Students of class 11 Chemistry should refer to MCQ Questions Class 11 Chemistry The P-Block Elements with answers provided here which is an important chapter in Class 11 Chemistry NCERT textbook. These MCQ for Class 11 Chemistry with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 11 Chemistry. The following MCQs can help you to practice and get better marks in the upcoming class 11 Chemistry examination

Chapter 11 The P-Block Elements MCQ with Answers Class 11 Chemistry

MCQ Questions Class 11 Chemistry The P-Block Elements provided below have been prepared by expert teachers of grade 11. These objective questions with solutions are expected to come in the upcoming Standard 11 examinations. Learn the below provided MCQ questions to get better marks in examinations.

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

Question. When concentrated HNO₃ is heated with P₂O₅ it forms
(a) N₂O 
(b) NO
(c) NO₂
(d) N₂O₅           

Question. Mark the oxide which is amphoteric in character.
(a) CO₂
(b) SiO₂
(c) SnO₂
(d) CaO         

Question. Graphite is a soft, solid lubricant, extremely difficult to melt. The reason for this anomalous behaviour is that graphite
(a) is an allotropic form of diamond
(b) has molecules of variable molecular masses like polymers
(c) has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds
(d) is a non-crystalline substance       

Question. Carborundum is obtained when silica is heated at high temperature with
(a) carbon
(b) carbon monoxide
(c) carbon dioxide
(d) calcium carbonate       

Question. Among the following, the number of compounds that can react with PCl₅ to give POCl₃ is
          O₂, CO₂, SO₂, H₂O, H₂SO₄, P₄O₁₀.
(a) 1
(b) 2
(c) 3
(d) 4           

Question. Boron cannot form which one of the following anions? 
(a) BF₆³⁻
(b) BH₄⁻
(c) B(OH)₄⁻
(d) BO₂⁻       

Question. Among the following substituted silanes the one which will give rise to cross linked silicon polymer on
hydrolysis, is
(a) R₃SiCl
(b) R₄Si
(c) RSiCl₃
(d) _R2SiCl₂     

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. Nitrogen shows different oxidation states in the range
(a) 0 to +5
(b) −3 to +5
(c) −5 to +3
(d) −3 to+3           

Question. A hydride of nitrogen which is acidic is
(a) NH₃
(b) N₂H₄ 
(c) N₂H₂  
(d) N₃H         

Question. When conc. H₂SO₄ is heated with P₂O₅, the acid is converted to
(a) sulphur trioxide
(b) sulphur dioxide
(c) sulphur
(d) a mixture of sulphur dioxide and sulphur trioxide       

Question. The pair in which phosphorus atoms have a formal oxidation state of +3 is
(a) pyrophosphorus and hypophosphoric acids
(b) orthophosphorus and hypophophoric acids
(c) pyrophosphorus and pyrophosphoric acids
(d) orthophosphorus and pyrophosphorus acids         

Question. The compound that does not produce nitrogen gas by the thermal decomposition is 
(a) Ba(N₃)₂
(b) (NH₄)₂ C_r2O₇
(c) NH₄NO₂
(d) (NH₄)₂ SO₄         

Question. Extra pure N₂ can be obtained by heating
(a) NH₃ with CuO
(b) NH₄NO₃
(c) (NH₄)₂ Cr₂O₇
(d) Ba(N₃)₂             

Question. The number of s bonds in P₄O₁₀ is
(a) 6
(b) 16
(c) 20
(d) 7     

Question. White phosphorus on reaction with NaOH gives PH₃ as one of the products. This is a
(a) dimerisation reaction
(b) disproportionation reaction
(c) condensation reaction
(d) precipitation reaction             

Question. The molecule having smallest bond angle is
(a) NCl₃
(b) AsCl₃
(c) SbCl₃
(d) PCl₃               

Question. Name of the structure of silicates in which three oxygen atoms of [SiO₄]⁴⁻ are shared is
(a) pyrosilicate
(b) sheet silicate
(c) linear chain silicate
(d) three dimensional silicate     

Question. Which among the following is the most reactive?
(a) Cl₂
(b) Br₂
(c) I₂
(d) ICI       

Question. The catenation tendency of C, Si and Ge is in the order Ge < Si < C. The bond energies (in kJmol⁻¹ ) of C—C, Si—Si and Ge—Ge bonds are respectively
(a) 348, 297, 260
(b) 297, 348, 260
(c) 348, 260, 297
(d) 260, 297, 348         

Question. The number of S—S bonds in sulphur trioxide trimer (S₃O₉ ) is
(a) three
(b) two
(c) one
(d) zero             

Question. Which of the following are peroxoacids of sulphur?
(a) H₂SO₅ and H₂S₂O₈
(b) H₂SO₅ and  H₂S₂O₇
(c) H₂SO₇ and  H₂S₂O₈
(d) H₂SO₆ and  H₂S₂O₇             

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

Question. Which of the following statements is incorrect? 
(a) The stability of hydrides increases from NH₃ to BiH₃ in group 15 of the periodic table
(b) Nitrogen cannot form dp-pp bond
(c) Single N—N bond is weaker than the single P—P bond
(d) N₂O₄ has two resonance structures             

Question. The correct order of the thermal stability of hydrogen halides (H—X ) is
(a) HI > HCl > HF > HBr
(b) HCl < HF > HBr < HI
(c) HF > HCl > HBr > Hl
(d) Hl > HBr > HCl > HF           

Question. In curing cement plasters water is sprinkled from time to time. This helps in
(a) keeping it cool
(b) developing interlocking needle like crystals of hydrated silicates
(c) hydrating sand and gravel mixed with cement
(d) converting sand into silicic acid       

Question. Which one of the following compounds has the smallest bond angle in its molecule?
(a) OH₂
(b) SH₂
(c) NH₃
(d) SO₂               

Question. The solubility order of alkali metal fluoride in water is
(a) LiF < RbF < KF < NaF
(b) RbF < KF < NaF < LiF
(c) LiF > NaF > KF > RbF
(d) LiF < NaF < KF < RbF             

Question. Which of the following is the wrong statement?
(a) O₃ molecule is linear
(b) Ozone is violet black in solid state
(c) Ozone is diamagnetic gas
(d) ONCl and ONO⁻ are not isoelectronic         

Question. Which of the following statements regarding sulphur is incorrect?
(a) S₂ molecule is paramagnetic
(b) The vapour at 200°C consists mostly of S₈ rings
(c) At 600°C, the gas mainly consists of S₂ molecules
(d) The oxidation state of sulphur is never less than +4 in its compounds         

Question. The molecule BF₃ and NF₃ both are covalent compounds, but BF₃ is non-polar and NF₃ is polar. The reason is that
(a) boron is a metal and nitrogen is a gas in uncombined state
(b) BF₃ bonds have no dipole moment whereas NF₃ bond have dipole moment
(c) atomic size of boron is smaller than that of N₂
(d) BF₃ is symmetrical molecule whereas NF₃ is unsymmetrical         

Question. The structure of XeO₃ is
(a) linear
(b) planar
(c) pyramidal
(d) T-shaped               

Question. An inorganic compound containing (3c-2e⁻) and (2c-2e⁻) bonds when reacts with NH3, at a certain temperature, gives a compound ‘X’ which is isostructural with benzene and when reacts at high temperature forms a substance ‘ Y’. The substance ‘Y’ is
(a) B₂H₆
(b) B₃N₃H₆
(c) inorganic graphite
(d) B₂H₆ . 2NH₃           

Question. Which one has the highest boiling point?
(a) He
(b) Ne
(c) Kr
(d) Xe           

Question. Argon is used in arc welding because of its
(a) low reactivity with metal
(b) ability to lower the melting point of metal
(c) flammability
(d) high calorific value             

Question. In which of the following arrangements, the sequence is not strictly according to the property written against it?
(a) CO₂ < SiO₂ < SnO₂ < PbO₂ : increasing oxidising power
(b) HF < HCl < HBr < HI : increasing acid strength
(c) NH₃ < PH₃ < AsH₃ < SbH₃ : increasing basic strength
(d) B < C < O < N : increasing first ionisation enthalpy       

Question. The correct order of pseudohalide, polyhalide and interhalogen are
(a) BrI₂⁻ ,OCN⁻ , IF₅
(b) IF₅ , BrI₂⁻ ,OCN⁻
(c) OCN⁻ , IF₅ , BrI₂⁻
(d) OCN⁻ , BrI₂⁻ , IF₅             

Question. XeF₄ and XeF₆ are expected to be
(a) oxidising
(b) reducing
(c) unreactive
(d) strongly basic           

Question. Which of the following statements is true?
(a) H₃PO₃ is a stronger acid than H₂SO₃
(b) In aqueous medium, HF is a stronger acid than HCl
(c) HClO₄ is weaker acid than HClO₃
(d) HNO₃ is a stronger acid than HNO₂         

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

Question. Which of the following acids possesses oxidising, reducing and complex forming properties?
(a) HCl
(b) HNO₂
(c) H₂SO₄
(d) HNO₃               

Question. Identify the incorrect statement among the following.
(a) Ozone reacts with SO₂ to give SO₃
(b) Silicon reacts with NaOH (aq) in the presence of air tobgive Na₂ SiO₃ and H₂O
(c) Cl₂ reacts with excess of NH₃ to give N₂ and NH₄Cl 
(d) Br₂ reacts with hot and strong NaOH solution to givebNaBr, NaBrO₄ and H₂O         

Question. Among the following, the correct statement is :
(a) Between NH₃ and PH_3, NH₃ is a better electron donor because the lone pair of electrons occupies spherical ‘s’ orbital and is less directional
(b) Between NH₃ and PH₃, PH₃ is a better electron donor because the lone pair of electrons occupies sp³ orbital and is more directional
(c) Between NH₃ and PH₃, NH₃ is a better electron donor because the lone pair of electrons occupies sp³ orbital and is more directional
(d) Between NH₃ and PH₃, PH₃ is a better electron donor because the lone pair of electrons occupies spherical ‘s’ orbital and is less directional           

Question. The formation of O⁺₂ [PtF₆ ] is the basis for the formation of xenon fluorides. This is because
(a)O₂ and Xe have comparable sizes
(b) both O₂ and Xe are gases
(c)  O₂ and Xe have comparable I.E.
(d) Both (a) and (c)         

Question. Consider the following statements.
I. NCl₅ does not exist while PCl₅ does
II. Both O₂⁺ and NO are paramagnetic
III.Three C — O bonds are not equal in carbonate ion.
IV. Lead prefers to form tetravalent compound.
Which of the above statements are incorrect?
(a) I and III
(b) I, III and IV
(c) II and III
(d) III and IV           

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 forces of interaction             

Question. An inorganic compound ‘X’, made of two most occurring elements in the earth’s crust and used in building construction, when reacts with carbon forms a diatomic molecule, which is poisonous in nature. Compound ‘X’may be
(a) SiO₂
(b) Al₂O₃  
(c) CaO
(d) CO₂         

Question. Which one of the following reactions does not occur ?
(a) F² + Cl⁻ → 2F⁻ + Cl₂ 
(b) Cl₂ + 2F⁻ → 2Cl⁻ + F₂ 
(c) Br₂ + 2I⁻ → 2B r⁻ + I₂  
(d) Cl₂ + 2Br⁻ → 2Cl⁻ +Br₂           

Question. Boric acid is called acid because its molecule
(a) contains replaceable H⁺ ion 
(b) gives up a proton
(c) acceptsOH⁻ from water releasing proton
(d) combines with proton from water molecule         

Question. Heating of an aqueous solution of aluminium chloride to dryness will give
(a) Al(OH)Cl₂
(b) Al₂O₃
(c) Al₂Cl₆
(d) AlCl₃       

Question. B(OH)₃ + NaOH ⇌ NaBO₂ + Na[B(OH)₄ )] + H₂O How can this reaction is made to proceed in forward direction?
(a) Addition of cis 1, 2-diol
(b) Addition of borax
(c) Addition of trans 1, 2-diol
(d) Addition of Na₂HPO₄             

We hope the above multiple choice questions for Class 11 Chemistry for Chapter 13 The P-Block Elements provided above with answers based on the latest syllabus and examination guidelines issued by CBSE, NCERT and KVS are really useful for you. The P-Block Elements is an important chapter in Class 11 as it provides very strong understanding about this topic. Students should go through the answers provided for the MCQs after they have themselves solved the questions. All MCQs have been provided with four options for the students to solve. These questions are really useful for the benefits of class 11 students. Please go through these and let us know if you have any feedback in the comments section.