NEET Chemistry The P Block Elements MCQs Set B

Question:

• a) Linear
• b) Tetrahedral
• c) T shape
• d) Trigonal bipyramidal

Answer: T shape

Question: The correct order of acidic strength is

• a) HClO₄> HClO₃> HClO₂> HClO  
• b) HClO₃> HBrO₃> HIO₃
• c) H₃PO₂> H₃PO₃> H₃PO₄   
• d) All of these

Answer: All of these

Question: The one with maximum oxidising power is

• a) Hypochlorous acid
• b) Chlorous acid
• c) Chloric acid
• d) Perchloric acid

Answer: Hypochlorous acid

Question: Which is mismatched regarding the shape?

• a) XeF₄= Square planar
• b) XeOF₄= Square pyramidal 
• c) XeF₆= Distorted octahedral
• d) XeO₃= Bent T shape

Answer: XeO₃= Bent T shape

Question:  Structure of XeO₂F₂ is correctly represented by

• a)

  

• b)

  

• c)

  

• d) Both (2) & (3)

Answer:

Question: Boron compounds behave as lewis acids because of their

• a) Acidic nature
• b) Covalent nature
• c) Ionisation energy
• d) Electron deficient nature

Answer: Electron deficient nature

Question: The compound that is not a lewis acid is

• a) BF₃ 
• b) AlCl₃
• c) PCl₃
• d) SnCl₄

Answer: PCl₃

Question: In Diborane, the incorrect statement is

• a) All 6 B–H bond are on same plane
• b) 4 B–H bonds are on the plane and two B–H bonds above and below the plane
• c) It is the 12 e^– species
• d) Two BH₃ are attached with three centre electron pair bond

Answer:  All 6 B–H bond are on same plane

Question: On strong heating, boric acid yields

• a) B
• b) B₂H₆
• c) B₂O₃
• d) BO₂

Answer:  B₂O₃

Question: Which of the following statement is correct?

• a) Boron and aluminium halides behave as Lewis acids
• b) Al forms [AlF₆]^3– ion but B does not form [BF₆]^3– ion
• c) The pπ – pπ back bonding occurs in the halides of boron and not in those of aluminium
• d) All of these

Answer: All of these

Question: Aluminium chloride in acidified aqueous solution forms

• a) Tetrahedral [Al(H₂O)₄]³⁺ ion  
• b) Octahedral [Al(H₂O)₄]³⁺ ion   
• c) Tetrahedral [Al(H₂O)₆]³⁺ ion
• d) Octahedral [Al(H₂O)₆]³⁺ ion

Answer:   Octahedral [Al(H₂O)₆]³⁺ ion

Question:

The 'Z' will be

• a) X
• b) Y
• c) Mixture of X & Y in 2 : 1 ratio
• d) Mixture of X & Y in 1 : 2 ratio

Answer: Y

Question: Diborane can't be obtained from

• a) Na₂B₄O₇+ HCl 
• b) NaBH₄+ I₂
• c) BF₃+ LiAlH₄
• d) BF₃+ NaH

Answer:  Na₂B₄O₇+ HCl 

Question:  White fumes appear around the bottle of anhydrous AlCl₃ due to

• a) Decomposition of AlCl₃
• b) Hydrolysis of AlCl₃ liberating H₂ gas
• c) Hydrolysis of AlCl₃ liberating Cl₂ gas 
• d) Hydrolysis of AlCl₃ liberating HCl gas

Answer:   Hydrolysis of AlCl₃ liberating HCl gas

Question: Number of hydroxyl group attached to Boron in Borax are

• a) Four
• b) Five
• c) Six
• d) Ten

Answer: Four

Question: The correct match is

• a) C₆₀– Buckminster fullerene
• b) Na₂B₄O₇.4H₂O – Kernite
• c) Borazole – B₃N₃H₆ 
• d) All of these

Answer: All of these

More Questions...........................................

Question: The correct match is

• a) B(OH)₃– basic 
• b) SnO, PbO – amphoteric
• c) GeO₂– basic 
• d) PbO₂– only acidic

Answer:  SnO, PbO – amphoteric

Question:  C – O bond length is maximum in

• a) CH₃CHO
• b) CO₂   
• c) CO
• d)

  

Answer:

Question:  Reaction of ammonia with diborane gives initially B₂H₆.2NH₃ which can also be written as

• a) [BH₂(NH₃)₂]⁺[BH₄]^–
• b) [BH₄]⁺[BH₂(NH₃)₂]^–
• c) [BH₃NH₃]⁺[BH₄]^– 
• d) [B₂N₂H₆]⁺[H₃]^–

Answer:  [BH₂(NH₃)₂]⁺[BH₄]^–

Question: Dry ice is composed of

• a) Solid He
• b) Solid CO₂
• c) Solid SO₂
• d) Solid C₆H₆

Answer:  Solid CO₂

Question: The metallic character of group 14

• a) Decreases from top to bottom
• b) Increases from top to bottom
• c) Does not change gradually
• d) Metallic character is not seen

Answer: Increases from top to bottom

Question: In carbon family the tendency to show +2 oxidation state increases in order of

• a) Ge < Sn < Pb
• b) Pb < Sn < Ge
• c) Sn < Ge < Pb
• d) Sn < Pb < Ge

Answer: Ge < Sn < Pb

Question:  Which one of the following is correct statement of fullerenes –C₆₀ ? 

• a) Fullerenes are made by heating of graphite in an electric arc in the presence of Hydrogen
• b) Fullerenes are the only impure form of carbon due to presence of dangling bonds
• c) Both (1) & (2)
• d) It contains twenty six-membered rings and twelve five membered rings

Answer: It contains twenty six-membered rings and twelve five membered rings

Question:  When SiCl₄ is allowed to undergo hydrolysis it gives

• a) SiO₂^– Silicic acid
• b) Si(OH)₄– Silicic acid
• c) Si(OH)Cl₃– Silicic acid 
• d) SiCl₄ do not undergo hydrolysis

Answer:  Si(OH)₄– Silicic acid

Question:  The mixture of CO & H₂ is known as

• a) Water gas or producer gas
• b) Water gas or synthesis gas
• c) Synthesis gas or producer gas
• d) Producer gas

Answer: Water gas or synthesis gas

Question:  pπ–pπ multiple bond is seen in

• a) Mostly carbon
• b) All carbon family member
• c) Sn but not in carbon
• d) Boron family and not in carbon family

Answer: Mostly carbon

Question: Which statement is correct for carbon family?

• a) Tin mainly occurs as Cassiterite, SnO₂
• b) Silicon is the third most abundant element on earth's crust
• c) Only two isotopes of carbon are present C¹² and C¹³
• d) Germanium is most abundant than other members of carbon family

Answer:  Tin mainly occurs as Cassiterite, SnO₂

Question:

A, B & X respectively are

• a) CH₄, Carbon, Fe₂O₃
• b) Fe₂O₃, ZnO, CH₄ 
• c) Fe₂O₃, CH₄, ZnO  
• d) HCOOH, Carbon, CH₄

Answer:  Fe₂O₃, ZnO, CH₄ 

Question:  The geometry of SiCl₄ is

• a) Tetrahedral
• b) Square planar
• c) Octahedral
• d) Planar triangular

Answer: Tetrahedral

Question: The silicates which contain discrete tetrahedral units are

• a) Sheet silicates
• b) Ortho silicates
• c) Three dimensional silicates
• d) Pyrosilicate

Answer: Ortho silicates

Question:

• a) (CH₃)₂SiCl₂, (CH₃)₂Si(OH)₂
• b) (CH₃)₂Si(OH)₂, (CH₃)₂SiCl₂  
• c) SiCl₄, Si(OH)₄ 
• d) Si(OH)₄, SiCl₄

Answer:  (CH₃)₂Si(OH)₂, (CH₃)₂SiCl₂  

Question:   Hydrolysis of dimethyldichloro silane; (CH₃)₂ SiCl₂ followed by condensation polymerisation yields straight chain polymer of

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Silicons are

• a) Water repelling in nature
• b) With high thermal stability
• c) With high dielectric strength
• d) All of these

Answer: All of these

Question: Which one is correct statement for zeolite?

• a) They are alumino silicates
• b) Hydrated zeolites are used as ion exchangers in hardening of soft water
• c) ZSM-5 is used to convert gasoline to alcohol
• d) All of these

Answer: They are alumino silicates

Question: The correct statement is

• a) Diamond is covalent yet it has high melting point
• b) [SiF₆]^2– is known whereas [SiCl₆]^2– is not
• c) SiO only exist at high temp.
• d) All of these

Answer: All of these

Question:

(i) SiO₂+ NaOH →?

(ii) SiO₂+ HF  →?

The products of (ii) & (i) respectively are

• a) H₂SiF₆, SiO₄^4–  
• b) SiF₄, Na₂SiO₃
• c) Na₂SiO₃, SiF₄  
• d) Na₂SiO₄, H₂SiF₆

Answer:  SiF₄, Na₂SiO₃

Question: Calcium carbide on hydrolysis gives

• a) Ethylene
• b) Acetylene
• c) Methane
• d) Propyne

Answer: Acetylene

Question: Carbon suboxide has the formula

• a) H₂CO₃
• b) C₂O₃
• c) C₃O₂
• d) CO

Answer:  C₃O₂

Question:

A, B, C and D respectively are

• a) NO, NO₂, HNO₃ and HNO₂  
• b) NO₂, HNO₂, NO and HNO₃
• c) HNO₂, NO₂, HNO₃ and N₂O     
• d) HNO₂, N₂O, NO and HNO₃

Answer:  NO, NO₂, HNO₃ and HNO₂  

Question: Phosphine on reaction with hydrobromic acid gives

• a) PBr₃  
• b) P₂H₄Br₂
• c) PBr₅  
• d) PH₄Br

Answer:  PH₄Br

Question: Which of the following can hydrolysed?

• a) TeF₆  
• b) NCl₃
• c) SF₆ 
• d) All of these

Answer: All of these

Question:  In P₄O₁₀ the number co-ordinate bonds is

• a) 1
• b) 8
• c) 3
• d) 4

Answer: 4

Question:  Calomel (Hg₂Cl₂) on reaction with NH₄OH gives

• a) Hg₂O 
• b) HgO
• c) HgNH₂Cl 
• d) NH₂Hg₂Cl

Answer:  HgNH₂Cl 

Question:  XeF₆  on complete hydrolysis gives

• a) Xe
• b) XeO₂ 
• c) XeO₃ 
• d) XeO₂F₂

Answer:  XeO₃ 

Question: Which of the following is most basic?

• a) Cl^– 
• b) F^–
• c) I^–
• d) Br^–

Answer:  F^–

Question:  Nitrogen is obtained when NaNO₂ reacts with

• a) NH₄Cl 
• b) NH₄NO₃
• c) (NH₄)₂CO₃  
• d) NH₄OH

Answer:  NH₄Cl 

Question:  Which one of the following does not form during the hydrolysis of XeF₆?

• a) XeO₃  
• b) XeOF₄ 
• c) XeO₂F₂
• d) XeOF₃

Answer:  XeOF₃

Question: The final product formed, when alkaline KI solution reacts with ozone, is

• a) I₂
• b) KIO₃ 
• c) HI
• d) Reaction will not occur

Answer:  I₂

Question: Which of the following is a sesqui oxide?

• a) N₂O₄ 
• b) N₂O₃
• c) N₂O
• d) N₂O₅

Answer:  N₂O₃

Question: The product ‘P’ will be

• a) H₂PtCl₄
• b) H₂PtCl₆ 
• c) H₂PtCl₂
• d) H₃PtCl₃

Answer:  H₂PtCl₆ 

Question:  What is the product formed when NH₃ reacts with excess of Cl₂ ?

• a) NH₄Cl & HCl 
• b) NH₄Cl & N₂
• c) NCl₃& HCl 
• d) NH₄Cl & NCl₃

Answer:  NCl₃& HCl 

Question:  Hybridisation of central ‘N’-atom in N₂O is

• a) sp
• b) sp²
• c) sp³  
• d) sp & sp²

Answer: sp

Question: The most acidic oxide among the following is

• a) SO₃
• b) P₂O₅
• c) Cl₂O₇
• d) SiO₂  

Answer:  Cl₂O₇

Question:  In solid state PBr₅ exist as

• a) [PBr₄]⁺ [PBr₆]^–
• b) [PBr₅]⁺ [PBr₅]^–
• c) [PBr₄]⁺ [Br^–]   
• d) PBr₅

Answer:  [PBr₄]⁺ [Br^–]   

Question:  Which of the following metal gives NH₄NO₃ with very dilute HNO₃ ?

• a) Fe
• b) Ti
• c) Cu
• d) Hg

Answer: Fe

Question:  In iodide of Millon’s base formed by the reaction of Nessler’s reagent with NH₃ , the coordination number of Hg will be

• a) 2
• b) 3
• c) 4
• d) 6

Answer: 2

Question:  The compound insoluble in aqueous NH₃ is

• a) AgI
• b) AgCl
• c) ZnSO₄
• d) HgCl₂

Answer: AgI

Question: A metal X when burnt in air, X-forms oxide and nitride both, X can be

• a) Rb
• b) Mg
• c) Na
• d) K

Answer: Mg

Question:  When Cu is reacted with hot concentrated solution of H₂SO₄ then the gas obtained is

• a) O₂
• b) H₂ 
• c) SO₂
• d) SO₃ 

Answer:  SO₂

Question:  In xenon fluorides most reactive in XeF₆, XeF₄ and XeF₂ is

• a) XeF₆
• b) XeF₂
• c) XeF₄   
• d) All are equally reactive

Answer:  XeF₆