CBSE Questions for Class 11 Engineering Chemistry Some P-Block Elements Quiz 3 - MCQExams.com

Hydrolysis of $$SiCl_{4}$$ gives compound $$X$$ and $$HCl$$. On heating to $$1000^{\circ}$$ $$C$$. $$X$$ loses water and forms $$Y$$. Identify $$X$$ and $$Y$$ respectively.
  • $$SiO_{2}$$ and $$Si$$
  • $$H_{4}SiO_{4} $$ and $$SiO_{2}$$
  • $$SiO_{2}$$ and $$SiC$$
  • $$H_{4}SiO_{4}$$ and $$Si$$
Which of the following Si biocompatible
  • Silicone
  • Polythene
  • Teflon
  • Bakelite
Silica reacts with a hydride of superhalogen to form 'X'. On hydrolysis of 'X', another compound 'Y' is formed. 'Y' on heating at 1000$$^0$$C loses water to form 'Z'. The 'Z' can also be prepared by the reaction
  • $$SiO_{2}+4HF\rightarrow SiF_{2}+ 2H_{2}O$$
  • $$Si+O_{2}\rightarrow SiO_{2}$$
  • $$K_{2}SiF_{6}\rightarrow 6KF+Si$$
  • $$Si+2NaOH+H_{2}\rightarrow Na_{2}SiO_{3}+2H_{2}$$
The high melting point of $$ SiO_{2}$$ is due to:
  • $$sp$$ hybridised silicon atom
  • tetrahedral polymer structure
  • its solid state
  • $$Sp^{2}$$ hybridised silicon atom
Which of the following bonds is present in silicone ?
  • $$Si-O-Si-O-Si$$
  • $$Si-C-Si-O-Si$$
  • $$Si-O-Si-C-Si$$
  • $$Si-Si-Si-Si-Si$$
A. $$CCl_{4}$$ does not act as lewis acid. 
B. Silanes are strong reducing agents.
C. Crystalline silica will have Diamond like structure.
Which of the above statement(s) is/are true?
  • A & B
  • only 'A'
  • only 'B'
  • A, B & C
The most abundant metal among the following is:
  • $$Al$$
  • $$Ca$$
  • $$Fe$$
  • $$K$$
List -I                                                  List -2
Arrange properly.
A. Diamond                                       Metal electrode
B. Graphite                                        sp hybridized
C. Silica                                             Acheson's process
D. $$CO_2 $$                                             Agate
                                                         Cutting of glass
The correct match is?
  • 2 1 3 4
  • 5 1 2 3
  • 5 3 4 2
  • 1 4 2 3
Assertion (A) : Silica is less harder than diamond .
Reason (R) : Silica has only two dimensional network .
  • Both A and R are true and R is correct

    explanation of A
  • Both A and R are true and R is not correct

    explanation of A
  • A is true but R is false
  • A is false but R is true.
 Decreasing order of p-orbital character in the following is:
A) $$ SiO_{2}$$        B) $$ CO_{2}$$        C) Graphite
  • A>B>C
  • B>A>C
  • B>C>A
  • A>C>B
$$SiF_{4} + H_{2} O \rightarrow A \xrightarrow {1000^oC} B \xrightarrow {Na_{2}CO_{3}} C$$

In the above reaction, identify B and C respectively :
  • $$H_{4}SiO _{4}$$ and $$Na _{2} SiO_{3}$$
  • $$SiO _{2}$$ and $$Na _{2} S$$
  • $$SiO_{2}$$ and $$Na _{2}CO _{2}$$
  • $$SiO _{2}$$ and $$Na _{2} SiO_{3}$$
Arrange the group 14 elements in the order of decreasing ionisation energies.
  • C > Si > Ge > Pb > Sn
  • C > Si > Ge > Sn > Pb
  • C > Ge > Sn > Pb>Si
  • Si > C > Ge > Sn > Pb
Which of the following is wrong about silica?
  • Purest form of silica is know as quartz.
  • Quartz is also know as rock crystal.
  • Quartz contain hexagonal prisms.
  • U.V. light cannot pass through quartz.
A. Silanes are good reducing agents.
B. $$SiO _{2}$$ is a giant tetrahedral polymer.
C. $$SnCl_{4}$$ acts as bronsted base.
The correct option is :
  • A and B are true
  • B and C are true
  • only C is true
  • all are true

STATEMENT-1 : $$SiO_{2}$$ is used as an acidic flux in metallurgy.
STATEMENT-2 : $$SiO_{2}$$ removes basic impurities forming a slag.
  • STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
  • STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
  • STATEMENT-1 is True, STATEMENT-2 is False
  • STATEMENT-1 is False, STATEMENT-2 is True
A. Graphite acts as lubricant due to layer like structure.
B. The distance between two layers in graphite is $$1.42^{\circ}A$$.
C. Silica does not react with HCl, HBr and Hl.
Which of the above statement(s) is/are true?
  • A & C
  • A & B
  • only 'A'
  • A, B & C
Which of the following statements are true about quartz?
A. it is pure crystalline form of silica.
B. it is a tetrahedral polymer of $$SiO_{2}$$.
C. UV light can pass through quartz.
  • A and B are correct
  • B and C are correct
  • A and C are correct
  • all are correct
Anhydrous borax is:
  • $$Na_{2}B_{4}O_{7}$$
  • $$Na_{2}B_{4}O_{7}\, .\: 5H_{2}O$$
  • $$Na_{2}B_{4}O_{7}\,. 10H_{2}O$$
  • $$Na_{2}B_{4}O_{7}.8H_{2}O$$
Borax is known as :
  • Sodium borate.
  • Sodium tetra borate.
  • Disodium tetra borate.
  • All
In the aluminothermic process, aluminium acts as:
  • an oxidising agent
  • a.flux
  • a reducing agent
  • a solder
Borax is the sodium salt of:
  • Ortho boric acid.
  • Meta boric acid.
  • Tetra boric acid.
  • Pyro boric acid.
Match the List-I with List-II.

   List -I                                             List -II
a) Phosgene                             p) Sodium silicate
b) Water glass                          q) A poisonous gas
c) Carbon monoxide                r) Fire extinguisher
d) Carbon dioxide                    s) Carbonyl ligand
  • a-q;  b-p;  c-s;  d-r
  • a-r;  b-q;  c-r;  d -p,q
  • a-s;  b-p;  c-q;  d-r,
  • a-r;  b-s;  c-q;  d-p
Match list I and list II.
List -I                                    List -2
A)$$ SiCl_{4}$$                              1)  $$ SiO_{2}$$                     
B) Tetrahedral                     2)  Acid-flux             
C) Acheson's process         3) Lewis Acid
D) $$ SiO_{2}$$                               4) Silicon 
                                              5)Graphite
  • 1 2 4 3
  • 5 1 2 4
  • 3 1 5 2
  • 3 2 4 1
The form of $$SiO_{2}$$ used as piezoelectric material :
  • cristobalite
  • quartz
  • kiesulguhr
  • silica gel
The material used in solar cell contains :
  • Cs
  • Si
  • Sn
  • T
 List -I                                                          List -2
A. The purest form of  $$SiO_{2}$$                        Quartz 
B. Carborundum                                           Graphite
C. Corundum                                                 $$SiC$$
D. Hexagonal rings                                       $$ Al_{2} O_{3}$$
                                                                        Diamond 

Correct match with A B C D is:
  • 1 3 4 2
  • 3 1 4 2
  • 1 3 2 4
  • 3 1 4 3
List -I                                                        List -2
A. Reactive form of Carbon                      HF
B. Acid employed for                                Diamond
etching of glass
C. Synthesis gas                                       Charcoal
D. Unreactive form of Carbon                  $$CO   H_{2}$$     
The correct match with A B C D is ?
  • 1 2 3 4
  • 2 4 3 1
  • 2 1 3 4
  • 3 1 4 2
Which of the following does not exhibit inert pair effect?
  • Bi
  • Pb
  • B
  • Tl
Among III-A group elements, the elements with highest and lowest I.P. values are:
  • B, Tl
  • B, In
  • B, Al
  • B, Ga
Element with a giant molecular structure is:
  • B
  • Al
  • Ga
  • Tl
Sources of Boron are:
  • Kernite
  • Borax
  • Colemanite
  • $$B_{2}O_{3}$$
The compounds of boron are :
  • mostly ionic
  • mostly covalent
  • both
  • crystalline
Which of the following is the correct formulae of
borax ?
  • $$Na[B_{4}O_{5}\left ( OH \right )_{4}].2H_{2}O$$
  • $$Na[B_{4}O_{5}\left ( OH \right )_{4}].4H_{2}O$$
  • $$Na[B_{4}O_{5}\left ( OH \right )_{4}].6H_{2}O$$
  • $$Na_{2}[B_{4}O_{5}\left ( OH_{} \right )_{4}].8H_{2}O$$
Bauxite is an oxide mineral of:
  • barium
  • boron
  • bismuth
  • aluminium
Assertion (A) : Thallium compounds are stable in +1 oxidation state.
Reason (R) : The $$6s^{2}$$ electrons in Tl show reluctance in participating in bond formation.
  • Both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • Both Assertion and Reason are true and Reason is not the correct explanation of Assertion
  • Assertion is true but Reason is false
  • Assertion is false but Reason is true.
The electro-positive character increases from B to Al and then decreases from Al to Tl because of:
  • decrease in ionization energy of the elements
  • increase in size of the elements
  • ineffective shielding of nuclear charge by d-electrons in case of Ga, In and Tl
  • decrease in electronegativity of the elements
Which of the following property does not support anamolous behaviour of boron?
  • Small size
  • High electronegativity
  • High ionization energy
  • Formation of trihalides
Identify the compound $$A$$ in the reaction given below.
$$Na_{2}B_{4}O_{7}+2H_{2}O\rightarrow 2NaOH+A$$ 
  • Orthoboric acid
  • Metaboric Acid
  • Tetraboric Acid
  • Pyroboric acid
The aqueous solution of borax turns red litmus to:
  • blue
  • No Change
  • red
  • white
Aqueous solution of borax is _______ in nature.
  • Neutral
  • Acidic
  • Alkaline
  • None
Which of the following reaction will yield crystalline variety of boron?
  • $$ B_{2}O_{3}+2Al$$
  • $$BCl_{3}\: +H_{2}$$
  • $$B_{2}O_{3}+3Mg$$
  • $$2B+3MgO$$
Which of the following elements can present both in cation and anion of its salts?
  • $$B$$
  • $$Al$$
  • $$Ga$$
  • $$Tl$$
An element R belongs to III A group. Which is true with respect to R?
  • It is a gas at room temperature
  • It has an oxidation state of +4
  • It forms an oxide of the type $$R_{2}\, O_{3}$$
  • It forms a halide of the type $$Rx_{2}$$
Which of the following metal forms a protective oxide layer to prevent corrosion? 
  • $$Cu$$
  • $$Mg$$
  • $$Al$$
  • $$Mn$$
When borax is heated strongly it gives:
  • $$B_{2}O_{3}$$
  • $$Na_{2}B_{4}O_{7}$$
  • $$NaBO_{2}+B_{2}O_{3}$$
  • none of the above
$$AlO^{-}_{2}$$ ion in aqueous solution exists as :
  • $$[Al\left ( OH \right )_{4}]^{-}$$
  • $$[Al\left ( OH \right )_{4}\left ( H_{2}O \right )]^{-}$$
  • $$[Al\left ( OH \right )_{4}\left ( H_{2}O \right )_{2}]^{-}$$
  • $$[Al\left ( OH \right )_{6}]^{-}$$
The valencies of nitrogen and boron in borazole are :
  • $$3,3$$
  • $$4,4$$
  • $$3,4$$
  • $$4,3$$
Oxidation of aluminium is :
  • reversible
  • exothermic
  • endothermic
  • slow reaction
The inactiveness of aluminium in the presence of conc. $$HNO_{3}$$ is due to the formation of a layer of :
  • $$AlN$$
  • $$Al_{2}S_{3}$$
  • $$Al_{4}C_{3}$$
  • $$Al_{2}O_{3}$$
The compound used in etching of glass is:
  • $$\mathrm{H}\mathrm{F}$$
  • $$\mathrm{H}\mathrm{Cl}\mathrm{O}_{4}$$
  • $$\mathrm{H}\mathrm{N}\mathrm{O}_{3}$$
  • $$\mathrm{H}_{2}\mathrm{S}\mathrm{O}_{4}$$
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