Please refer to Chapter 7 The p Block Elements MCQ Class 12 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 12 Chemistry. Students should refer to MCQ Questions for Class 12 Chemistry with Answers to score more marks in Grade 12 Chemistry exams. Students should read the chapter The p Block Elements and then attempt the following objective questions.

MCQ Questions Class 12 Chemistry Chapter 7 The p Block Elements

The p Block Elements MCQ Class 12 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. Which of the follow group 15 element forms metallic bonds in elemental state ?
(a) As
(b) P
(c) Sb
(d) Bi

Question. Which of the following has the highest pπ – pπ bonding tendency ?           
(a) N
(b) P
(c) As
(d) Sb

Question. Which of the following statements is not correct for nitrogen?             
(a) Its electronegativity is very high
(b) d-orbitals are available for bonding
(c) It is a typical non-metal
(d) Its molecular size is small

Question. The three important oxidation states of phosphorus are           
(a) –3, +3 and +5
(b) –3, +3 and –5
(c) –3, +3 and +2
(d) –3, +3 and +4

Question. What causes nitrogen to be chemically inert ?           
(a) Multiple bond formation in the molecule
(b) Absence of bond polarity
(c) Short internuclear distance
(d) High bond energy

Question. Among the 15th group elements, as we move from nitrogen to bismuth, the pentavalency becomes less pronounced and trivalency becomes more pronounced due to               
(a) Non metallic character
(b) Inert pair effect
(c) High electronegativity
(d) Large ionization energy

Question. Pick out the wrong statement.             
(a) Nitrogen has the ability to form pπ-pπ bonds with itself.
(b) Bismuth forms metallic bonds in elemental state.
(c) Catenation tendency is higher in nitrogen when compared with other elements of the same group.
(d) Nitrogen has higher first ionisation enthalpy when compared with other elements of the same group.

Question. Nitrogen forms N₂, but phosphorus is converted into P₄ from P, the reason is
(a) Triple bond is present between phosphorus atom
(b) pπ – pπ bonding is strong
(c) pπ – pπ bonding is weak
(d) Multiple bond is formed easily

Question. Which is the best oxidising agent among the following ?
(a) S
(b) O
(c) Se
(d) Te

Question. Strong reducing behaviour of H₃PO₂ is due to
(a) Low oxidation state of phosphorus
(b) Presence of two –OH groups and one P–H bond
(c) Presence of one –OH group and two P–H bonds
(d) High electron gain enthalpy of phosphorus

Question. Which of the following oxide is amphoteric ?
(a) SnO₂
(b) CaO
(c) SiO₂
(d) CO₂

Question. Basicity of orthophosphoric acid is
(a) 2
(b) 3
(c) 4
(d) 5

Question.All the elements of oxygen family are
(a) non metals
(b) metalloids
(c) radioactive
(d) polymorphic

Question. H₃PO₂ is the molecular formula of an acid of phosphorus.Its name and basicity respectively are
(a) phosphorus acid and two
(b) hypophosphorous acid and two
(c) hypophosphorous acid and one
(d) hypophosphoric acid and two

Question. Which of the following is not correctly matched ?
(a) SF₄ – gas
(b) SeF₄ – liquid
(c) TeF₄ – solid
(d) SF₆ – solid

Question. The structural formula of hypophosphorous acid is

Question. Which of the following statements regarding allotropic forms of phosphorus is incorrect?
(a) White phosphorus is more reactive than red and black due to high angular strain.
(b) Red phosphorus on heating catches fire and give dense red fumes of P₄O₁₀.
(c) Red phosphorus is polymeric in nature consisting of chains of P₄ tetrahedral.
(d) Black phosphorus has two forms α-black and β-black phosphorus

Question. Which of the following hydrides is most acidic ?
(a) H₂Te
(b) H₂Se
(c) H₂O
(d) H₂S

Question. The number of P – O – P bonds in cyclic metaphosphoric acid is
(a) zero
(b) two
(c) three
(d) four

Question. How many bridging oxygen atoms are present in P₄O₁₀?
(a) 5
(b) 6
(c) 4
(d) 2

Question. Oxygen and sulphur both are the members of the same group in periodic table but H₂O is liquid while H₂S is gas because
(a) molecular weight of water is more
(b) electronegativity of sulphur is more
(c) H₂S is weak acid
(d) water molecules are having weak hydrogen bonds between them

Question. Which of the following statements is not valid for oxoacids of phosphorus?
(a) Orthophosphoric acid is used in the manufacture of triple superphosphate.
(b) Hypophosphorous acid is a diprotic acid.
(c) All oxoacids contain tetrahedral four coordinated phosphorus.
(d) All oxoacids contain atleast one P = O and one P —OH group.

Question. White phosphorus is
(a) a monoatomic gas
(b) P₄, a tetrahedral solid
(c) P₈, a crown
(d) a linear diatomic molecule

Question. Which of the following is a cyclic phosphate ?
(a) H₃P₃O₁₀
(b) H₆P₄O₁₃
(c) H₅P₅O₁₅
(d) H₇P₅O₁₆

Question. PH₃, the hydride of phosphorus is
(a) metallic
(b) ionic
(c) non-metallic
(d) covalent

Question. The oxyacid of phosphorous in which phosphorous has the lowest oxidation state is
(a) hypophosphorous acid
(b) orthophosphoric acid
(c) pyrophosphoric acid
(d) metaphosphoric acid

Question. The number of P—O—P bonds in cyclic metaphosphoric acid is
(a) zero
(b) two
(c) three
(d) four

Question. Oxidation states of P in H₄P₂O₅ , H₄P₂O₆ , and H₄P₂O₇ , are respectively:
(a) + 3, + 5, + 4
(b) + 5, + 3, + 4
(c) + 5, + 4, + 3
(d) + 3, + 4, + 5

Question. Pentavalence in phosphorus is more stable when compared to that of nitrogen even though they belong to same group. This is due to         
(a) dissimilar electronic configuration
(b) due to presence of vacant d-orbitals
(c) reactivity of phosphorus
(d) inert nature of nitrogen

Question. Nitrogen is relatively inactive element because         
(a) its atom has a stable electronic configuration
(b) it has low atomic radius
(c) its electronegativity is fairly high
(d) dissociation energy of its molecule is fairly high

Question. Which of the following species has the highest dipole moment?             
(a) NH₃
(b) PH₃
(c) AsH₃
(d) SbH₃

Question. The p-block element of group 15 that forms predominantly basic oxide is               
(a) N
(b) P
(c) As
(d) Bi

Question. Collectively the elements of group 15 are called –           
(a) pnicogens
(b) pnicopens
(c) nicopen
(d) None of these

Question. Which one has the lowest boiling point ?               
(a) NH₃
(b) PH₃
(c) AsH₃
(d) SbH₃

Question. Which of the following fluorides does not exist?             
(a) NF₅
(b) PF₅
(c) AsF₅
(d) SbF₅

Question. Most acidic oxide among the following is –             
(a) N₂O₅
(b) P₂O₅
(c) N₂O₄
(d) As₂O₃

Question. Which one of the following elements is most metallic ?           
(a) P
(b) As
(c) Sb
(d) Bi

Question. With respect to protonic acids, which of the following statements is correct ?
(a) PH₃ is more basic than NH₃
(b) PH₃ is less basic than NH₃
(c) PH₃ is equally basic as NH₃
(d) PH₃ is amphoteric while NH₃ is basic

Question. In Haber’s process for the manufacture of NH₃ :               
(a) finely divided nickel is used as a catalyst
(b) finely divided iron is used as a catalyst
(c) finely divided molybdenum is used as a catalyst
(d) no catalyst is necessary

Question. The shape of ammonia molecule is                   
(a) tetrahedral
(b) pyramidal
(c) planar triangle
(d) octahedral

Question. When ammonia is heated with cupric oxide, a molecule of ammonia will           
(a) gain 3 electrons
(b) lose 3 electrons
(c) gain 2 electrons
(d) lose 2 electrons

Question. In which the NH₃ is not used ?               
(a) Cold storage
(b) Anaesthetic
(c) Manufacture of rayon and plastic
(d) None of these

Question. PCl₅ is possible but NCl₅ does not exist :               
(a) in N, d-sub-shell is absent
(b) ionization energy of N is very high
(c) it does not like Cl
(d) None of these

Question. Maximum covalency of nitrogen is __________.           
(a) 3     
(b) 5
(c) 4
(d) 6

Question. Among the following oxoacids, the correct decreasing order of acid strength is
(a) HOCl > HCIO₂ > HCIO₃ > HCIO₃
(b) HCIO₄ > HOCI > HCIO₂ > HCIO₃
(c) HCIO₄ > HCIO₃ > HCIO₂ > HOCI
(d) HCIO₂ > HCIO₄ > HCIO₃ > HOCI   

Question. Iodine is formed when potassium iodide reacts with a solution of
(a) ZnSO₄
(b) CuSO₄
(c) (NH₄)z SO₄
(d) Na2SO₄   

Question. The high oxidising power of fluorine in due to its
(a) high electron affinity 
(b) high heat of dissociation and low heat of hydration
(c) low heat of dissociation and high heat of hydration
(d) high heat of dissociation and heat of hydrationt,.   

Question. MnO₂ + HCI →^Δ A (g) 
A(g) + F₂ ( excess) →^573K B (g)
B (l) +U (s) → C (g)+D (g)
The gases A, B, C and D are respectively
(a) Cl₂, ClF, UF₆, ClF₃
(b) Cl₂, CIF₃, UF₆, CIF
(c) O₂, OF₂, U₂O₃, O₂F₂
(d) O₂, O₂F₂, U₂O₃, OF₂   

Question. The hydrides of the first elements in groups 15-17, namely NH₃ , H₂O and HF respectively shows abnormally high values for melting and boiling points. This is due to
(a) small size of N, O and F 
(b) the ability to form extensive intermolecular H-bonding
(c) the ability to form extensive intramolecular H-bonding
(d) effective van der Waals’ interaction   

Question. The interhalogen having dimeric structure is 
(a) CIF₃
(b) BrF₃
(c) IF₃
(d) ICI₃     

Question. Among the following molecule which has the zero dipole moment ? 
(a) BF₃
(b) H₂O
(c) NF₃
(d) ClO₂     

Question. P and Q respectively, are the sodium salts of
(a) hypochlorous and chloric acids
(b) hypochlorous and chlorous acids
(c) chloric and perchloric acids
(d) chloric and hypochlorous acids   

Question. R, S andT,respectively, are 
(a) SO₂Cl₂, PCl₅ and H₃PO₄
(b) SO₂Cl₂, PCl₃ and H₃PO₃
(c) SO₂Cl₂ , PCl₃ and H₃PO₂
(d) SO₂Cl₂, PCl₅ and H₃PO₄     

Question. Which one is the anhydride of HClO₄? 
(a) ClO₂
(b) Cl₂O₇
(c) Cl₂O
(d) Cl₂O₆     

Question. Bleaching powder loses its power on keeping for a long time because 
(a) it changes into calcium hypochlorate
(b) it changes into calcium chloride and calcium hydroxide
(c) it absorbs moisture
(d) it changes into calcium chloride and calcium chlorate     

Question. Which of the following halides AgNO₃ ( aq) to give a precipitate reacts (s) with that dissolves in Na₂S₂O₃ (aq)?
(a) HCI
(c) HBr
(b) HF
(d) Hl       

Question. 25 mL of household bleach solution was mixed with 30 mL of 0.50 M KI and 10 mL of 4 N acetic acid. In the titration of the liberated iodine, 48 mL of 0.25 N Na₂S₂O₃ was used to reach the end point. The molarity of the household bleach solution, is 
(a) 0.48 M
(b) 0.96 M
(c) 0.24 M
(d) 0.024 M       

Question. In the manufacture of bromine from sea water, the mother liquor containing bromide is treated with 
(a) carbon dioxide
(b) chlorine
(c) iodine
(d) sulphur dioxide       

Question. Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid, is 
(a) Cl₂O
(b) Cl₂O₇
(c) ClO₂
(d) Cl₂O₆       

Question. Which of the following compounds gives chlorine dioxide when it reacts with SO₂ in the presence of acid ?
(a) Sodium chloride 
(b) Sodium chlorate
(c) Sodium perchlorate
(d) Sodium chlorite     

Question. Which of the following is not a pseudohalide? 
(a) RCOO^–
(b) N₃
(c) CNO₃^–
(d) CN^–       

Question. The relative basic character of the following is
(a) ClO^– < ClO₂^– < CIO₃^– < ClO₄^–
(b) CIO₄^– < CIO₃^– < ClO₂^–  < ClO^–
(c) CIO₃^– < CIO₄^– < ClO₂^–  < ClO^–
(d) ClO₂^–  < ClO^– < CIO₃^– < CIO₄^–         

Question. Which of the following is used to prepare Cl₂ gas at room temperature from concentrated HCl?
(a) MnO₂
(b) H₂S
(c) KMnO₄
(d) Cr₂O₃       

Question. In halogen’s group which element has highest electron affinity? 
(a) F
(b) Cl
(c) Br
(d) I     

Question. Which of the following oxides is neutral ?           
(a) N₂O₃
(b) N₂O₄
(c) N₂O₅
(d) N₂O

Question. Ammonia on reaction with hypochlorite anion can form :                 
(a) NO
(b) N₂H₄
(c) NH₄Cl
(d) Both (b) and (c)

Question. The bonds present in N₂O₅ are :             
(a) only ionic
(b) covalent and coordinate
(c) only covalent
(d) covalent and ionic

Question. Which of the following oxides of nitrogen is a coloured gas?                 
(a) N₂O
(b) NO
(c) N₂O₅
(d) NO₂

Question. In which one of the following oxides of nitrogen, one nitrogen atom is not directly linked to oxygen?       
(a) NO
(b) N₂O₄
(c) N₂O
(d) N₂O₃

Question. Elements of group-15 form compounds in +5 oxidation state. However, bismuth forms only one well characterised compound in +5 oxidation state. The compound is           
(a) Bi₂O₅
(b) BiF₅
(c) BiCl₅
(d) Bi₂S₅

Question. NH₃ gas is dried over :                     
(a) CaO
(b) HNO₃
(c) P₂O₅
(d) CuSO₄

Question. Liquid ammonia bottles are opened after cooling them in ice for sometime. It is because liquid NH₃         
(a) Brings tears to the eyes
(b) Has a high vapour pressure
(c) Is a corrosive liquid
(d) Is a mild explosive

Question. Which of the following oxides of nitrogen reacts with FeSO₄ to form a dark brown compound             
(a) N₂O
(b) NO
(c) NO₂
(d) N₂O₃

Question. The catalyst used in the manufacture of HNO₃ by Ostwald’s process is :             
(a) platinum gauze
(b) vanadium pentoxide
(c) finely divided nickel
(d) platinum black .

Question. Concentrated nitric acid, upon long standing, turns yellow brown due to the formation of               
(a) NO
(b) NO₂
(c) N₂O
(d) N₂O₄

Question. Which of the following elements does not form stable diatomic molecules ?
(a) Iodine
(b) Phosphorus
(c) Nitrogen
(d) Oxygen

Question. Which one of the following is not an use of ammonia ?                   
(a) To produce various nitrogenous fertilizers.
(b) In manufacture of nitric acid
(c) As a refrigerate
(d) In the pickling of stainless steel

Question. Which of the following is incorrect for white and red phosphorus ?               
(a) They are both soluble in CS₂
(b) They can be oxidised by heating in air
(c) They consist of the same kind of atoms
(d) They can be converted into one another

Question. Which of the following trihalide is unstable?                   
(a) NF_3`
(b) AsCl₃
(c) SbBr₃
(d) NCl₃

Question. One mole of calcium phosphide on reaction with excess water gives                 
(a) one mole of phosphine
(b) two moles of phosphoric acid
(c) two moles of phosphine
(d) one mole of phosphorus pentoxide

Question. PH₃, the hydride of phosphorus is               
(a) metallic
(b) ionic
(c) non-metallic
(d) covalent

Question. Which of the following element will form acidic oxides of type E2O₃?                     
(a) As
(b) Sb
(c) Bi
(d) P

Question. Phosphine is not obtained by which of the following reaction               
(a) White P is heated with NaOH
(b) Red P is heated with NaOH
(c) Ca₃P₂ reacts with water
(d) Phosphorus trioxide is boiled with water

Question. Which oxide of nitrogen is obtained on heating ammonium nitrate at 250ºC ?
(a) Nitric oxide
(b) Nitrous oxide
(c) Nitrogen dioxide
(d) Dinitrogen tetraoxide

Question. Which property of white phosphorus is common to red phosphorous ?                 
(a) It burns when heated in air.
(b) It reacts with hot caustic soda solution to give phosphine.
(c) It shows chemiluminescence.
(d) It is soluble in carbon disulphide.

Question. Phosphine is not evolved when
(a) white phosphorus is boiled with a strong solution of Ba(OH)₂             
(b) phosphorus acid is heated
(c) calcium hypophosphite is heated
(d) metaphosphoric acid is heated.

Question. Which of the following statements regarding allotropic forms of phosphorus is incorrect?               
(a) White phosphorus is more reactive than red and black due to high angular strain.
(b) Red phosphorus on heating catches fire and give dense red fumes of P₄O₁₀.
(c) Red phosphorus is polymeric in nature consisting of chains of P₄ tetrahedral.
(d) Black phosphorus has two forms ∝-black and β-black phosphorus

Question. Which of the following can be used as an anaesthesia ?             
(a) N₂O
(b) NO
(c) NCl₃
(d) NO₂

Question. A deep brown gas is formed by mixing two colourless gases which are               
(a) NO₂ and O₂
(b) N₂O and NO
(c) NO and O₂
(d) NH₃ and HCl

Question. Which of the following phosphorus is most reactive ?                 
(a) Red phosphorus
(b) White phosphorus
(c) Scarlet phosphorus
(d) Violet phosphorus

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