $$+2$$ as well as $$+4$$ oxidation state
  • $$Ge^{2+}$$ and $$Sn^{2+}$$ compounds act as reducing agents
  • $$Pb^{4+}$$ compounds act as oxidizing agents
  • Stability increases from $$Ge^{2+}$$ to $$Pb^{2+}$$
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 $$Tl (I)$$
  • $$ SnCl_2 $$ is good oxidizing agent
  • All are correct
Which of the following compounds are the common products obtained in the hydrolysis of $$XeF_6$$ and $$XeF_4$$?
  • $$XeO_2F_2$$
  • $$HF$$
  • $$XeO_3$$
  • Both (A) and (B)
The solution of borax in water is:
  • Neutral
  • Acidic
  • Alkaline
  • Amphoteric
Which of the following is/are example of orthosilicate?
  • $$ ZrSiO_4 $$
  • $$Mg_2SiO_4 $$
  • $$ Zn_3Si_2O_7 $$
  • 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
  • $$P=Na_3,BO_3,Q=Cr(BO_2)_3$$
  • $$P=B_2O_3,Q=CrBO_3$$
  • $$P=Na_2B_4O_7,Q=Cr(BO_2)_3$$
  • $$P=B_2O_3,Q=Cr(BO_2)_3$$
Which of the following elements do not form carbide?
  • $$B$$
  • $$Al$$
  • $$In$$
  • $$Ga$$
$$Me_3SiCl$$ is used during polymerisation of organo silicones because:
  • The chain length of organo silicone polymers can be controlled by adding $$Me_3SiCl$$
  • $$Me_3SiCl$$ blocks the end terminal of silicone polymer
  • $$Me_3SiCl$$ improves the quality and yield of the polymer
  • $$Me_3SiCl$$ 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. $$H_2SO_4$$ is added to a hot concentrated solution of (Y), white crystals of a weak acid separates out. Hence, the compound (Y) is:
  • $$Na_2SO_4.10H_2O$$
  • $$Ca_2P_6O_{11}.10H_2O$$
  • $$Na_2B_6O_{11}$$
  • $$Na_2B_4O_7.10H_2O$$
The incorrect statement/s among the following is/are:
  • $$NCl_5$$ does not exists while $$PCl_5$$ does
  • Lead prefers to form tetravalent compound
  • The three $$C-O$$ bonds are not equal in the carbonate ion
  • Both $${O_2}^{+}$$ and NO are paramagnetic
Among $$Al_2O_3, SiO_2, P_2O_3$$, and $$SO_2$$, the correct order of acid strength is: 
  • $$Al_2O_3 < SiO_2 < SO_2 < P_2O_3$$
  • $$SiO_2 < SO_2 < Al_2O_3 < P_2O_3$$
  • $$SO_2 < P_2O_3 < SiO_2 < Al_2O_3$$
  • $$Al_2O_3 < SiO_2 < P_2O_3 < SO_2$$
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 $$6e^-$$
  • $$Na \xrightarrow{I.E_1} Na^+ \xrightarrow{I.E._2} Na^{2+} \xrightarrow{I.E._3} Na^{3+}$$; 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
  • $$B < Al \sim Ga > In$$
  • $$B < Al < Ga<In$$
  • $$B < Al < Ga \sim In$$
  • $$B < Ga < Al \sim In$$
The number of $$OH$$ units directly linked to boron atoms in $$Na_2B_4O_7 \cdot 10H_2O$$ are:
  • $$2$$
  • $$3$$
  • $$4$$
  • $$10$$
Silica is reacted with sodium carbonate. Which gas liberated?
  • $$CO$$
  • $$O_2$$
  • $$CO_2$$
  • $$O_3$$
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 $$SiO_2$$, 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?
  • $$K$$
  • $$Mg$$
  • $$Al$$
  • $$Pb$$
$${ SiCl }_{ 4 }\xrightarrow [  ]{ { H }_{ 2 }O } X\xrightarrow [  ]{ 1000^0C } Y$$
In the above reaction, $$X$$ and $$Y$$ respectively are:
  • $$SiO_2$$ and $$Si$$
  • $$H_4SiO_4$$ and $$SiO_2$$
  • $$H_2SiCl_6$$ and $$SiO_2$$
  • $$H_4SiO_4$$ and $$Si$$
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