Class 12 Chemistry Chapter 7 The p Block Elements MCQ Questions with Answers

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The P Block Elements Class 12 MCQ Questions with Answers

Class 12 Chemistry MCQ with answers are given here to chapter The P Block Elements. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 12 Chemistry syllabus. By Solving these Class 12 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 12 Annual exam.

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Question 1. Nitrogen forms N₂, but phosphorus does not form P₂, however, it converts P₄, reason is
(a) triple bond present between phosphorus atom
(b) pp – pp bonding is weak
(c) pp – pp bonding is strong
(d) multiple bonds form easily. 

Question 2. Which of the following oxides is most acidic?
(a) As₂O₅
(b) P₂O₅
(c) N₂O₅
(d) Sb₂O₅ 

Question 3. In which of the following compounds, nitrogen exhibits highest oxidation state?
(a) N₂H₄
(b) NH₃
(c) N₃H
(d) NH₂OH 

Question 4. Among the following oxides, the lowest acidic is
(a) As4O₆
(b) As4O₁₀
(c) P₄O₆
(d) P₄O₁₀ 

Question 5. Which of the following has the highest dipole moment?
(a) SbH₃
(b) AsH₃
(c) NH₃
(d) PH₃ 

Question 6. The basic character of hydrides of the V group elements decreases in the order
(a) NH₃ > PH₃ > AsH₃ > SbH₃
(b) SbH₃ > AsH₃ > PH₃ > NH₃
(c) SbH₃ > PH₃ > AsH₃ > NH₃
(d) NH₃ > SbH₃ > PH₃ > AsH₃ 

Question 7. Which one has the lowest boiling point?
(a) NH₃
(b) PH₃
(c) AsH₃
(d) SbH₃

Question 8. Number of electrons shared in the formation of nitrogen molecule is
(a) 6
(b) 10
(c) 2
(d) 8

Question 9. Which of the following fluorides does not exist?
(a) NF₅
(b) PF₅
(c) AsF₅
(d) SbF₅ 

Question 10. Which of the following statement 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 11. 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 12. Pure nitrogen is prepared in the laboratory by heating a mixture of
(a) NH₄OH + NaCl
(b) NH₄NO₃ + NaCl
(c) NH₄Cl + NaOH
(d) NH₄Cl + NaNO₂. 

Question 13. Aqueous solution of ammonia consists of
(a) H⁺
(b) OH^–
(c) NH⁴⁺
(d) NH⁴⁺ and OH^–.

Question 14. Which of the following oxides of nitrogen is paramagnetic?
(a) NO₂
(b) N₂O₃
(c) N₂O
(d) N₂O₅ 

Question 15. Urea reacts with water to form A which will decompose to form B. B when passed through Cu2+ (aq), deep blue colour solution C is formed. What is the formula of C from the following?
(a) CuSO₄
(b) [Cu(NH₃)₄]²⁺
(c) Cu(OH)₂
(d) CuCO₃·Cu(OH)₂

Question 16. Zn gives H₂ gas with H₂SO₄ and HCl but not with HNO₃ because
(a) Zn act as oxidising agent when react with HNO₃
(b) HNO3 is weaker acid than H₂SO₄ and HCl
(c) in electrochemical series Zn is above hydrogen
(d) NO₃– is reduced in preference to hydronium ion. 

Question 17. Which of the following is a nitric acid anhydride?
(a) NO
(b) NO₂
(c) N₂O₅
(d) N₂O₃

Question 18. When copper is heated with conc. HNO3 it produces
(a) Cu(NO₃)₂, NO and NO₂
(b) Cu(NO₃)₂ and N₂O
(c) Cu(NO₃)₂ and NO₂
(d) Cu(NO₃)₂ and NO 

Question 19. Which of the following phosphorus is the most reactive?
(a) Scarlet phosphorus
(b) White phosphorus
(c) Red phosphorus
(d) Violet phosphorus

Question 20. Aqua-regia is
(a) 1 : 3 cone. HNO₃ and cone. HCl
(b) 1 : 2 cone. HNO₃ and cone. HCl
(c) 3 : 1 conc. HNO₃ and cone. HCl
(d) 2 : 1 cone. HNO₃ and cone. HCl     

Question 21. Sugarcane on reaction with nitric acid gives
(a) CO₂ and SO₂
(b) (COOH)₂
(c) 2HCOOH(two moles)
(d) no reaction. 

Question 22. Which one of the following is used for the separation of noble gas mixture from air ? 
(a) Charcoal
(b) 90% CaC₂ + 10% CaCl₂
(c) Soda lime + potash solution
(d) 90% CaCO₃ + 10% urea   

Question 23. Which of the following is most volatile ? 
(a) HF
(b) HCI
(c) HBr
(d) HI   

Question 24. Under ambient conditions, the total number of gases released as products in the final step of the reaction scheme shown below is 

(a) 0
(b) 1
(c) 2
(d) 3     

Question 25. Molecules of a noble gas do not posses vibrational energy because a noble gas
(a) is monoatomic
(b) is chemically inert
(c) has completely filled shells
(d) is diamagnetic       

 Question 26. Which of the following pair have identical shape ?
(a) CH₄ , SF₄
(b) BCI₃ , ClF₃
(c) XeF₂, ZnCl₂
(d) SO₂ , CO₂     

Question 27. In Ramsay and Rayleigh’s isolation of noble gases from air, the nitrogen of the air is finally converted into
(a) NaNO₂ only
(b) NO and NO₂
(c) NaNO₃ only
(d) NaNO₂ and NaNO₃     

Question 28. Platinum, palladium and iridium are called noble metals because
(a) Alfred Nobel discovered them
(b) they are found in native state
(c) they are shining lustrous and pleasing to look at
(d) they are inert towards many common reagents     

Question 29. The correct order of pseudohalide, polyhalide and interhalogen are 
(a) BrI^–₂ , OCN^– , IF^–₅
(b) IF⁵ , BrI^–₂ , OCN^–
(c) OCN^– , IF₅ , BrI^–₂
(d) OCN- , BrI^–₂, IF₅   

Question 30. The structure of XeF₆ is experimentally determined to be distorted octahedron. Its structure according to VSEPR theory is
(a) octahedron
(b) trigonal bi pyramid
(c) pentagonal bi pyramid
(d) tetragonal bipyramid       

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Question 31. The structure of XeOF₄ is
(a) trigonal bipyramidal
(b) square planar
(c) square pyramidal
(d) pyramidal   

Question 32. The molecular ion XF₂ bas three pairs of non-bonding electrons around the central atom. The bond angle F—X—F will be closest to
(a) 180°
(b) 120°
(c) 109°
(d) 90°   

Question 33. Helium-oxygen mixture is used by deep sea divers in preference to nitrogen-oxygen mixture because 
(a) helium is much less soluble in blood than nitrogen
(b) nitrogen is much less soluble in blood than helium
(c) due to high pressure deep under the sea nitrogen and oxygen react to give poisonous nitric oxide
(d) nitrogen is highly soluble in water      

Question 34. Which of the following sets has the atoms and/or ions in the correct order of increasing size ? 
(a) Ne < F^– < O^2-
(b) Br^– < Cl^– < F^–
(c) Na⁺ < Mg²⁺ < Al³⁺
(d) P < S < Cl     

Question 35. Which of the following sets have correctly matched each molecule or ion and its geometry ? 

 

Question 36. Which of the following pairs contains isoelectronic species ? 
(a) Be and Li⁺
(b) p⁺ and s^–
(c) N^2- and Ne
(d) O^2- and Na⁺   

Question 37. Which of the following is the life saving mixture for an asthma patient? 
(a) Mixture of helium and oxygen
(b) Mixture of neon and oxygen
(c) Mixture of xenon and nitrogen
(d) Mixture of argon and oxygen     

Question 38. Which one of the following reaction of xenon compounds is not feasible? 
(a) XeO₃ + 6HF → XeF₆ + 3H₂O
(b) 3XeF₄ + 6H₂O → 2Xe + XeO₃+ 12HF + 1.5 O₂
(c) 2XeF₂ + 2H₂O → 2Xe + 4HF + O₂
(d) XeF₆ + RbF → Rb[XeF₇ ]     

Question 39. The unbalanced chemical reactions given in Column I show missing reagent or condition (?) which are provided in Column II. Match Column I with Column II and select the correct answer using the codes given below the columns. 

Column I	Column II
PBO2 + H2SO4 PbSO4 + O2 +Other Product	NO
Na2S2O3 +H2O NaHSO4 + Other Product	I2
N2H4 N2 + Other Product	warm
XeF2 Xe + Other product	Cl2

Codes 
     A  B  C  D  E
(a) 3  2  5  4  1
(b) 5  3  2  4  1
(c) 1  4  5  2  3
(d) 1  2  3  4  5     

Question 40. Each of the following is true for white and red phosphorus except that they
(a) are both soluble in CS₂
(b) can be oxidised by heating in air
(c) consist of the same kind of atoms
(d) can be converted into one another.

Question 41. A compound ‘X’ upon reaction with H₂O produces a colourless gas ‘Y’ with rotten fish smell. Gas ‘Y’ is absorbed in a solution of CuSO₄ to give Cu₃P₂ as one of the products. Predict the compound ‘X’.
(a) Ca₃P₂
(b) NH₄Cl
(c) As₂O₃
(d) Ca₃(PO₄)₂

Question 42. Argon is used 
(a) in filling airships
(b) to obtain low temperature
(c) in high temperature welding
(d) in radiotherapy for treatment of cancer     

Question 43. PCl₃ reacts with water to form
(a) PH₃
(b) H₃PO₃, HCl
(c) POCl₃
(d) H₃PO₄

Question 44. PH₄I + NaOH forms
(a) PH₃
(b) NH₃
(c) P₄O₆
(d) P₄O₁₀

Question 45. Identify the incorrect statement related to PCl5 from the following :
(a) PCl₅ molecule is non-reactive.
(b) Three equatorial P – Cl bonds make an angle of 120° with each other.
(c) Two axial P – Cl bonds make an angle of 180° with each other.
(d) Axial P – Cl bonds are longer than equatorial P – Cl bonds.

Question 45. Which is the correct statement for the given acids?
(a) Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid.
(b) Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid.
(c) Both are diprotic acids.
(d) Both are triprotic acids. 

Question 46. Strong reducing behaviour of H₃PO₂ is due to
(a) high electron gain enthalpy of phosphorus
(b) high oxidation state of phosphorus
(c) presence of two —OH groups and one P—H bond
(d) presence of one —OH group and two P—H bonds. 

Question 47. Which of the following oxoacids of phosphorus has strongest reducing property?
(a) H₄P₂O₇
(b) H₃PO₃
(c) H₃PO₂
(d) H₃PO₄

Question 48. How many bridging oxygen atoms are present in P₄O₁₀?
(a) 6
(b) 4
(c) 2
(d) 5

Question 49. 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 unit and one P—OH group.

Question 50. Oxidation states of P in H₄P₂O₅, H₄P₂O₆, H₄P₂O₇ are respectively
(a) +3, +5, +4
(b) +5, +3, +4
(c) +5, +4, +3
(d) +3, +4, +5

Question 51. P₂O₅ is heated with water to give
(a) hypophosphorous acid
(b) phosphorous acid
(c) hypophosphoric acid
(d) orthophosphoric acid. 

Question 52. H₃PO₂ is the molecular formula of an acid of phosphorus. Its name and basicity respectively are
(a) phosphorous acid and two
(b) hypophosphorous acid and two
(c) hypophosphorous acid and one
(d) hypophosphoric acid and two. 

Question 53. Which one of the following substance is used in the laboratory for fast drying of neutral gases?
(a) Phosphorus pentoxide
(b) Active charcoal
(c) Anhydrous calcium chloride
(d) Na₃PO₄ 

Question 54. Basicity of orthophosphoric acid is
(a) 2
(b) 3
(c) 4
(d) 5 

Question 55. Acidity of diprotic acids in aqueous solutions increases in the order
(a) H₂S < H₂Se < H₂Te
(b)H₂Se <H₂S < H₂Te
(c) H₂Te < H₂S < H₂Se
(d) H₂Se <H₂Te < H₂S

Question 56. When orthophosphoric acid is heated to 600°C, the product formed is
(a) PH₃
(b) P₂O₅
(c) H₃PO₃
(d) HPO₃

Question 57. Which is the correct thermal stability order for H2E (E = O, S, Se, Te and Po) ?
(a) H₂Se < H₂Te < H₂Po < H₂O < H₂S
(b) H₂S < H₂O < H₂Se < H₂Te <H₂Po
(c) H₂O < H₂S < H₂Se <H₂Te < H₂Po
(d) H₂Po < H₂Te < H₂Se < H₂S < H₂O 

Question 58. Which of the following does not give oxygen on heating?
(a) K₂Cr₂O₇
(b) (NH₄)2Cr₂O₇
(c) KClO₃
(d) Zn(ClO₃)₂

Question 59. Which of the following bonds has the highest energy?
(a) S–S
(b) O–O
(c) Se–Se
(d) Te–Te

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