CBSE Questions for Class 11 Engineering Chemistry Some P-Block Elements Quiz 10 - MCQExams.com

Which of the following acid has the same molecular weight and equivalent weight ?
  • $$H_2SO_4$$
  • $$H_3PO_2$$
  • $$H_3PO_3$$
  • $$H_3PO_4$$
Covalency of sulphur in $$SO_{4}^{2-}$$ ion is:
  • 4
  • 6
  • 2
  • 5
Colour of the solution when $$KI$$ reacts with $$Br_2$$ is:
  • pale yellow
  • reddish-brown
  • black
  • none of the above
When $${ SO }_{ 2 }$$ is passed through acidified $${ K }_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 }$$ solution:
  • the solution truns blue.
  • $${ SO }_{ 2 }$$ is reduced.
  • green $${ Cr }_{ 2 }({ SO }_{ 4 }{ ) }_{ 3 }$$ is formed.
  • the solution is decolourised.
$$HCl$$ cn be oxidised by:
  • $$KMnO_4$$
  • $$Cl_2$$
  • Conc. $$H_2SO_4$$
  • $$KMnO_4$$ and Conc. $$H_2SO_4$$
Select the correct statements:
  • First IP of Mg is less than that of Al
  • $$O^+$$ has lower electronegativity than that of $$O^-$$
  • Electron affinity of Cl is lesser than that of F
  • Second IP of oxygen is greater than that of N
Blue vitriol has:
  • Ionic bond
  • Coordinate bond
  • Hydrogen bond
  • All the above
The process requiring absorption of energy is :
  • $$N\rightarrow { N }^{ - }$$
  • $$F\rightarrow { F }^{ - }$$
  • $$Cl\rightarrow { Cl }^{ - }$$
  • $$H\rightarrow { H }^{ - }$$
The correct order of melting point of 14th group element is:
  • $$C > Si > Ge > Pb > Sn$$
  • $$C < Si < Ge < Sn < Pb$$
  • $$Sn > Pb > Ge > Si >C$$
  • $$Si > C > Ge > Sn > Pb$$
Maximum covalency shown by sulphur is:
  • $$2$$
  • $$4$$
  • $$6$$
  • none
What the covalency of phosphorous atom in excited state ?
  • 3
  • 4
  • 5
  • 1
In the following which has highest boiling point:
  • $$H I$$
  • $$H F$$
  • $$H Br$$
  • $$HCl$$
The most abundant IV A group element in the earth's  crust is :
  • Germanium
  • Carbon
  • Silicon
  • Tin
Oxidation state of carbon in HCN and HNC is respectively:-
  • $$2, 4$$
  • $$4,2$$
  • $$2, 2$$
  • $$4, 4$$
Average atomic weight of boron is $$10.10$$ and boron exists in two isotopic forms $$B^{10}$$ and $$B^{11}$$. The percentage abundance of $$B^{10}$$ is?
  • $$10\%$$
  • $$90\%$$
  • $$50\%$$
  • $$20\%$$
$$BF_{3}$$ on hydrolysis forms
  • $$H_{3}BO_{3}$$
  • $$HBF_{4}$$
  • Both $$(A)$$ and $$(B)$$
  • None of these
Boron exists in +3 state where as thallium exist in both +1 & +3 oxidation state, due to:
  • inter pair effect
  • lanthanoid contraction
  • Diagonal relationship
  • none of these
What is the colour of a solution of $$\mathrm { Al } _ { 2 } \left( \mathrm { SO } _ { 4 } \right) _ { 3 }$$ in water?
  • blue
  • pink
  • green
  • colourless
Which of the following order regarding the melting point is correct? 
  • $$Si>Ge>Pb>Sn$$
  • $$Si>Pb>Ge>Sn$$
  • $$Ge>Si>Pb>Sn$$
  • none of these
Boron when heated with carbon powder at high-temperature forms 
  • $$BC_2$$
  • $$B_4C_3$$
  • $$B_2C_3$$
  • $$B_4C$$

Eka-boron was
subsequently named as
  • Gallium
  • Germanium
  • Scandium
  • Molybdenum
Aluminium becomes passive when treated with______
  • $$Conc.H_{2}SO_{4}$$
  • $$Conc.HNO_{3}$$
  • $$Conc.HCl$$
  • $$dil.HCl$$
Which of the following compound is amphoteric?
  • $$Al_2O_3$$
  • $$CrO_3$$
  • $$SO_2$$
  • $$CO_2$$
Maximum covalency shown by boron is:
  • $$6$$
  • $$8$$
  • $$2$$
  • $$4$$
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 atoms and each oxygen atom is bonded to two silicon atoms.
  • Silicon atom is bonded two oxygen atoms
  • There are double bonds to two oxygen atoms
Which of the following is amorphous form of silica?
  • Quartz
  • Kieselguhr
  • Tridymite
  • Cristobalite
The oxidation state of P in $$ H_3PO_5 $$is :
  • +3
  • +5
  • +7
  • None of these
$$ Si_6O^{12-}_{18} $$ unit is an example of 
  • 3D Silicate
  • Double chain silicate
  • Cyclic silicate
  • 2D silicate
More than four bonds are made by how many elements in carbon family?
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
  • $$5$$
Dry ice is
  • Solid $$CO$$
  • Solid $$SO_{2}$$
  • Solid $$CO_{2}$$
  • Solid $$O_{2}$$
Carbon shows tetravalency due to:
  • $$s^2 p^2$$ hybridization
  • $$d^3 p$$ hybridization
  • $$dsp^2 $$ hybridization
  • $$sp^3 $$ hybridization
The basic nature of the hydroxides of group $$13 (III A)$$ decreases progressively down the group.
  • True
  • False
In the modern periodic table, elements are arranged in order of increasing atomic number which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz s, p, d, and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Aufbau principle filling of a new energy shell. In accordance with the Aufbau principle, the seven-period (1 to 7) have 2,8,8,18,18,32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f - block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.
The last elements of the $$p$$-block in 6th period is represented by the outer most electronic configuration.
  • $$7s^27p^6$$
  • $$5f^{14}6d^{10}7s^27p^0$$
  • $$4f^{14}5d^{10}6s^26p^6$$
  • $$4f^{14}5d^{10}6s^26p^4$$
The element with atomic number 35 belongs to : 
  • d-block
  • f-block
  • p-block
  • s-block
In view of the signs of $$\Delta_r G^{\circ}$$ for the following reaction
$$PbO_2 + Pb \rightarrow 2 PbO$$, $$\Delta_r G^{\circ}$$ < 0
$$SnO_2 + Sn \rightarrow 2 SnO$$, $$\Delta_r G^{\circ}$$ > 0 which oxidation states are more characteristic for lead and tin?
  • For lead +4, for tin +2
  • For lead +2, for tin +2
  • For lead +4, for tin +4
  • For lead +2, for tin +4
What is the general electronic configuration of group $$14$$ or $$IVA$$ elements:
  • $$ns^2\ np^4$$
  • $$ns^2\ np^2$$
  • $$ns^2\ np^6$$
  • $$ns^2$$
 Which of the following statements is correct?
  • Elements of group 15 form electron deficient hydrides
  • All elements of group 14 form electron precise hydrides
  • Electron precise hydrides have tetrahedral geometries
  • Electron-rich hydrides can act as Lewis acids
Colemanite is a mineral of:
  • $$Ca$$
  • $$B$$
  • $$Al$$
  • $$Mg$$
$$ B^{3+} $$ cannot exist in aqueous solution because of its
  • Strong reducing ability
  • Strong oxidizing ability
  • Small size and large charge
  • Large size and small charge
Carbon atoms in diamond are bonded with each other in a configuration:
  • linear
  • planar
  • octahedral
  • tetrahedral
Which one is borax?
  • $$Na_2B_4O_7 \cdot 10H_2O$$
  • $$Na_2B_4O_7 \cdot 4H_2O$$
  • $$Ca_2B_6O{11} \cdot 5H_2O$$
  • $$CaB_4O_7$$
Alumina is _______
  • a bad conductor of electricity
  • a good conductor of electricity
  • a dehydrating agent
  • soluble in water
Which of the following is a semiconductor?
  • $$C$$
  • $$Pb$$
  • $$Ge$$
  • $$Sn$$
Which of the following oxides has three dimensional structure?
  • $$CO$$
  • $$CO_2$$
  • $$SiO_2$$
  • $$SO_2$$
Which of the following is a covalent carbide?
  • $$CaCO_3$$
  • $$Al_4C_3$$
  • $$WC$$
  • $$SiC$$
Which silicon compounds is used as lubricant?
  • Asbestos
  • Silicone
  • Zeolite
  • Mica
In silicon oxide:
  • 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 atoms and each oxygen atom is bonded to two silicon atoms
  • silicon atoms is bonded to two oxygen atoms
  • there are double bonds between silicon and oxygen atoms
Possible oxidation states of boron family elements are
  • $$+1$$
  • $$+2$$
  • $$+3$$
  • $$+4$$
Which of the following statements is incorrect?
  • Boron shows only $$+3$$ oxidation state.
  • In $$Ga+3$$ oxidation state is more stable than $$+1$$ oxidation state.
  • In $$Sn+2$$ oxidation state is more stable than $$+4$$ oxidation state.
  • In $$Tl+1$$ oxidation state is more stable than $$+3$$ oxidation state.
Inert pair effect is not exhibited by:
  • $$Pb$$
  • $$Bi$$
  • $$Tl$$
  • $$B$$
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