Please refer to Chapter 11 The p-Block Elements MCQ Class 11 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 11 Chemistry. Students should refer to MCQ Questions for Class 11 Chemistry with Answers to score more marks in Grade 11 Chemistry exams. Students should read the chapter The p-Block Elements and then attempt the following objective questions.

MCQ Questions Class 11 Chemistry Chapter 11 The p-Block Elements

The The p-Block Elements MCQ Class 11 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. Boron halides behave as Lewis acids because of their ………. nature.
(a) proton donor
(b) covalent
(c) electron deficient
(d) ionising         

Question. Name of the alloy of aluminium which is used in aeroplane is 
(a) duralumin
(b) bell metal
(c) y-alloy (gamma alloy)
(d) aluminium bronze       

Question. Aluminium metal is refined by
(a) Serpeck’s process
(b) Baeyer’s process
(c) Hall’s process
(d) Hoope’s process     

Question. Which one of the following is the correct statement ?
(a) Boric acid is a protonic acid 
(b) Beryllium exhibits coordination number of six
(c) Chlorides of both beryllium and aluminium have b1idged chloride structures in solid phase
(d) B₂H₆ · 2NH₃ is known as inorganic benzene     

Question. Aluminium is obtained by
(a) reducing AI₂O₃ with coke
(b) electrolysing AI₂O₃ dissolved in Na₃AlF₆
(c) reducing AI₂O₃ with chromium
(d) heating alumina with cryolite   

Question. The correct statements for orthoboric acid is/are
(a) it behaves as a weak acid in water due to self ionisation
(b) acidity of its aqueous solution increases upon addition of ethylene glycol
(c) it has a three-dimensional structure due to hydrogen bonding
(d) it is a weak electrolyte in water     

Question. Aluminium oxide is not reduced by chemical reactions since
(a) reducing agent contaminate
(b) the process pollute the environment
(c) aluminium oxide is highly stable
(d) aluminium oxide is reactive   

Question. Bauxite ore is made up of Al₂O₃ + SiO₂ + TiO₂ + Fe₂O₃ . This ore is treated with cone. NaOH solution at 500 Kand 35 bar pressure for few hours and filtered hot. In the filtrate the species present, are 
(a) NaAl (OH)₄
(b) Na₂ Ti(OH)₆
(c) NaAl(OH)₄ and Na₂SiO₃
(d) Na₂SiO₃     

Question. Correct formula of aluminium nitride is 
(a) Al₂N₂
(b) AlN₃
(c) AlN₂
(d) AlN     

Question. Aluminium hydroxide, Al(OH)₃ is insoluble in water, but dissolves readily in both acidic and basic solutions. Such behaviour is characteristic of
(a) polyprotic behaviour
(b) hydrophilic behaviour
(c) a buffer
(d) amphoteric behaviour     

Question. For the properties mentioned the correct trend for the different species is in
(a) strength as Lewis acid – BCi₃ > AlCl₃ > GaCl₃
(b) inert pair effect – Al > Ga > In
(c) oxidising property – Al³⁺ > In³⁺ > Tl³⁺
(d) first ionisation enthalpy – B > Al > Tl   

Question. In alumino thermic process, Al is used as
(a) reducing agent
(b) oxidising agent
(c) catalyst
(d) electrolyte   

Question. BCI₃ + H₂O → X, the products formed in the reaction are
(a) B₂O₃ + HOCI
(b) H₃BO₃ + HCI
(c) B₂H₆ + HCl
(d) No reaction     

Question. The ratio of Fe₂O₃ and Al by weight in therrnite is
(a) 1: 3
(b) 1: 2
(c) 3: 1
(d) None of these   

Question. Potash alum dissolves in water to give a/an
(a) acidic solution of H₂SO₄
(b) alkaline solution
(c) acidic solution of HCI
(d) neutral solution   

Question. Aluminium chloride exists as dinmr, Al₂Cl₆ in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives
(a) Al³⁺ + 3Cl^–
(b) [Al(H₂O)₆]³⁺ + 3Cl^–
(c) [AI(OH)₆]^3- + 3HCI
(d) AI₂O₃ + 6HCI         

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     

Question. Which one of the following compounds, is not a protonic acid ?
(a) SO(OH)₂
(b) SO₂ (OH)₂
(c) B(OH)₃ 
(d) PO(OH)₃     

Question. The mass of carbon anode consumed (giving only carbon dioxide) in production of270 kg of aluminium metal from bauxite by the Hall process is (Atomic mass of Al = 27)
(a) 180 kg
(b) 270 kg
(c) 540 kg
(d) 90 kg       

Question. Alum is added to muddy water because
(a) it acts as disinfectant 
(b) it results in coagulation of clay and sand
(c) clay is soluble in alum, hence removes it
(d) it makes water alkaline which is good for health       

Question. An element ‘X’ which occurs in the first short period has an outer electronic structure s²p¹ • What is the formula and acid-base character of its oxides?
(a) XO₃ , basic
(b) X₂O₃ , basic
(c) X₂O₃ , acidic
(d) XO₂ , acidic       

Question. Which is a co1Tect statement about diborane structure?
(a) All HBH bond angles are equal
(b) All H—B bond lengths are equal
(c) It has two 3-centre-2 electron bonds
(d) All hydrogen and boron atoms are in one plane     

Question. Boron cannot form which one of the following anions?
(a) BF^3-₆
(b) BH^–₄
(c) B(OH)^–₄
(d) BO^–₂       

Question. Which one of the following correctly represents the variation of electronegativity (EN) with atomic number (Z) of group 13 elements?

Question. The chief impurity present in red bauxite is
(a) SiO₂
(b) Fe₂O₃
(c) K₂SO₄
(d) NaF       

Question. In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to
(a) minimise the heat loss due to radiation
(b) protect aluminium produced from oxygen
(c) dissolve bauxite and render it conductor of electricity
(d) lower the melting point of bauxite       

Question. Magnalium contains
(a) Al + Mg
(b) Mg + Cu
(c) Mg + Fe
(d) Mg + Ag   

Question. In diborane the two H—B—H angles are nearly
(a) 60°, 120°
(b) 97°, 120°
(c) 95°, 150°
(d) 120°, 180°     

Question. Inorganic benzene is 
(a) B₃H₃N₃
(b) BH₃NH₃
(c) B₃H₆N₃
(d) H₃B₃N₆       

Question. Alums are used for
(a) tanning of leather
(b) coagulation of blood
(c) purification of water
(d) All of these     

Question. Which of the following is a use of alum ? 
(a) Making explosives
(b) Bleaching clothes
(c) Water softening
(d) All of the above     

Question. Purification of Al by electrolysis method is called
(a) Hall’s process
(b) Baeyer process
(c) Ostwald process
(d) Hoope’s process       

Question. Aluminium reacts with caustic soda to form 
(a) aluminium hydroxide
(b) aluminium oxide
(c) sodium metaaluminate
(d) sodium tetraaluminate   

Question. Heating an aqueous solution of aluminium chlotide to dryness will give
(a) AI(OH)CI₂
(b) AI₂O₃
(c) AI₂Cl₆
(d) AICl₃     

Question. The order of acidic strength of boron trihalides
(a) BF₃ < BCI₃ < BBr₃ < BI₃ 
(b) BI₃ < BBr₃ < BCI₃ < BF₃
(c) BCI₃ < BBr₃ < BI₃ < BF₃
(d) BBr₃ < BCI₃ < BF₃ < BI₃
(e) BF₃ < BI₃ < BCI₃ < BBr₃     

Question. Observe the following statements regarding purification of bauxite.
I. During Hall’s process, silica is removed as Si (vapour).
II. Bauxite ore contaminated with Fe₂O₃ is purified in Baeyer’s process.
III. During Serpeck’s process, AIN is formed. The correct answer is
(a) I, II and III
(b) I and II
(c) I and III
(d) II and III     

Question. The structure of diborane (B₂H₆) contains
(a) four 2c -2e^– bonds and four 3c- 2e^– bonds
(b) two 2c-2e^– bonds and two 3c-2e^– bonds
(c) two 2c -2e^– bonds and four 3c – 2e^– bonds
(d) four 2 c -2e^– bonds and two 3c – 2e^–   

Question. In Goldschmidt aluminothermic process, thermite contains
(a) 3 parts of AI₂O₃ and 4 parts of Al 
(b) 3 parts of AI₂O₃ and 2 parts of Al
(c) 3 parts of AI₂O₃ and 1 part of Al
(d) 1 part of AI₂O₃ and 1 part of Al     

Question. Carbon cannot be used in the reduction of Al₂O₃ because
(a) it is an expensive proposition 
(b) the enthalpy of formation of CO₂ is more than that of Al₂O₃
(c) pure carbon is not easily available
(d) the enthalpy of formation of Al₂O₃ is too high     

Question. Tincal is
(a) Na₂CO₃ · 10H₂O
(b) NaNO3
(c) Na₂B₄O₇ · 10H₂O
(d) NaCl       

Question. Aluminium is extracted by the electrolysis of
(a) alumina
(b) bauxite
(c) molten cryolite
(d) alumina mixed with molten cryolite   

Question. Purification of alumina takes place by 
(a) Bosch process
(b) Hall’s process
(c) Hoope’s process
(d) quartation process     

Question. Boric acid is used in carrom boards for smooth gliding of pawns because
(a) H₃BO₃ molecules are loosely chemically bonded and hence soft
(b) its low density makes it fluffy
(c) it can be powdered to a very small grain size
(d) H-bonding in H₃BO₃ gives it a layered structure     

Question. Muddy water can be purified through coagulation by using
(a) common salt
(b) alums 
(c) sand
(d) lime     

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