Please refer to Chapter 10 The s-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 s-Block Elements and then attempt the following objective questions.

MCQ Questions Class 11 Chemistry Chapter 10 The s-Block Elements

The The s-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. Sodium carbonate is manufactured by 
(a) Castner-Kellner
(b) Solvay process
(c) oxidation
(d) transmission process     

Question. In the reaction, NaOH + S → x + Na₂S + H₂O, x is
(a) Na₂SO₃
(c) Na₂SO₃
(b) Na₂SO₄
(d) Na₂S   

Question. Which property of Na₂S₂O₃ makes it useful in photography? 
(a) Photochemical property
(b) Complex formation property
(c) Oxidising agent
(d) Reducing agent       

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) Manganous hydroxide is soluble in excess of NaOH solution
(d) NaOH solution does not react with Cl   

Question. Which one of the following on hydrolysis, gives the cotTesponding metallic hydroxide, H₂O₂ and O₂ ?
(a) Li₂O
(b) Na₂O₂
(c) NaO₂
(d) Na₂O     

Question. Which of the following properties oflithium does not show diagonal relationship with magnesium?
(a) Formation of Li⁺ ion 
(b) Formation of Li₃N
(c) Solubility of LiHCO₃
(d) Thermal decomposition of Li₂CO₃     

Question. Which of the following statements are correct for alkali metal compounds?
I. Superoxides are paramagnetic in nanrre.
II. The basic strength of hydroxides increases the group.
III. The conductivity of chlorides in their aqueous solutions decreases down the group.
IV. The basic nanrre of carbonates in aqueous solutions is due to cationic hydrolysis. 
(a) I, II, and III
(b) I and II
(c) II, III and IV
(d) III and IV       

Question. The most electropositive element in alkali metals, is
(a) Na
(b) K 
(c) Rb
(d) Cs     

Question. The reaction between sodium and water can be made less vigorous by
(a) adding a little alcohol
(b) amalgamating sodium
(c) adding a little acetic acid
(d) lowering the temperature       

Question. Sodium peroxide which is a yellow solid, when exposed to air becomes white due to the formation of 
(a) H₂O₂
(b) Na₂O
(c) Na₂O and O₃
(d) NaOH and Na₂CO₃     

Question. Which of the following dissolves in hot cone. NaOH solution? 
(a) Fe
(b) Zn
(c) Cu
(d) Ag       

Question. The ionic conductance is least for 
(a) Cs⁺
(b) Rb⁺
(c) K⁺
(d) Na⁺     

Question. KI and CuSO₄ solution when mixed, give
(a) Cul₂ + K₂SO₄
(b) Cu₂l₂ + K₂SO₄
(c) K₂SO₄ + Cu₂l₂ + l₂
(d) K₂SO₄ + Cul₂ + l₂     

Question. Among the alkali metals caesium is the most reactive because 
(a) its incomplete shell is nearest to the nucleus
(b) it has a single electron in the valence shell
(c) it is the heaviest alkali metal
(d) the outem1ost electron is more loosely bound than the outermost electron of the other alkali metals     

Question. Baking powder contains
(a) NaHCO₃ , Ca(H₂PO₂)₂ and starch
(b) NaHCO₃ , Ca(H₂PO₂)₂
(c) NaHCO₃ and starch
(d) NaHCO₃     

Question. CaCI₂ is used as
(a) disinfectant
(c) medicine
(b) desiccating agent
(d) None of these       

Question. The chemical formula of plaster of Paris is 
(a) CaSO4 · 1/2 H₂O
(b) CaSO4 · H₂O
(c) CaSO4 · 2H₂OP
(d) CaSO4 · 3H₂O     

Question. The starting material used in Solvay’s process is
(a) sodium sulphate
(b) brine solution 
(c) carnallite
(d) All of these   

Question. In Down’s method for the extraction of sodium, the melting point of the electrolyte is lowered by adding
(a) potassium chloride 
(b) calcium chloride
(c) both calcium chloride and potassium fluoride
(d) potassium fluoride only     

Question. The carbonate that will not decompose on heating is
(a) Na₂CO₃
(b) CaCO₃
(c) BaCO₃ 
(d) SrCO₃       

Question. The solubility of alkali metal hydroxide is 
(a) LiOH < KOH < NaOH < RbOH < CsOH
(b) LiOH < NaOH < KOH < RbOH < CsOH
(c) CsOH < RbOH < KOH < NaOH < LiOH
(d) None of the above   

Question. Shine at freshly cut sodium is because of 
(a) due to oscillation of free electrons
(b) due to weak metallic bonding
(c) due to absorption of light in crystal lattice
(d) due to presence of free valency at the surface   

Question. When Na reacts with liquid NH₃ the following substance is formed 
(a) [Na (NH₃)_x]^–
(b) [e(NH₃)_y]^–
(c) NaNH₂
(d) Na_x (NH₃)_y       

Question. Pick out the statement (s) which is/are not correct about the diagonal relationship of Li and Mg.
I. Polarising powers of Li⁺ and Mg²⁺ are almost same.
II. Like Li, Mg decomposes water very fast.
III. LiCI and MgCl₂ are deliquescent.
IV. Like Li, Mg does not form solid bicarbonates.
(a) I and II
(b) II and III
(c) Only II 
(d) Only I     

Question. Which of the following exists in polymeric form ? 
(a) AICl₃
(b) BeCl₂
(c) B₂H₆
(d) SiC       

Question. What are the metal ions present in camallite? 
(a) Mg, K
(b) Al, Na
(c) Na, Mg
(d) Zn, Mg     

Question. The decomposition temperature is maximum for
(a) MgCO₃
(b) CaCO₃
(c) BaCO₃
(d) SrCO₃     

Question. The main product obtained when a solution of sodium carbonate reacts with mercuric chloride is
(a) Hg(OH)₂
(c) Hg CO₃
(b) Hg CO₃ ·HgO
(d) Hg CO₃ ·Hg (OH)₂     

Question. Which of the following reactions does not liberate gaseous product? 
(a) AlCl₃ + NaOH →
(b) NaOH + P (white)+ H₂O →
(c) Al + NaOH →
(d) Zn + NaOH →       

Question. The fommla of the product formed, when sodium thiosulphate solution is added to silver bromide is
(a) Ag₂S₂O₃
(b) Ag₂S 
(c) Na₃[Ag(S₂O₃)₂]
(d) Ag₃[Na (S₂O₃)₂]     

Question. KO₂ is used in space and submarines because it
(a) absorbs CO₂ and increases O₂ concentration
(b) absorbs moisture
(c) absorbs CO₂
(d) produces ozone     

Question. The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is
(a) Ag
(b) Ca
(c) Cu
(d) Cr       

Question. Usually, CaCI₂ is preferred over NaCl for cleaning snow on roads particulary in very cold countries. This is because
(a) NaCl makes the road slippery but CaCI₂ does not
(b) CaCI₂ is hygroscopic but NaCl is not
(c) CaCI₂ is less soluble in H₂ Othan NaCl
(d) eutectic mixture of CaCI₂ /H₂O freezes at – 55°C while that of NaCI/H₂O freezes at-18° C       

Question. Baking powder is more commonly used to make cakes or bread ‘rise’. FiHer in baking powder is 
(a) NaHCO₃
(b) Ca (H₂PO₄)₂
(c) starch
(d) NaAl(SO₄)₂     

Question. Which pair is different from the others? 
(a) Li—Mg
(b) B—Al
(c) Na—K
(d) Ca—Mg     

Question. The activity of alkaline earth metals as reducing agent
(a) decreases from Be to Ba 
(b) increases from Be to Ba
(c) increases from Be to Ca and decreases from Ca to Ba
(d) decreases from Be to Ca and increases from Ca to Ba     

Question. The species that is not hydrolysed in water is 
(a) P₄O₁₀
(b) BaO₂
(c) Mg₃N₂
(d) CaC₂   

Question. Which of the following represents the composition of camallite mineral?
(a) K₂O· Al₂O₃ · 6SiO₂
(b) KNO₃
(c) K₂SO₄ ·MgSO4 ·MgCI₂ ·6H₂O
(d) KCl-MgCI₂ ·6H₂O     

Question. In which of the following reaction, MgO is not formed?
(a) Mg + CO₂ →
(b) Mg + diI. HNO₃ →
(c) Mg + NO →^Δ
(d) Mg + B₂O₃ →   

Question. Which of the following substances has the highest melting point? 
(a) CaO
(b) BiCI₃
(c) KCl
(d) ClO₂   

Question. Which of the following on thermal decomposition yields basic as well as acidic oxide? 
(a) NaNO₃
(b) KCLO₃
(c) CaCO₃
(d) NH₄NO₃     

Question. In the presence of cobalt chloride, bleaching powder decomposes to form 
(a) CaCO₃ and O₃
(c) CI₂O and CaO
(b) ClO₂ and CaO
(d) CaCI₂ and O₂     

Question. A metal Mforms water soluble MSO₄ and inert MO. MO in aqueous solution forms insoluble M(OH)₂ soluble in NaOH. Metal M is
(a) Be
(b) Mg
(c) Ca
(d) Si   

Question. Out of following which compound is used for preservation of wood?
(a) NaCI
(b) HgCI₂
(c) ZnCI₂
(d) CaCI₂   

Question. Which of the following pairs of substances would give same gaseous product in reaction with water? 
(a) Na and Na₂O₂
(b) Ca and CaH₂
(c) Ca and Cao
(d) Ba and BaO₂
(e) Ca and CaC₂       

Question. Which of the following carbonates decomposes at lowest temperature? 
(a) MgCO₃
(b) CaCO₃
(c) SrCO₃
(d) BaCO₃     

Question. Which pair of the following chlorides does not impart colour to the flame ? 
(a) BeCI₂ and CrCI₂
(b) BeCI₂ and MgCI₂
(c) CaCI₂ and BaCI₂
(d) BaCI₂ and SrCI₂     

Question. The solubilities of carbonates decrease 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. The substance used in Holme’s signal of the ship is a mixture of 
(a) CaC₂ + Ca₃P₂
(b) Ca₃ (PO₄ )₂ + Pb₃O₄
(c) H₃PO₄ + CaCl₂
(d) NH₃ + HOCl     

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 substances is used in the laboratory for a fast drying of neutral gases? 
(a) Phosphorus pentoxide
(b) Active charcoal
(c) Anhydrous calcium chloride
(d) Na₃PO₄   

Question. Setting of plaster of Paris involves 
(a) oxidation with atmospheric oxygen
(b) combination with atmospheric CO₂
(c) dehydration    
(d) hydration to yield another hydrate   

Question. A compound X on heating gives a colourless gas. This residue is dissolved in water to obtain Y. Excess CO₂ is bubbled through aqueous solution of Y when Z is formed. Z on gentle heating gives back X. The Xis 
(a) CaCO₃
(b) Ca (HCO₃)₂
(c) Na2CO₃
(d) NaHCO₃     

Question. Milk of magnesia is used as 
(a) antichlor
(b) antacid
(c) antiseptic
(d) food preservative     

Question. Ionic compound BaSO₄ is insoluble in water due to
(a) high lattice energy 
(b) low lattice energy
(c) low hydration energy
(d) Both (b) and (c)     

Question. The substance not likely to contain CaCO₃ is 
(a) a marble statue
(b) calcined gypsum
(c) sea shells
(d) dolomite     

Question. Which of the following hydroxides is amphoteric in nature?
(a) Be(OH)₂
(b) Mg (OH)₂
(c) Ca(OH)
(d) Ba (OH)₂       

Question. Mixture of MgCI₂ and MgO is called 
(a) Portland cement
(b) Sorel’s cement
(c) double salt
(d) None of these       

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