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CBSE Questions for Class 11 Engineering Chemistry Some P-Block Elements Quiz 8 - MCQExams.com

In 3rd A group Tl shows +1 oxidation state while other member shows +3 oxidation state due to :
  • presence of lone pair of electron in Tl
  • Inert pair effect
  • Large Ionic radius of Tl ion
  • None of above 
What is hybridisation of boron in [B(OH)4]?
  • sp2
  • sp3
  • sp3d2
  • None of these
Metals react with silicons to form:
  • silicates
  • silanes
  • silicides
  • mixture of silicates and silanes
The no. of unpaired electrons in carbon is :
  • 1
  • 2
  • 3
  • 4
Which of the following statement is correct with respect to the property of elements in carbon family?With an increase in their atomic number their:
  • atomic size decreases
  • ionization energy increases
  • metallic character decreases
  • stability of +2 oxidation state increases
The hydrides formed by germanium are:
  • GeH2
  • GeH4
  • GeH6
  • GeH3
The metalloid in the carbon family is:
  • carbon
  • tin
  • silicon
  • lead
Which of the following oxide is formed by carbon?
  • Sesquioxide
  • Suboxide
  • Superoxide
  • All
Which of the following characteristic property increases as we go down the carbon group?
  • Acidic nature of oxides
  • Electronegativity
  • Metallic characters
  • Non-metallic characters
The naturally occuring  radioactive isotope of carbon is:
  • C12
  • C13
  • C14
  • none of the above
The number of oxides formed by carbon is:
  • 2
  • 3
  • 4
  • 5
The only hydride formed by lead has the formula:
  • PbH2
  • PbH4
  • PbH6
  • PbH3
Physical properties of a substance are given.
P It is colour less
Q has intense smell
R It's aqueous solution possesses basic property.
Which of the above physical properties are correct for sulphur dioxide?
  • Only P and Q
  • P,Q and R
  • Only Q and R
  • Only R
The relative strength of trichlorides of boron group to accept a pair of electron is given by:
  • GaCl3>AlCl3>BCl3
  • AlCl3<BCI3<GaCl3
  • AlCl3<GaCl3<BCl3
  • BCl3<AlCl3<GaCl3
  • GaCl3<BCl3<AlCl3
The correct Lewis acid order for boron halides is:
  • BBr3>BCl3>BI3>BF3
  • BI3>BF3>BBr3>BCl3
  • BF3>BCl3>BBr3>BI3
  • BI3>BBr3>BCl3>BF3
An ionic compound is:
  • SnCl2
  • CCl4
  • GeCl4
  • SiCl4
In boron atom screening on outermost electron is due to:
  • electrons of K shell only
  • all the electrons of K and L shell
  • two electrons of 1s and 2s each
  • only by electrons of L shell
The hybridised state of Al3+ in the complex ion formed when AlCl3 is treated with aqueous acid is:
  • sp3
  • dsp2
  • sp3d2
  • sp2d
  • sp2
Addition of mineral acid to an aqueous solution of Borax, the compound formed is:
  • Puroboric acid
  • Boron hydride
  • Meta boric acid
  • Orthoboric acid
Boron nitride has the structure of the type:
  • Graphite type
  • Diamond type
  • Both diamond and graphite type
  • NaCl type
What is the chief constituent of Pyrex glass ?
  • B2O3
  • SiO2
  • Al2O3
  • NaO2
The element Z=114 has been discovered recently. It will belong to which of the following family/ group and electronic configuration?
  • Nitrogen family, [Rn]5f146d107s27p6
  • Halogen family, [Rn]5f146d107s27p5
  • Carbon family, [Rn]5f146d107s27p2
  • Oxygen family, [Rn]5f146d107s27p4
Colemanite is
  • Na2B4O710H2O
  • Ca2B6O115H2O
  • NaBO2
  • H3BO3
Boron has an extremely high melting point because of:
  • the strong van der Waals forces between its atoms
  • the strong binding forces in the covalent polymer
  • its ionic crystal structure
  • allotropy
Which of the following is not silicate?
  • Zeolite
  • Feldspar
  • Ultramarine
  • Silica
Elements of 14 group :
  • Exhibit oxidation state of + 4 only
  • Exhibit oxidation states of +2 and + 4
  • form M2 and M4+ ions
  • form M2+ and M4+ ions
Addition of HCl to an aqueous solution of Pb(NO3)2 gives a
  • Yellow Precipitate
  • Baum Precipitate
  • White Precipitate
  • Black Precipitate
Which of the following is the most basic oxide?
  • Sb2O3
  • Bi2O3
  • SeO2
  • Al2O3
 When borax is dissolved in water:
  • B(OH)3 is formed only
  • [B(OH)4] formed only
  • both B(OH)3 and [B(OH)4] are formed
  • [B3O3(OH)4] is formed only
Which of the following molecule is /are chiral ?
712142_fefc5e6d4ab746488f62ca887dbde8f5.png
  • I
  • II
  • III
  • IV
The outermost electronic configuration of the most electronegative element is:
  • ns2np3
  • ns2np4
  • ns2np5
  • ns2np6
Which one of the following statements about H3BO3 is not correct?
  • It is a strong tribasic acid.
  • It is prepared by acidifying an aqueous solution of borax.
  • It has a layer structure in which planar BO, units are joined by hydrogen bonds.
  • It does not act as proton donor as it acts as a Lewis acid by accepting hydroxyl ions.
Elements of group 13 shows :
  • only +1 oxidation state
  • only +3 oxidation state
  • +1 and +3 oxidation states
  • +1, +2 and +3 oxidation states
SiF4 gets hydrolysed then which of the following is not expected to from? 
  • SiO2
  • Si(OH)2F2
  • H2SiF6
  • Si(OH)4
In group 13, electronegativity first decreases from B to Al and then increase marginally down the group. This is because of :
  • non- metallic nature of B
  • discrepancies in atomic size of element
  • ability of B and Al to form pπ - pπ multiple bonds
  • irregular trend in electronegativity throughout the periodic table
Which of the following metals does not show inert pair effect? 
  • Thallium
  • Gallium
  • Indium
  • Aluminium
The reason behind the lower atomic radius of Ga as compared to Al is ?
  • poor screening effect of d-electrons for the outer electrons from the increased nuclear charge
  • increased force of attraction of increased nuclear charge on electrons
  • increased ionisation enthalpy of Ga as compared to Al
  • Anomalous behaviour of Ga
Aluminium exhibits +3 oxidation state. As we move down the group, +1 oxidation states get more stable. This is a consequence of :
  • increasing size of the atom
  • inert pair effect
  • electron deficient nature
  • pπ-pπ bonding
Group 13 elements show +1 and +3 oxidation states. Relative stability of +3 oxidation state may be given as :
  • Tl3+>In3+>Ga3+>Al3+>B3+
  • B3+>Al3+>Ga3+>In3+>Tl3+
  • Al3+>Ga3+>Tl3+>In3+>B3+
  • Al3+>B3+>Ga3+>Tl3+>In3+
Which is the most electropositive element?
  • Na
  • Cu
  • Cs
  • Ca
Chemically borax is ?
  • sodium metaborate
  • sodium orthoborate
  • sodium tetraborate decahydrate
  • sodium hexaborate.
Aluminium oxide is not reduced by chemical reactions due to ?
  • its highly stable nature
  • its highly unstable nature
  • its amphoteric nature
  • its highly explosive nature
Boron is unable to form BF36 ions due to:
  • non-availability of d-orbitals
  • small size of boron atom
  • non-metallic nature
  • less reactivity towards halogens.
The tendency of group 14 elements to show +2 oxidation state increases in the order of:
  • C<Si<Sn<Pb<Ge
  • C<Si<Ge<Sn<Pb
  • Ge<Sn<Pb<C<Si
  • Pb<Sn<Ge<C<Si
The first member of the p-block elements differs from the remaining members of their corresponding groups due to :
  • small size and absence of d-orbitals
  • diagonal relationship with other elements
  • difference in ability to form double and triple bonds
  • high ionisation enthalpy
Formula for the following compound Thallium (I) sulphate is Tl2SO4.
  • True
  • False
Which of the following properties correctly explain the compound SiO2?
  • Linear, basic
  • Tetrahedral, acidic
  • Tetrahedral, basic
  • Linear, acidic
Electropositive character for the elements of group 13 follows the order ?  
  • B > Al > Ga > In > Tl
  • B < Al < Ga < In < Tl
  • B < AL > Ga < In > Tl
  • B < Al > Ga > In > Tl
Which of the following ions is the most stable?
  • Sn2+
  • Ge2+
  • Si2+
  • Pb2+
Silicon is an important constituent of:
  • sand
  • atmosphere
  • plants
  • water bodies
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