CBSE Questions for Class 11 Engineering Chemistry Some P-Block Elements Quiz 13 - MCQExams.com

Borax is used as a buffer since-
  • Its aqueous solution contains equal amount of weak acid and its salt.
  • It is easily available.
  • Its aqueous solution contains equal amount of strong acid and its salt.
  • Statement that borax is a buffer, is wrong.
When borax is dissolved in water :
  • $$ B(OH)_3 $$ is formed only
  • $$ [B(OH)_4]^- $$ is formed only
  • Both $$ B(OH)_3 $$ and $$ [B(OH)_4]^- $$ are formed
  • $$ [B_3O_3(OH)_4]^- $$ is formed only
Electronic configuration of only one p-block element is exceptional. One molecule of that element consists of how many atoms of it?
  • One
  • Two
  • Three
  • Four
The following element forms a molecule with eight of its own atoms:
  • $$Si$$
  • $$S$$
  • $$Cl$$
  • $$P$$
Which of the following product is formed when $$SiF_4$$ reacts with water?
  • $$SiF_3$$
  • $$H_4SiO_4$$
  • $$H_2SO_4$$
  • $$H_2SiF_4$$
The ground glass stopper is often seen to get stuck in the neck of glass bottles containing aq $$NaOH$$ solution This is due to: 
  • formation of solid $$\displaystyle Na_{2}CO_{3}$$ around the neck of the bottle due to NaoH reacting with atmospheric $$\displaystyle CO_{2}$$
  • formation of solid $$\displaystyle Na_{2}SiO_{3}$$ around the neck of the bottle
  • creation of partial vacuum due to highly hygroscopic nature of $$NaOH$$
  • high coefficient of thermal expansion of glass
Stannite is an ore of __________.
  • tin
  • lead
  • germanium
  • carbon
Which of the following electrolytes is least effective in causing flocculation of ferric hydroxide sol?
  • $$K_{3}[Fe(CN)_{6}]$$
  • $$K_{2}CrO_{4}$$
  • $$KBr$$
  • $$K_{2}SO_{4}$$
The hydrides of the first elements in groups 15 - 17, namely $$N{H}_{3}, {H}_{2}O$$ and $$HF$$ respectively, show abnormally high values for melting and boiling points. This is due to:
  • small size of $$N, O$$ and $$F$$
  • the ability to form extensive intermolecular $$H$$-bonding
  • the ability to form extensive intramolecular $$H$$-bonding
  • effective van der Waal's interaction
Quartz, $$\displaystyle Si{ O }_{ 2 }$$, which is insoluble in most of the solvent with a high melting point. Which type of force best describe the physical properties of quartz?
  • Hydrogen bonding
  • Covalent bonding
  • Ionic bonding
  • $$P$$ bonding
  • Dispersion forces
Group 13 elements are attacked by non-oxidising acids except:
  • aluminium
  • gallium
  • indium
  • boron
$$Me_2SiCl_2$$ on hydrolysis will produce :
  • $$(Me)_2Si(OH)_2$$
  • $$(Me)_2Si=O$$
  • $$[-O-(Me)_2Si-O-]_n$$
  • $$Me_2 SiCl(OH)$$
In borax the number of $$B-O-B$$ links and $$B-OH$$ bonds present are respectively:
  • five and four
  • four and five
  • three and four
  • five and five
The correct increasing order of the stability of $$Al^+,\,Ga^+,\,In^+,\,Tl^+$$ ions are:
  • $$Al^+\, <\,Ga^+\, <\,Tl^+\, <\,In^+$$
  • $$Al^+\, <\,Ga^+\, <\,In^+\, <\,Tl^+$$
  • $$Tl^+\, <\,In^+\, <\,Ga^+\, <\,Al^+$$
  • $$Tl^+\, <\,Al^+\, <\,Ga^+\, <\,In^+$$
The compound that will react most readily with gaseous bromine has the formula is:
  • $$C_4H_{10}$$
  • $$C_2H_4$$
  • $$C_3H_6$$
  • $$C_2H_2$$
Kieselguhr contains :
  • carbon
  • silicon
  • boron
  • iodine
The number of oxygen atoms shared per $$SiO_{4}^{4-}$$ tetrahedron in the following are:
I. Two-dimensional sheet structured silicates
II. Cyclic silicates and
III. Single strand chain silicates 
  • $$3, 3, 2$$
  • $$3, 2, 2$$
  • $$4, 3, 1$$
  • $$4, 3, 2$$
Which of the following compounds undergo disproportionation in aqueous solution?
  • $$TlCl_3$$
  • $$GaCl$$
  • $$InCl$$
  • $$TlCl$$
$$(i)$$Its aqueous solution is alkaline to litmus.
$$(ii)$$ It swells up to glassy material $$Y$$ on strong heating.
$$(iii)$$When the concentrated solution of sulphuric acid is added to a hot solution of $$X$$.white crystal of an acid $$Z$$ separates out.

The Compound $$Y$$ is :
  • sodium borate & boric oxide
  • flower of sulphur
  • bleaching powder
  • none of these
The reason(s) for small radius of $$Ga$$ compared to $$Al$$ is/are :
  • poor screening effect of $$d$$ and $$f$$ orbitals.
  • increase in nuclear charge
  • presence of higher orbital
  • higher atomic number
Read the following statements and identify compound $$Z$$
$$(i)$$Its aqueous solution is alkaline to litmus.
$$(ii)$$ It swells up to glassy material $$Y$$ on strong heating.
$$(iii)$$When the concentrated solution of sulphuric acid is added to a hot solution of $$X$$.white crystal of an acid $$Z$$ separates out.
  • hydrochloric acid
  • boric acid
  • sulphuric acid
  • none of these
Element showing the phenomenon of allotropy is:
  • $$Al$$
  • $$Pb$$
  • $$Sn$$
  • $$Cu$$
The element that forms stable compounds in low oxidation state is:
  • $$Mg$$
  • $$Al$$
  • $$Ga$$
  • $$Tl$$
$$CH_3CH=\overset{\overset{\displaystyle CH_3}{|}}{C}CH_3$$ changes to __________ in hydroboration-oxidation reaction.
  • $$CH_3\underset{\underset{\displaystyle OH}{|}}{C}H\underset{\underset{\displaystyle CH_3}{|}}{C}HCH_3$$
  • $$CH_3CH_2\overset{\overset{\displaystyle OH}{|}}{\underset{\underset{\displaystyle CH_3}{|}}{C}}CH_3$$
  • $$CH_3CH_2\underset{\underset{\displaystyle CH_3}{|}}{C}HCH_2OH$$
  • none of these
Pick out the wrong statement.
  • Nitrogen has the ability to form $$p\pi -p\pi $$ bonds with itself
  • Bismuth forms metallic bonds in elemental state
  • Catenation tendency is higher in nitrogen when compared with other elements of the same group
  • Nitrogen has higher first ionization enthalpy when compared with other elements of the same group
  • Arsenic forms $$d\pi -d\pi $$ bonds with transition metals
$$(Me)_2SiCl_2$$ on hydrolysis will produce.
  • $$(Me)_2Si(OH)_2$$
  • $$(Me)_2Si=O$$
  • $$[-O-Me_2(Si-O-)]_n$$
  • $$Me_2Si(Cl)(OH)$$
In the structure of borax, the numbers of boron atoms and B-O-B units, respectively, are :
  • 4 and 5
  • 4 and 3
  • 5 and 4
  • 5 and 3
The anion which cannot be formed by boron is:
  • $$B{ F }_{ 6 }^{ 3- }$$
  • $$B{ H }_{ 4 }^{ - }$$
  • $$B{ \left( OH \right) }_{ 4 }^{ - }$$
  • $$B{ O }_{ 2 }^{ - }$$
$$1^\circ$$ alcohols preferably undergo dehydration in presence of $$Al_{2}O_{3}$$:
  • $$E_{1}$$
  • $$E_{2}$$
  • $$S_{N}1$$
  • $$S_{N}2$$
Match the column I with column II and mark the appropriate choice
Column IColumn II
$$(A)$$ Boron fibres$$(i)$$ Heat resistant glasses
$$(B)$$ Borax$$(ii)$$ Bulletproof vest
$$(C)$$ Aluminium $$(iii)$$ Filler in automobile tyre
$$(D)$$ Carbon black$$(iv)$$ Transport industry
  • $$(A)\rightarrow (i),(B)\rightarrow (ii),(C)\rightarrow (iii),(D)\rightarrow (iv)$$
  • $$(A)\rightarrow (ii),(B)\rightarrow (i),(C)\rightarrow (iv),(D)\rightarrow (iii)$$
  • $$(A)\rightarrow (ii),(B)\rightarrow (iii),(C)\rightarrow (i),(D)\rightarrow (iv)$$
  • $$(A)\rightarrow (iii),(B)\rightarrow (ii),(C)\rightarrow (i),(D)\rightarrow (iv)$$
Which of the following statements is incorrect for following species:

$$BO_3^{3-}, \, CO_3^{2-}, \, NO_3^-$$
  • They are isoelectronic and isostructural.
  • They have same bond order for E-O bond, where E is the central atom.
  • The extent of $$\pi$$-bonding is in the order of $$CO_3^{2-} \, < \, NO_3^- \, < \, BO_3^{3-}$$
  • Bond angles are same in every cases.
Hydrolysis of $$SiCl_4$$ gives ?
  • $$Si(OH)_4$$
  • $$SiOCI_2$$
  • $$SiO_2$$
  • $$H_2SiO_4$$
List-I (ppt)List-II (colour)
(P)$${ Ag }_{ 2 }Cr{ O }_{ 4 }$$(1)Yellow
(Q)$${ Cu }_{ 2 }\left[ Fe{ \left( CN \right)  }_{ 6 } \right] $$(2)White
(R)$$Ba{ SO }_{ 4 }$$(3)Chocolate brown
(S)$$Pb{ I }_{ 2 }$$(4)Scarlet Red
  • $$P-4, Q-2, R-1, S-3$$
  • $$P-2, Q-3, R-4, S-1$$
  • $$P-4, Q-3, R-2, S-1$$
  • $$P-3, Q-4, R-1, S-2$$
Product (A) and (B) in above reaction is :
991887_4a4dcb3c314e470681813ebdc9333ec4.png
  • $$O^--\overset{O}{\overset{||}{S}}-O-H, \, O^--\overset{O}{\overset{||}{S}}-O-CH_3$$
  • $$O^--\overset{O}{\overset{||}{S}}-O-H, \,\, O^--\underset{O^-}{\underset{|}{\overset{O}{\overset{||}{S_{\bigoplus}}}}}-O-CH_3$$
  • $$O^--\overset{O}{\overset{||}{S}}-O-CH_3, \,\, O^\ominus-\underset{CH_3}{\underset{|}{\overset{O}{\overset{||}{S_{\bigoplus}}}}}-H$$
  • d$$O^--\underset{H}{\underset{|}{\overset{O}{\overset{||}{S_{\bigoplus}}}}}-O, \,\, O^--\underset{CH_3}{\underset{||}{\overset{O}{\overset{||}{S}}}}-O^-$$
What happens when silicon is heated with methyl chloride in presence of copper as a catalyst at 573K? 
  • Methyl substituted chlorosilanes are formed
  • Only $$Me_4$$ Si is formed
  • Polymerised chains of $$(CH_3)_3SiCl$$ are formed
  • Silicones are formed
Under hydrolytic condition, the compounds used for preparation of linear polymer and for chain termination, respectively, are:
  • $$CH_3SiCl_3$$ and $$Si(CH_3)_4$$
  • $$(CH_3)_2SiCl_2$$ and $$(CH_3)_3SiCl$$
  • $$(CH_3)_2SiCl_2$$ and $$CH_3SiCl_3$$
  • $$SiCl_4$$ and $$(CH_3)_3SiCl$$
Which of the following is the correct statement about silicones?
  • They are made up of $$SiO_4^{4-}$$ units.
  • They are polymers made up of $$R_2SiO$$ units.
  • They are water soluble compounds.
  • They are hydrophillic in nature.
Which of the following compounds have zero dipole moment ?
  • $$BF_3$$
  • $$SnCl_2$$
  • $$H_2O$$
  • $$NH_3$$
Which order of boiling point is correct?
  • $$He < Ne < Ar < O_{2} < N_{2}$$
  • $$He < Ne < N_{2} < Ar < O_{2}$$
  • $$He < Ne < N_{2} < O_{2} < Ar$$
  • $$He < Ar < N_{2} < Ne < O_{2}$$
How many derivate structures of $${B}_{3}{N}_{3}{H}_{4}{X}_{2}$$ can be derived from the basic structure by the replacement of two hydrogen atoms?
1147488_b0288ad8e0344f939d2384f5a2686e11.PNG
  • $$2$$
  • $$3$$
  • $$4$$
  • $$5$$
Diborane on reaction with oxygen gives a boron compound A.'A' can also be obtained by strongly heating:
  • $${ H }_{ 2 }{ BO }_{ 2 }$$
  • $${ BCl }_{ 3 }$$
  • $${ NaBH }_{ 4 }$$
  • $${ B }_{ 3 }{ N }_{ 3 }{ H }_{ 6 }$$
In silicon dioxide
  • there are double bonds between silicon and oxygen atoms
  • silicon atom is bonded to two oxygen atoms
  • each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms
  • each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms.
Super conductors are derived from compounds of:
  • p-block elements
  • lanthanides
  • actinides
  • transition elements
Which of the following anion is present in chain structure of silicate?
  • $${ [{ Si }_{ 2 }{ O }_{ 5 }^{ 2- }] }_{ n }$$
  • $${ [{ Si }{ O }_{ 3 }^{ 2- }] }_{ n }$$
  • $${ { Si }{ O }_{ 4 }^{ 4- } }$$
  • $${ { { Si }_{ 2 } }{ O }_{ 7 }^{ 6- } }$$
Most stable oxidation state of gold is: 
  • +1
  • +3
  • +2
  • 0
Heating of ammonium dichromate  produces all these compounds except:
  • NH$$_{3}$$
  • H$$_{2}$$O
  • N$$_{2}$$
  • Cr$$_{2}$$O$$_{3}$$
When Borax is heated with solid salt metal metaborate is produced. Which of the following reaction actually involve the metal metaborate formation?
  • Acid base reaction between metal oxide and $$B_2O_3$$
  • Oxidation reduction reaction between metal oxide and $$B_2O_3$$
  • Substitution reaction between $$NaBO_2$$ & metal oxide
  • Complex formation reaction between metal oxide and $$B_2O_3$$
The oxidation state of the most electronegative element in the products of the reaction $${ BaO }_{ 2 }$$ with $${ H }_{ 2 }{ SO }_{ 4 }$$ are :
  • 0 and -1
  • -2 and +1
  • -1 and -2
  • -2 and 0
In which of the following compounds $$B-F$$ bond length is shortest?
  • $${ BF }_{ 4 }^{ - }$$
  • $$BF_3$$ $$\leftarrow $$ $$NH_3$$
  • $$BF_3$$
  • $$BF_3$$ $$\leftarrow $$ $$N(CH_3)_{3}$$
Which is/are true statements among the following 
  • $$PH_5, SCl_6$$ and $$FCl_3$$ do not exist.
  • $$p\pi - d\pi$$ bonds are present in $$SO_2$$ molecule.
  • $$ 12$$ $$P-O$$ bonds are present in $$P_4O_6$$ molecule.
  • Cation of $$PCl_5(s)$$ has tetrahedral shape.
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