CBSE Class 11 Chemistry s-Block Elements MCQs Set A

I. MCQ - Choose Appropriate Alternative

Question : The oxides of beryllium are.
(a) Acidic 
(b) Basic 
(c) Ba⁺² 
(d) Mg⁺²

Question : Which ion will have the maximum value of heat of hydration?
(a) Na⁺
(b) Cs⁺ 
(c) Ba⁺²
(d) Mg⁺²

Question : Which one of the following is not an alkali metal?
(a) Sodium sulphate
(b) Potassium sulphate 
(c) Zinc sulphate
(d) Barium sulphate

Question : The element cesium bears resemblance with.
(a) Ca
(b) Cr 
(c) Both of the above
(d) None of the above

Question : Chile saltpeter had the chemical formula
(a) NaNO₃ 
(b) KNO₃ 
(c) Na₂B₄O₇ 
(d) Na₂CO₃H₂O

Question : The ore CaSO₄2H₂O has the general name.
(a) Gypsum
(b) Dolomite
(c) Calcite
(d) Epsom salt

Question : Down's cell is used to prepare.
(a) Sodium carbonate 
(b) Sodium bicarbonate
(c) Sodium metal 
(d) Sodium hydroxide

Question : Which element is deposited at the cathode during the electrolysis of brine in Nelson's cell?
(a) H₂ 
(b) Na 
(c) CI₂ 
(d) O₂

Question : Ionic radius of potassium is.
(a) 60 pm
(b) 133 pm 
(c) 99 pm
(d) 169 pm

Question : Among alkaline Earth Metals, the highest heat of hydration is of.
(a) Be
(b) Sr 
(c) Rb
(d) Cs

Question : The chemical formula of sylvite is.
(a) Na₂CO₃. H₂O
(b) KCI 
(c) KCI. MgCL₂. 6H₂O
(d) NaCI

Question : The chemical formula of Alumite (Alum stone) is.
(a) KCI. MgCI₂. 6H₂O 
(b) KCI 
(c) Na₂B₄O₇. 10H₂O 
(d) K₂SO₄ Al(SO₄)₃. 2Al(OH)₃

Question : Among alkali metals the lowest atomic number is of.
(a) Rb
(b) K 
(c) Sr
(d) Li

Question : Due to the high reactivity nature of the alkali metals, they are found in.
(a) Free in nature 
(b) Bounded with other elements
(c) Not free in nature 
(d) All of the above

Question : Magnesium is an essential constituent of.
(a) Storaata
(b) Plants 
(c) ChlorophyII
(d) None of the above

Question : Which of the alkali earth metal has radioactive nature.
(a) Be
(b) Rb 
(c) Both of the above
(d) Na

Question : Calcium Phosphate Ca₃ (PO₄) and calcium fluoride CaF₂ are essential part of living organisms.
(a) Bones, egg shells
(b) teeth 
(c) Sea-shells
(d) All of the above

Question : Dolomite is a compound of which elements.
(a) Be
(b) Mg 
(c) Ca
(d) Ba

Question : The melting point and boiling point of which alkaline earth metal is high.
(a) Sr
(b) Mg 
(c) Be
(d) Na

Question : The super oxides are formed by the elements.
(a) K, Rb, Cs
(b) K, Na, Cs,
(c) K, Li, Na
(d) None of the above

Question : Potassium, rubidium and caeslium are so highly reactive that they react with ice even at.
(a) -100°C
(b) -200°C
(c) -50°C
(d) -0°C

Question : Among the alkaline earth metal which has least reactivity even upto 800°C
(a) Ba
(b) Cs
(c) Li
(d) Be

Question : Plaster of paris is formed after heating upto 100°C
(a) Mg(NO₃)₂
(b) CaSO₄, 2H₂O(gypsum)
(c) NaNO₂
(d) LiNO₃

Question : The root system of several plants have been greatly enlarged by the application of.
(a) Sulphur
(b) Gypsum
(c) Both of the above
(d) None of the above

Question : When deficiency of calcium exists various substances are accumulated in plants in harmful concentration which are.
(a) Lime 
(b) Aluminium
(c) Aliminium and Manganese 
(d) None of the above

Question : Which alkali metal behave different by from others?
(a) Mg
(b) Na   
(c) Rb
(d) Li

Question : Spodumene, petalite, halite, natron, alinite are the common minerals of.
(a) Alkali metals
(b) Alkaline earth metals
(c) Both of the above
(d) Li

Question : Sodium is prepared by the electrolysis of.
(a) Simple NaCI in Down,s cell
(b) Molten NaCI in Down,s cell
(c) Molten sodium hydroxide in down's cell
(d) None of the above

Question : Lime is used in.
(a) Glass industry
(b) Glass and paper industries
(c) Paper industries
(d) None of the above

Question : The elements which are very abundant in earth crust are__________
(a) Si & Aℓ
(b) Ca & Mg
(c) B & Aℓ
(d) All

Question : The oxides of Be are ___________
(a) Acidic
(b) Basic
(c) Amphoteric
(d) None

Question : Carbonates of lithium are not stable like that of sodium due to _____
(a) Low electronegativity
(b) Low electropositivity
(c) Low charge density
(d) Not know yet

Question : Which one of the following is not an alkali metal?
(a) Francium
(b) Caesium
(c) Rubidium
(d) Radium

Question : Which of the following sulphates is not soluble in water?
(a)Sodium sulphate
(b) Potassium sulphate
(c) Zinc sulphate
(d) Barium sulphate

Question : The ore CaSO₄.2H₂O has the general name____
(a) Gypsum
(b) Dolomite
(c) Sodium metal
(d) Sodium hydroxide

Question : Crystals of Na₂CO₃. 10H₂O when exposed to air, _______
(a) Lose water and remain solid
(b) Gain water and remain solid
(c) Gain water and become liquid
(d) Remains unchanged.

Question : The deliquescence is a process in which a solid________
(a) Absorbs moisture and remains solid
(b) Absorbs moisture and turns to liquid form
(c) Loses water of crystallization
(d) Increases the number of water of crystallization

Question : In diaphragm cell, level of brine in anode compartment is kept slightly higher which prevents
(a) Hydroxide ions to reach anode
(b) Chlorine gas to mix
c ) Anode to decay
(d) All

Question : Alkali metals form bonds
(a) Ionic
(b) Covalent
(c) Metallic
(d) Co-ordinate covalent

Question : The alkali metals, which have radioactive isotopes
(a) Li
(b) Na
(c) K
(d) K and Rb

Question : Halite is the mineral of
(a) Sodium
(b) Potassium
(c) Lithium
(d) Cesium

Question : Na₂SO₃.10H₂O is the mineral of sodium and is called
(a) Spodumene
(b) Halite
(c) Natron
(d) Sylvite

Question : Which one of the following is dolomite?
(a) MgCO₃
(b) MgCO₃.CaCO₃
(c) CaCO₃
(d) BaSO₄

Question : The high electrical conductivity of alkali metals is due to the
(a) Free motion of valence electrons
(b) High I.P
(c) Lesser atomic radii
(d) None of these

Question : Sodium imparts color to Bunsen flame
(a) Green
(b) Violet
(c) Blue
(d) Yellow

Question : All alkaline earth metals are white except
(a) Mg
(b) Ca
(c) Be
(d) Sr

Question : Metals, which are higher that water, are
(a) Alkaline earth metals
(b) Coinage metals
(c) Alkali metals
(d) All of these

Question : Except lithium, the hydroxides of all alkali metals are
(a) Strongly acidic
(b) Strongly basic
(c) Weakly basic
(d) All of these

Question : The carbonates and phosphates of which elements are insoluble in water
(a) Na and K
(b) Na and Be
(c) Li and Mg
(d) All of these

Question : All alkaline earth metals react with water at room temperature to release hydrogen and give basic solutions except
(a) Be and Ca
(b) Be and Mg
(c) Ca and Mg
(d) Mg and Sr

Question : Lithium only forms normal oxides when burnt on air but when sodium burnt in air it forms
(a) Normal oxides
(b) Sub oxides
(c) Peroxides
(d) Super oxides

Question : The super oxides of alkali metals are generally represented by
(a) M₂O
(b) M₂O₂
(c) MO₂
(d) M₂O₃

Question : The nitrates of which group decompose on heating with the formation of nitrites and evolution of oxygen
(a) IA     
(b) II A
(c) III A 
(d) IV A

Question : A small amount of calcium chloride or mixture of KCl and KF is added to NaCl in Down’s cell
(a) To make it good conductor
(b) To decrease the m.p of NaCl
(c) To increase the ionization of NaCl
(d) To decrease the ionization of NaCl

Question : Liquid sodium in the Down’s cell is collected at a temperature of
(a) 700°C
(b) 600°C
(c) 500°C
(d) 400°C

Question : The product, which is obtained at cathode in the Down’s cell is
(a) Liquid Sodium
(b) Dry chlorine
(c) Water
(d) Hydrogen

Question : Which is manufactured by the electrolysis of fused sodium chloride?
(a) NaOH
(b) NaHCO₃
(c) Na
(d) Na₂CO₃

Question : Which of the following does not conduct electricity?
(a) Boron
(b) Gallium
(c) Indium
(d) Thallium

Question : Which alkali metal is rare and found in a small amount in all – igneous rocks?
(a) Li
(b) Na
(c) K
(d) Fr

Question : The ingredient of baking powder is
(a) NaHCO₃
(b) NaOH
(c) Na₂CO₃
(d) NaCl