The p Block Elements MCQ Class 12 Chemistry
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
Answer
D
Question. Which of the following has the highest pπ – pπ bonding tendency ?
(a) N
(b) P
(c) As
(d) Sb
Answer
A
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
Answer
B
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
Answer
A
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
Answer
D
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
Answer
B
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.
Answer
C
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
Answer
C
Question. Which is the best oxidising agent among the following ?
(a) S
(b) O
(c) Se
(d) Te
Answer
B
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
Answer
C
Question. Which of the following oxide is amphoteric ?
(a) SnO2
(b) CaO
(c) SiO2
(d) CO2
Answer
A
Question. Basicity of orthophosphoric acid is
(a) 2
(b) 3
(c) 4
(d) 5
Answer
B
Question.All the elements of oxygen family are
(a) non metals
(b) metalloids
(c) radioactive
(d) polymorphic
Answer
D
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
Answer
C
Question. Which of the following is not correctly matched ?
(a) SF4 – gas
(b) SeF4 – liquid
(c) TeF4 – solid
(d) SF6 – solid
Answer
D
Question. The structural formula of hypophosphorous acid is
![Worksheets Chapter 7 The p – Block Elements Class 12 Chemistry](https://worksheetsbag.com/wp-content/uploads/2022/05/image-24.png)
Answer
A
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
Answer
B
Question. Which of the following hydrides is most acidic ?
(a) H2Te
(b) H2Se
(c) H2O
(d) H2S
Answer
A
Question. The number of P – O – P bonds in cyclic metaphosphoric acid is
(a) zero
(b) two
(c) three
(d) four
Answer
C
Question. How many bridging oxygen atoms are present in P4O10?
(a) 5
(b) 6
(c) 4
(d) 2
Answer
B
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
Answer
D
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.
Answer
B
Question. White phosphorus is
(a) a monoatomic gas
(b) P4, a tetrahedral solid
(c) P8, a crown
(d) a linear diatomic molecule
Answer
B
Question. Which of the following is a cyclic phosphate ?
(a) H3P3O10
(b) H6P4O13
(c) H5P5O15
(d) H7P5O16
Answer
C
Question. PH3, the hydride of phosphorus is
(a) metallic
(b) ionic
(c) non-metallic
(d) covalent
Answer
D
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
Answer
A
Question. The number of P—O—P bonds in cyclic metaphosphoric acid is
(a) zero
(b) two
(c) three
(d) four
Answer
C
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
Answer
D
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
Answer
B
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
Answer
D
Question. Which of the following species has the highest dipole moment?
(a) NH3
(b) PH3
(c) AsH3
(d) SbH3
Answer
A
Question. The p-block element of group 15 that forms predominantly basic oxide is
(a) N
(b) P
(c) As
(d) Bi
Answer
D
Question. Collectively the elements of group 15 are called –
(a) pnicogens
(b) pnicopens
(c) nicopen
(d) None of these
Answer
A
Question. Which one has the lowest boiling point ?
(a) NH3
(b) PH3
(c) AsH3
(d) SbH3
Answer
B
Question. Which of the following fluorides does not exist?
(a) NF5
(b) PF5
(c) AsF5
(d) SbF5
Answer
A
Question. Most acidic oxide among the following is –
(a) N2O5
(b) P2O5
(c) N2O4
(d) As2O3
Answer
A
Question. Which one of the following elements is most metallic ?
(a) P
(b) As
(c) Sb
(d) Bi
Answer
D
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
Answer
B
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
Answer
B
Question. The shape of ammonia molecule is
(a) tetrahedral
(b) pyramidal
(c) planar triangle
(d) octahedral
Answer
B
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
Answer
B
Question. In which the NH3 is not used ?
(a) Cold storage
(b) Anaesthetic
(c) Manufacture of rayon and plastic
(d) None of these
Answer
B
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
Answer
A
Question. Maximum covalency of nitrogen is __________.
(a) 3
(b) 5
(c) 4
(d) 6
Answer
C
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
Answer
C
Question. Iodine is formed when potassium iodide reacts with a solution of
(a) ZnSO4
(b) CuSO4
(c) (NH4)z SO4
(d) Na2SO4
Answer
B
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,.
Answer
C
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
Answer
B
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
Answer
A,B
Question. The interhalogen having dimeric structure is
(a) CIF3
(b) BrF3
(c) IF3
(d) ICI3
Answer
D
Question. Among the following molecule which has the zero dipole moment ?
(a) BF3
(b) H2O
(c) NF3
(d) ClO2
Answer
A
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
Answer
D
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
Answer
A
Question. Which one is the anhydride of HClO4?
(a) ClO2
(b) Cl2O7
(c) Cl2O
(d) Cl2O6
Answer
B
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
Answer
D
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
Answer
B,C,D
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
Answer
C
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
Answer
B
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
Answer
A
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
Answer
B
Question. Which of the following is not a pseudohalide?
(a) RCOO–
(b) N3
(c) CNO3–
(d) CN–
Answer
A
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–
Answer
B
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
Answer
C
Question. In halogen’s group which element has highest electron affinity?
(a) F
(b) Cl
(c) Br
(d) I
Answer
B
Question. Which of the following oxides is neutral ?
(a) N2O3
(b) N2O4
(c) N2O5
(d) N2O
Answer
D
Question. Ammonia on reaction with hypochlorite anion can form :
(a) NO
(b) N2H4
(c) NH4Cl
(d) Both (b) and (c)
Answer
D
Question. The bonds present in N2O5 are :
(a) only ionic
(b) covalent and coordinate
(c) only covalent
(d) covalent and ionic
Answer
B
Question. Which of the following oxides of nitrogen is a coloured gas?
(a) N2O
(b) NO
(c) N2O5
(d) NO2
Answer
D
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
Answer
C
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
Answer
B
Question. NH3 gas is dried over :
(a) CaO
(b) HNO3
(c) P2O5
(d) CuSO4
Answer
A
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
Answer
B
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
Answer
B
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 .
Answer
A
Question. Concentrated nitric acid, upon long standing, turns yellow brown due to the formation of
(a) NO
(b) NO2
(c) N2O
(d) N2O4
Answer
B
Question. Which of the following elements does not form stable diatomic molecules ?
(a) Iodine
(b) Phosphorus
(c) Nitrogen
(d) Oxygen
Answer
B
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
Answer
D
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
Answer
A
Question. Which of the following trihalide is unstable?
(a) NF3`
(b) AsCl3
(c) SbBr3
(d) NCl3
Answer
D
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
Answer
C
Question. PH3, the hydride of phosphorus is
(a) metallic
(b) ionic
(c) non-metallic
(d) covalent
Answer
D
Question. Which of the following element will form acidic oxides of type E2O3?
(a) As
(b) Sb
(c) Bi
(d) P
Answer
D
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
Answer
B
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
Answer
B
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.
Answer
A
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.
Answer
D
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
Answer
B
Question. Which of the following can be used as an anaesthesia ?
(a) N2O
(b) NO
(c) NCl3
(d) NO2
Answer
A
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
Answer
C
Question. Which of the following phosphorus is most reactive ?
(a) Red phosphorus
(b) White phosphorus
(c) Scarlet phosphorus
(d) Violet phosphorus
Answer
B
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