CBSE Questions for Class 11 Engineering Chemistry Some P-Block Elements Quiz 1 - MCQExams.com

What is the general electronic configuration of $$p-block$$ elements?
  • $$\left( n \right) { s }^{ 2 }\left( n-1 \right) { p }^{ 1-6 }$$
  • $${ ns }^{ 2 }{ np }^{ 1-6 }$$
  • Both $$a$$ and $$b$$
  • None of these
What is the n factor or valancy factor of ozone during the change $$2$$O$$_3$$ $$\rightarrow$$ $$3$$O$$_2$$?
  • $$2$$
  • $$4$$
  • $$6$$
  • $$8$$
Which is correct order of stability:
  • $${Tl}^{+}<{Tl}^{+3}$$
  • $${Tl}^{+}>{Tl}^{+3}$$
  • $${Ga}^{+}>{In}^{+}>{Tl}^{+}$$
  • $${Ga}^{+3}<{In}^{+3}<{Tl}^{+3}$$
Kernite is a mineral containing:
  • aluminium
  • gallium
  • boron
  • silicon
______ can be found in bauxite and sphalerite in traces.
  • Boron
  • Aluminium
  • Gallium
  • Indium
Lorandite is a mineral of:
  • boron
  • aluminium
  • gallium
  • thallium
Beryl, cryolite are minerals of:
  • boron
  • aluminium
  • thallium
  • indium
Aluminium is usually found in $$+3$$ oxidation state. In contrast, thallium exists in $$+1$$ and $$+3$$ oxidation states. This is due to : 
  • lanthanoid contraction
  • lattice effect
  • diagonal relationship
  • inert pair effect
The element that shows greater ability to form $$p\pi -p\pi$$ multiple bonds, is:
  • $$Si$$
  • $$Ge$$
  • $$Sn$$
  • $$C$$
Correct statements among a to d regarding silicones are:

(a) They are polymers with hydrophobic character.

(b) They are biocompatible.

(c) In general, they have high thermal stability and low dielectric strength.

(d) Usually, they are resistant to oxidation and used as greases.
  • (a), (b) and (c) only.
  • (a), and (b) only.
  • (a), (b), (c) and (d).
  • (a), (b) and (d) only.
Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is:
  • $$\mathrm{R}_{2}\mathrm{S}\mathrm{i}\mathrm{C}1_{2}$$
  • $$\mathrm{R}_{3}\mathrm{S}\mathrm{i}\mathrm{C}1$$
  • $$\mathrm{R}_{4}\mathrm{S}\mathrm{i}$$
  • $$\mathrm{R}\mathrm{S}\mathrm{i}\mathrm{C}1_{3}$$
The amorphous form of silica is:
  • Quartz
  • Kieselguhr
  • Cristobalite
  • Tridymite
The correct statements among I to III regarding group $$13$$ elements oxides are:
(I) Boron trioxide is acidic
(II) Oxides of aluminium and gallium are amphoteric.
(III) Oxides of indium and thallium are basic.
  • (I), (II) and (III)
  • (II) and (III) only
  • (I) and (III) only
  • (I) and (II) only
  • 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
The crystalline form of borax has :
  • Tetranuclear $$\displaystyle { \left[ { B }_{ 4 }{ O }_{ 5 }{ \left( OH \right) }_{ 4 } \right] }^{ 2- }$$ unit
  • All boron atoms in the same plane
  • Equal number of $$\displaystyle { sp }^{ 2 }$$ and $$\displaystyle { sp }^{ 3 }$$ hybridized boron atoms
  • One terminal hydroxide per boron atom
What is the change in oxidation number of carbon in the following reaction?
$$CH_4 (g) + 4Cl_2 (g)\longrightarrow CCl_4 (l) + 4HCl(g)$$
  • $$0$$ to $$+ 4$$
  • $$-4$$ to $$+ 4$$
  • $$0$$ to $$-4$$
  • $$+4$$ to $$+ 4$$
Which of the following is incorrect statement ?
  • $$PbF_4$$ is covalent in nature
  • $$SiCl_4$$ is easily hydrolysed
  • $$GeX_4 (X=F,Cl,Br,I)$$ is more stable than $$GeX_2$$
  • $$SnF_4$$ is ionic in nature
Which one of the following elements is unable to form $$MF_{6}^{3-}$$ ion?
  • $$B$$
  • $$Ga$$
  • $$In$$
  • $$Al$$
The stability of $$+1$$ oxidation state among $$Al$$, $$Ga$$, $$In$$ and $$Tl$$ increases in the sequence:
  • $$Tl < In < Ga < Al$$
  • $$In < Tl < Ga < Al$$
  • $$Ga < In < Al < Tl$$
  • $$Al < Ga < In < Tl$$
The species, having bond angles of $$120^{\circ}$$ is:
  • $$BCl_3$$
  • $$PH_{3}$$
  • $$ClF_{3}$$
  • $$NCl_{3}$$
Glass is soluble in :
  • HF
  • $$\mathrm{H}_{2}\mathrm{S}\mathrm{O}_{4}$$
  • $$\mathrm{H}\mathrm{Cl}\mathrm{O}_{4}$$
  • Aqua regia
Solid silicones are stable up to:
  • $$100^{\circ}$$
  • $$250^{\circ}$$
  • $$300^{\circ}$$
  • $$400^{\circ}$$
Which of the following elements has a limited co-ordination number of four?
  • $$Sn$$
  • $$C$$
  • $$Si$$
  • $$Ge$$
The correct order of atomic radii in group $$13$$ elements is _________.
  • $$B < Ga < Al < Tl < In$$
  • $$B < Al < In < Ga < Tl$$
  • $$B < Ga < Al < In < Tl$$
  • $$B < Al < Ga < In < Tl$$
Which of these is not a monomer for a high molecular mass silicone polymer?
  • $$MeSiCl_{3}$$
  • $$Me_{2}SiCl_{2}$$
  • $$Me_{3}SiCl$$
  • $$PhSiCl_{3}$$
The element which, forms oxides in all oxidation states varying from +1 to +5 is:
  • $$N$$
  • $$P$$
  • $$As$$
  • $$Sb$$
Among the following substituted silanes, the one which will give rise to cross-linked silicon polymer on hydrolysis is: 
  • $$R_3SiCl$$
  • $$R_4Si$$
  • $$RSiCl_3$$
  • $$R_2SiCl_2$$
Which of the element shows $$+4$$ oxidation state?
  • $$Sn$$
  • $$Ra$$
  • $$Fr$$
  • $$Sc$$
Which one of the following pentafluorides cannot be formed?
  • $$PF_5$$
  • $$AsF_5$$
  • $$SbF_5$$
  • $$BiF_5$$
What type of oxide would Eka-Aluminium(Gallium) form?
  • $$GaO_3$$
  • $$Ga_3O_2$$
  • $$Ga_2O_3$$
  • $$GaO$$
Silica is heated with carbon in electric furnace to form :
  • silicon carbonate
  • silicon carbide or carborundum
  • silicon monoxide
  • none
Quartz is the form ?
  • $$CO_{2}$$
  • $$SiO_{2}$$
  • $$SO_{2}$$
  • $$NO_{2}$$
The structure of $$SiO_{2}$$ ?
  • trigonal
  • linear
  • tetrahedral
  • angular
Which of the following is used for making optical
instruments :
  • $$SiO_{2}$$
  • Si
  • $$SiH_{4}$$
  • SiC
Density is highest for :
  • Si
  • Ge
  • Sn
  • Pb
Silicones are:
  • toxic
  • non-toxic
  • bitter
  • sour
Silica dissolves in NaOH solution to form:
  • quartz
  • sodium silicate
  • carborundum
  • jaspar
In silicones, silicon is strongly linked to:
  • oxygen
  • nitrogen
  • sulphur
  • carbon.
Which is the crystalline form of silica?  
  • Agate
  • Jaspar
  • Onyx
  • Crystobalite
Rock crystal is:
  • NaCl
  • Sand
  • Quartz
  • Agate
Glass reacts with HF forming :
  • $$\mathrm{F}_{2}$$
  • $$\mathrm{H}_{2}\mathrm{S}\mathrm{i}\mathrm{F}_{6}$$
  • $$ \mathrm{C}\mathrm{a}\mathrm{F}_{2}$$
  • $$\mathrm{N}\mathrm{a}\mathrm{F}$$
Self protective metal among the following is:
  • Na
  • Al
  • Fe
  • K
Borax is:
  • miscible in water.
  • immiscible in oil.
  • partially soluble in cold water & fairly soluble in hot water.
  • insoluble in water.
Which metal powder suspended in oil is used as a paint for mirrors?
  • Fe
  • Sn
  • Ag
  • Al
The maxium covalency of aluminium is:
  • 4
  • 6
  • 8
  • 3
$$Na_{2}B_{4}O_{7.}\, 10\, H_{2}O$$ is:
  • Borax
  • Kernite
  • Glauber salt
  • Colemanite
Boric acid is prepared from borax by the action of
  • $$HCl$$
  • $$NaOH$$
  • $$CO_{2}$$
  • $$Na_{2}CO_{3}$$
Which of the following molecules is nonpolar?
(i)$$PbCl_4$$
(ii)$$BF_3$$
(iii)$$SnCl_2$$
(iv)$$CS_2$$
  • (i), (ii), (iii)
  • (i), (ii), (iii), (iv)
  • (i), (ii), (iv)
  • (ii), (iii), (iv)
The reagent that has action on glass is: 
  • aqua regia
  • hydrofluoric acid
  • oleum
  • fuming nitric acid
The compound used for etching of glass is:
  • HI
  • HBr
  • HCl
  • HF
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