Students of class 11 Chemistry should refer to MCQ Questions Class 11 Chemistry The S-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 10 The S-Block Elements MCQ with Answers Class 11 Chemistry

MCQ Questions Class 11 Chemistry The S-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. Which of the following reacts with water at a high rate?
(a) Li
(b) K
(c) Na
(d) Rb     

Question. The main oxides formed on combustion of Li, Na and K in excess of air respectively are 
(a) LiO₂ , Na₂O₂ and K₂O
(b) Li₂O₂ , Na₂O₂ and KO₂ 
(c) Li₂O, Na₂O₂ and KO₂ 
(d) Li₂O, Na₂O and KO₂       

Question. Sodium is heated in air at 350°C to form A. Compound A when reacts with carbon dioxide forms sodium carbonate andY. Here,Y is
(a) hydrogen peroxide
(b) hydrogen
(c) ozone
(d) oxygen       

Question. The ionic conductance of following cation in a given concentration are in the order
(a) Li⁺ < Na⁺ < K⁺ < Rb⁺
(b) Li⁺ > Na⁺ > K⁺ > Rb⁺
(c) Li⁺ < Na⁺ > K⁺ > Rb⁺
(d) Li⁺ = Na⁺ < K⁺ < Rb⁺       

Question. The reducing power of a metal depends on various factors. Suggest the factor which makes Li, the strongest reducing agent in aqueous solution.
(a) Sublimation enthalpy
(b) Ionisation enthalpy
(c) Hydration enthalpy
(d) Electron gain enthalpy     

Question. When CO is passed over solid NaOH heated to 200°C, it forms
(a) Na₂CO₃
(b) H₂CO₃
(c) HCOONa
(d) All of these         

Question. The metallic sodium dissolves in liquid ammonia to form a deep blue coloured solution. The deep blue colour is due to the formation of
(a) solvated electron, e⁻(NH₃)_x
(b) solvated atomic sodium, Na (NH₃)4
(c) (Na⁺ + Na⁻)
(d) NaNH₂ + H₂           

Question. The solubilities of carbonates decreases down the magnesium group due to decrease in
(a) lattice energies of solids
(b) hydration energies of cations
(c) interionic attraction
(d) entropy of solution formation         

Question. Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?
(a) CaSO₄
(b) BeSO₄
(c) BaSO₄
(d) SrSO₄             

Question. The solubilities of carbonates decrease down the group due to a decrease in
(a) lattice energies of solid
(b) hydration energies of cations
(c) interionic attraction
(d) entropy of solution formation     

Question. Consider the following abbreviations for hydrated alkali ions.
X = [Li(H₂O)_n ]⁺ ; Y = [K(H₂O_n) ]⁺ ; = [Cs(H₂O)_n ]⁺
What is the correct order of size of these hydrated alkali ions?
(a) X > Y > Z
(b) Z > Y > X
(c) X = Y = Z
(d) Z > X > Y         

Question. The gas evolved on heating Na₂CO₃ is
(a) CO₂
(b) water vapour
(c) CO
(d) No gas is evolved         

Question. The electronic configuration of metal M is 1s². 2s²2p⁶. 3s¹. The formula of its oxide would be
(a) MO
(b) M₂O
(c) M₂O₃ 
(d) MO₂        

Question. Which one of the following is true?
(a) NaOH is used in the concentration of bauxite ore
(b) NaOH is a primary standard in volumetric analysis
(c) Managanous hydroxide is soluble in excess of NaOH solution
(d) NaOH solution does not react with Cl       

Question. The correct order of increasing ionic character is
(a) BeCl₂ < MgCl₂ < CaCl₂ < BaCl₂ 
(b) BeCl₂ < MgCl₂ < BaCl₂ < CaCl₂
(c) BeCl₂ < BaCl₂ < MgCl₂ < CaCl₂
(d) BeCl₂ < CaCl₂ < MgCl₂ < BaCl₂         

Question. Among Na⁺, Na, Mg andMg²⁺ the largest particle is
(a) Mg²⁺
(b) Mg
(c) Na
(d) Na⁺       

Question. The stability of the following alkali metal chlorides follows the order
(a) LiCl > KCl > NaCl > CsCl
(b) CsCl > KCl > NaCl > LiCl
(c) NaCl > KCl > LiCl > CsCl 
(d) KCl > CsCl > NaCl > LiCl     

Question. Which pair of the following chlorides does not impart colour to the flame?
(a) BeCl₂ and SrCl₂
(b) BeCl₂ andMgCl₂
(c) CaCl₂ and BaCl₂
(d) BaCl₂ and SrCl₂       

Question. On dissolving moderate amount of sodium metal in liquid NH₃ at low temperature, which one of the following does not occur ?
(a) Blue coloured solution is obtained
(b)Na + ions are formed in the solution
(c) Liquid NH₃ solution becomes good conductor of electricity
(d) Liquid NH₃ solution remains diamagnetic       

Question. The atomic radius for Li and Li⁺ are 1.23 Å and 0.76 Å respectively. Assuming that the difference in ionic radii relates to the space occupied by 2s-electrons. What will be the % of volume of Li atom occupied by single valence electron?
(a) 700 . %
(b) 300 . %
(c) 24.75%
(d) 76.34%   

Question. Metal carbonates decompose on heating to give metal oxide and carbon dioxide. Which of the metal carbonates is most stable thermally?
(a) MgCO₃
(b) CaCO₃
(c) SrCO₃
(d) BaCO₃           

Question. 0.2 g of magnesium ribbon was placed in a crucible and heated with a lid on until the magnesium began to burn rapidly. At the end of the experiment there was 0.3 g of a white powder left. This result does not agree with the equation; 2Mg(s) + O₂(g) → 2MgO(s). It can be due, to
(a) some MgO may have escaped as vapours
(b) some Mg may not have reacted
(c) someMg₃N₂ can be formed
(d) All of the above   

Question. Which of the following statements are true about Ca(OH)₂?
(a) It is used in the preparation of bleaching powder
(b) It is a light blue solid
(c) It does not possess disinfectant property
(d) It is used in the manufacture of cement       

Question. A metalM readily forms water solubleMSO₄ . It also forms oxideMO which becomes inert on heating. Hydroxide M(OH)₂ is insoluble in water but soluble in NaOH solution. What is M?
(a) Mg
(b) Ba
(c) Ca
(d) Be       

Question. Mg has favourbale standard reduction electrode potential (E ° _Mg²⁺/Mg = −2.37 V ) but it does not react readily. It is because of
(a) its resemblance to Li
(b) formation of protective oxide layer
(c) its oxidising nature
(d) its reaction with acids   

Question. Among the following, which is insoluble in water?
(a) Sodium fluoride
(b) Potassium fluoride
(c) Beryllium fluoride
(d) Magnesium fluoride       

Question. Choose the incorrect statement.
(a) BeCO₃ is kept in the atmosphere of CO₂ since, it is least thermally stable
(b) Be dissolves in alkali forming [Be(OH)₄ ]^2–
(c) BeF₂ forms complex ion with NaF in which Be goes with cation
(d)BeF₂ forms complex ion with NaF in which Be goes with anion   

Question. Amphoteric hydroxides react with both alkalies and acids.Which of the following group 2 metal hydroxides is soluble in sodium hydroxide?
(a) Be(OH)₂
(b) Mg(OH)₂
(c) Ca(OH)₂
(d) Ba(OH)₂         

Question. Which of the following on thermal decomposition yields a basic as well as acidic oxide? 2
(a) NaNO₃
(b) KClO₃
(c) CaCO₃
(d) NH₄NO₃         

Question. A binary salt of potassium‘ A’ gives compound ‘B’ when heated with S. Compound ‘B’ forms white precipitate ‘C’ with barium chloride which is insoluble in conc.HCl. 7.1 g of ‘ A’ gave 11.15 g of white precipitate ‘C’. The compound ‘ A’ is
(a) KO₂
(b) K₂SO₄
(c) KOH
(d) K₂CO₃       

Question. Element A burns in nitrogen to give an ionic compound B. Compound B reacts with water to give C andD. The solution of C becomes milky on bubbling carbon dioxide. The element A is
(a) Li
(b) Mg
(c) Ca
(d) Be     

Question. Which of the following statements(s) is/are correct?
(a) Group 2 metals are denser and harder than group 1 metals
(b) Group 1 metals are less electropositive than group 2 metals
(c) The first ionisation energy of group 1 metals is more than that of group 2 metals
(d) All of the above statements are incorrect           

Question. A mixture contains two moles of Na₂CO₃ and 1 mole of Li₂CO₃. What will be the volume of CO₂ formed on heating this mixture and the data is converted to STP?
(a) 22.4 L
(b) 44.8 L
(c) 50.2 L
(d) 11.2 L       

Question. In group 2, the electrons are more firmly held to the nucleus and hence
(a) ionisation energy of group 2 is greater than group 1
(b) atoms of group 2 are bigger than group 1
(c) reactivity of group 2 is greater than group 1
(d) group 2 metals are less abundant in nature     

Question. In context with beryllium, which one of the following statements is incorrect?
(a) It is rendered passive by nitric acid
(b) It forms Be₂C 
(c) Its salts are rarely hydrolysed
(d) It hydride is electron-deficient and polymeric       

Question. A chemical A is used for the preparation of washing soda to recover ammonia. WhenCO2 is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of A?
(a) Ca (HCO₃)₂
(b) CaO
(c) Ca(OH)₂
(d) CaCO₃       

  Question. Select the correct statements(s).
(a) CaCO₃ is more soluble in a solution of CO₂ than in H₂O 
(b) Na₂CO₃ is converted toNa O₂ and CO₂ on heating
(c) Li₂CO₃ is thermally stable
(d) Presence of CaCl₂ or CaSO₄ in water causes temporary hardness     

Question. Beryllium and aluminium exhibit many properties which are similar but the two elements differ in
(a) exhibiting maximum covalency in compounds
(b) forming polymeric hydrides
(c) tendency of forming chelate type complexes.
(d) exhibiting amphoteric nature in their oxides       

Question. Some of the group 2 metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is
(a) BeCl₂
(b) MgCl₂
(c) CaCl₂
(d) SrCl₂     

Question. The charge/size ratio of a cation determines its polarising power. Which one of the following sequences represents the increasing order of the polarising power of cationic species; K⁺ , Ca²⁺ ,Mg²⁺ ,Be²⁺ ?
(a) Mg²⁺ < Be²⁺ < K⁺ < Ca²⁺  
(b) Be²⁺ < K⁺ < Ca²⁺ Mg²⁺ 
(c)  K⁺ < Ca²⁺ < Mg²⁺ < Be²⁺ 
(d) Ca²⁺ < Mg²⁺ < Be²⁺ < K⁺     

Question. A sodium salt on treatment withMgCl2 gives white precipitate only on heating. The anion of sodium salt is
(a) HCO₃⁻
(b) CO₃²⁻
(c) NO₃⁻
(d) SO₄²⁻     

Question. Solubility of alkaline earth metal sulphates decreases down the group 2 because
(a) they become more ionic
(b) lattice energy of sulphates does not vary significantly
(c) hydration energy decreases rapidly from Be²⁺ to Ba²⁺
(d) lattice energy plays more predominant role than hydration energy         

Question. Dehydration of hydrates of halides of calcium, barium and strontium, i.e. CaCl₂, 6H₂O, BaCl₂, 2H₂O, SrCl₂, 2H₂O, can be achieved by heating.
These become wet on keeping in air. Which of the following statements are correct about these halides?
(a) Act as dehydrating agent
(b) Can absorb moisture from air
(c) Tendency to form hydrate decreases from to barium
(d) All of the above     

Question. The characteristic not related to alkali metal is
(a) high ionisation energy
(b) their ions are isoelectronic with noble gases
(c) low melting point
(d) low electronegativity     

Question. Solubility of the alkaline earth’s metal sulphates in water decreases in the sequence
(a) Mg > Ca > Sr > Ba
(b) Ca > Sr > Ba > Mg
(c) Sr > Ca > Mg > Ba
(d) Ca > Mg > Sr > Ca       

We hope the above multiple choice questions for Class 11 Chemistry for Chapter 10 The S-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 S-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.