CBSE Questions for Class 11 Engineering Chemistry Some P-Block Elements Quiz 4 - MCQExams.com

Which of the following represent prismatic borax?
  • $$Na_{2}B_{4}O_{7}.10H_{2}O$$
  • $$Na_{2}B_{4}O_{7}.5\, H_{2}\, O$$
  • $$Na_{2}B_{4}O_{7}.3H_{2}O$$
  • $$Na_{2}B_{4}O_{7}.4H_{2\, }O$$
$$CaCO_3+SiO_2\rightarrow$$ __________.
  • $$CaO+SiCO_3$$
  • $$CaSiO_3+SiO_2$$
  • $$CaSiO_3+CaO$$
  • $$CaSiO_3+CO_2$$
$$Ca_{2}B_{6}O_{11}+2Na_{2}CO_{3}\rightarrow X + 2CaCO_{3} + 2Na_{2}BO_{2}$$. The compound X in the above reaction is :
  • $$Na_{2}B_{4}O_{7}$$
  • $$HBO_{2}$$
  • $$H_{3}BO_{3}$$
  • $$H_{2}B_{4}O_{7}$$
In aluminate ion, the coordination number of aluminium is:
  • 2
  • 4
  • 6
  • 1
Which of the following reacts with nitrogen when heated in air:
  • Al
  • C
  • Na
  • K
The reducing character of Al, Ga, In, Tl increases in which of the following order?
  • $$Al< Tl< Ga> In$$
  • $$Ga< Al< Tl< In$$
  • $$Tl< In< Ga< Al$$
  • $$Al< Ga< In< Tl$$
$$Al$$ reduces most of the metallic oxides due to its greater affinity for:
  • oxygen
  • metals
  • electrons
  • protons
When HF reacts with glass, the compound formed is:
  • $${F}_{2}$$
  • $$NaF$$
  • $$Na_{3}AlF_{3}$$
  • $$Na_{2}SiF_{6}$$
Which is true for an element R present in III A group of the periodic table?
  • It forms halide of type $$RX_{3}$$
  • It has oxidation state of +3
  • It forms oxide of type $$R_{2}O_{3}$$
  • .All the above
Consider the reaction, $$LiH+AlH_{3}\rightarrow .....$$ 
Which is the incorrect statement about this reaction?
  • The product is a good reducing agent
  • $$AlH_{3}$$ acts as a lewis acid
  • There is decrease in the oxidation number of aluminium in the product
  • $$LiH$$ donates $$H^{-}$$ to $$AlH_{3}$$
Which amongst the following is also called as a sesqui oxide?
  • $$B_{2}O_{3}$$
  • $$Al_{2}O_{3}$$
  • $$Tl_{2}O_{3}$$
  • All of the above
Which of the following forms $$M_{2}O$$ type of oxide?
  • Al
  • B
  • Tl
  • Ca
Which of the following species cannot exist?
  • $$[BF_{6}]^{3-}$$
  • $$[AlF_{6}]^{3-}$$
  • $$[GaF_{6}]^{3-}$$
  • $$[InF_{6}]^{3-}$$
Which of the following oxides dissolves in both hydrochloric acid and sodium hydroxide solution? (1993)
  • Na
  • MgO
  • BaO
  • $$Al_{2}O_{3}$$
Which metal burns in air at high temperature with
the evolution of much heat?
  • Cu
  • Al
  • Hg
  • Pb
Catenation i.e., linking of similar atoms depends on the size and electronic configuration of atoms. The tendency of catenation in Group 14 elements follows the order:
  • C < Si < Ge < Sn
  • C > Si > Ge > Sn
  • Si > C > Sn > Ge
  • Ge > Sn > Si > C
Which of the following oxidation states are the most characteristic for lead and tin respectively:
  • $$+2,+2$$
  • $$+4, +2$$
  • $$+2, +4$$
  • $$+4, + 4$$
The repeating structural units in silicone is:
  • $$(R_2SiO-)$$
  • $$SiO_{2}$$
  • $$R-O-Si-\underset {\overset {|}R}O-$$
  • $$(-R_2Si-O-O-R)$$
The tendency of BF$$_{3}$$, BCl$$_{3}$$ and BBr$$_{3}$$ to behave as Lewis acid decreases in the sequence is:
  • BCl$$_{3}$$ > BF$$_{3}$$ > BBr$$_{3}$$
  • BBr$$_{3}$$ > BCl$$_{3}$$ > BF$$_{3}$$
  • BBr$$_{3}$$ > BF$$_{3}$$ > BCl$$_{3}$$
  • BF$$_{3}$$ > BCl$$_{3}$$ > BBr$$_{3}$$
The abundance of B, Al, Ga and Tl in earth crust follows the order:
  • $$B< Al< Ga< Tl$$
  • $$Tl< B< Al< Ga$$
  • $$Tl< Al< B< Ga$$
  • $$Tl< Ga< B< Al$$
What is the value of X in the given chemical formula of crystalline borax, $$Na_{2}[B_{4}O_{5}(OH)_{4}].XH_{2}O$$?
  • 5
  • 6
  • 7
  • 8
Which of the following is the electron deficient molecule?
  • $$C_{2}H_{6}$$
  • $$B_{2}H_{6}$$
  • $$SiH_{4}$$
  • $$PH_{3}$$
Quartz is a crystalline variety of:
  • Silicon carbide
  • Sodium silicate
  • Silica
  • Silicon
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
  • $$[B_{3}O_{3}(OH)_{4}]^{-}$$ is formed only
The structure of silicon(IV) oxide belongs to the type:
  • ionic lattice
  • macromolecular, with a layer structure
  • molecular lattice, with van der Waals forces among the molecules
  • macromolecular, with a non-layer structure
$$TlI_{3} $$ is:
  • an ionic compound consisting of $$Tl^{3+}$$ and three $$3I^{-}$$ ions
  • a covalent compound
  • an ionic compound consisting of $$Tl^{+}$$ and $$I_{3}^{-}$$ ions
  • a mixture of $$TlI$$ and $$I_{2}$$
Which of the following curves assures that the metal obtained by carbon reduction is in the vapour state?
Aluminium hydroxide is amphoteric.
  • True
  • False
The gaseous product(s) expected at room temperature by reaction of sodium borohydride an boron trifluoride under anhydrous conditions is/are :
  • $$H_2$$
  • $$B_2H_6$$ and $$H_2$$
  • $$B_2H_6$$
  • $$BH_2F$$ and $$H_2$$
Name the type of the structure of silicate in which one oxygen atom of $$\left [ SiO_{4} \right ]^{4-}$$ is shared:
  • linear chain silicate
  • sheet silicate
  • pyrosilicate
  • three dimensional silicate
Usually a disilicate share only one oxygen of silicate unit. But if in the disilicate, two $$O$$ atoms are shared, then formula of its salt with potassium is :
  • $$K_6Si_2O_7$$
  • $$K_{4}Si_2O_6$$
  • $$K_2Si_2O_6$$
  • $$K_8Si_2O_8$$
Formula of Pyro silicic acid:
  • $$ H_2Si_4O_9 $$
  • $$H_4Si_2O_6$$
  • $$H_4Si_3O_8$$
  • $$H_6Si_2O_7$$
Read the following short write-up and answer the questions at the end of it The name 'silica' covers an entire group of minerals, which have the general formula $$SiO_{2}$$, the most common of which is quartz. Quartz is a framework silicate with $$SiO_{4}$$tetrahedra arranged in spirals. The spirals can turn in a clockwise or anticlockwise direction- a feature that results in there being two mirror images, optically active, varieties of quartz.
The following pictures represent various silicate anions. Their formulae for silicon and oxygen respectively:

130423.jpg
  • $$SiO_{3}^{2-}\:Si_{3}O_{7}^{2-}$$
  • $$SiO_{4}^{4-}\:Si_{3}O_{10}^{8-}$$
  • $$SiO_{4}^{2-}\:Si_{3}O_{9}^{2-}$$
  • $$SiO_{3}^{4-}\:Si_{3}O_{7}^{8-}$$
Borax is actually made of two tetrahedral and two triangular units joined together and should be written as: 

      $$Na_{2}[B_{4}O_{5}(OH)_{4}].8H_{2}O$$

Consider the following statements about borax.
  • Each boron atom has four $$B-O$$ bonds
  • Each boron atom has three $$B-O$$ bonds
  • Two boron atoms have four $$B-O$$ bonds while other two have three $$B-O$$ bonds
  • Each boron atom has one $$-OH$$ groups
The possible oxidation state of Tl are:
  • +1 and +2
  • +2 and +3
  • +1 and -1
  • +1 and +3
In silicon dioxide :
  • each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms
  • each silicon atom is surrounded by two oxygen atom and each oxygen atom is bonded to two silicon atoms
  • silicon atom is bonded to two oxygen atoms
  • there are double bonds between silicon and oxygen atoms
The repeating structural unit in silicone is:
  • $$R_2SiO$$
  • $$SiO_2$$
  • $$SiO_3$$
  • All of the above
If we start with $$MeSiCl_{3}$$ as the starting material, silicones formed is :
  • both of the above
  • none of the above
Which of the following are true about Silicones?
  • They are formed by the hydrolysis of $${ R }_{ 2 }{ SiCl }_{ 2 }$$
  • They are polymer made by $${ R }_{ 2 }{ SiO }_{ 2 }$$ units
  • They are made up of $${ R }_{ 2 }{ SiO }_{ 2 }$$ units
  • They are macromolecules
An inorganic compound (A) made of two most occurring elements into the earth crust, having a polymeric tetrahedral network structure. With carbon, compound (A) produces a poisonous gas (B) which is the most stable diatomic molecule. Compounds (A) and (B) will be :
  • $$SiO_{2},CO_{2}$$
  • $$SiO_{2},CO$$
  • $$SiC,CO$$
  • $$SiO_{2},N_{2}$$
$$CO_2$$ is gas, while $$SiO_2$$ is solid because :
  • $$CO_2$$ is a linear molecule, while $$SiO_2$$ is angular.
  • van der Waals' forces are very strong in $$SiO_2$$.
  • $$CO_2$$ is covalent, while $$SiO_2$$ is ionic.
  • $$Si$$ cannot form stable bonds with $$O$$, hence $$Si$$ has to form a $$3D$$ lattice.
Borax is actually made of two tetrahedral and two triangular units joined together and should be written as: $$\displaystyle  Na_{2}[B_{4}O_{5}(OH)_{4}]\cdot 8H_{2}$$O 
Consider the following statements about borax. Which of the following is the correct statement?
  • Each boron atom has four $$B-O$$ bonds
  • Each boron atom has three $$B-O$$ bonds while other two have three $$B-O$$ bonds
  • Each boron atom has four $$B-O$$ bonds while other two have three $$B-O$$ bonds
  • Each boron atom has one $$-OH$$ groups
$${SiO_2}$$ reacts with :
  • $${Na_2 CO_3}$$
  • $${CO_2}$$
  • $$HF$$
  • $$HCl$$
Select the correct statement about silicates:
  • Cyclic silicate having three Si atoms contains six Si---O---Si linkages
  • $${\displaystyle2\frac{1}{2}}$$ ver oxygen atoms of phedron unit are shared in double chain silicate
  • ($${Si_2O_5})^{2n-}_{n}$$ is formula of double chain silicate
  • $${SiO^{4-}_{4}}$$ units polymerize to form silicate because Si atom has less tendency to form $${\pi}$$- bond with oxygen
$$RCl \displaystyle \xrightarrow[Si]{cu-powder} R_{2}SiCl_{2} \xrightarrow{H_{2}O} R_{2}Si\left ( OH \right )_{2} \xrightarrow{condensation} A$$
Compound ( A ) is :
  • a linear silicone
  • a chlorosilane
  • a linear silane
  • a network silane
Silicate having one monovalent corner oxygen atom in each tetrahedron unit is:
  • sheet silicate
  • cyclic silicate
  • single chain silicate
  • double chain silicate
Select correct statement:
  • Oxides of carbon family $$(MO_2)$$ are all network solids with octahedral coordination.
  • silicon dioxide(silica) is a network solid with tetrahedral coordination and is a giant molecule.
  • $$GeO_2, SnO_2$$ and $$PbO_2$$ are all acidic oxides.
  • None of the above.
Which of the following cuts ultraviolet rays?
  • Soda glass.
  • Crookes glass.
  • Pyrex.
  • None of these.
Stability of hydrides of carbon family is in order :
  • $$CH_4 > SiH_4 > GeH_4 > SnH_4 > PbH_4$$
  • $$CH_4 < SiH_4 < GeH_4 < SnH_4 < PbH_4$$
  • $$CH_4 > SnH_4 > GeH_4 > SiH_4 > PbH_4$$
  • None of  these
Silica will react in a similar way with metal sulphates (and Phosphates) as it does with carbonates, giving a solid residue and a gas. $$1$$ mole of silica reacts with $$1$$ mole of sodium sulphate, $$Na_2SO_4$$. Write the equation:
  • $$SiO_2(s)+Na_2SO_4(s)\rightarrow Na_2SiO_3(s)+SO_3(g)$$
  • $$SiO_2(s)+Na_2SO_4(s)\rightarrow Na_2SiO_4(s)+SO_2(g)$$
  • $$SiO_2(s)+Na_2SO_4(s)\rightarrow Na_2SiO_2(s)+SO_4(g)$$
  • None of these
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 11 Engineering Chemistry Quiz Questions and Answers