CBSE Class 11 Chemistry s-Block Elements MCQs Set B

Question : The formula of plaster of Paris is
(a) CaSO₄
(b) CaSO₄.H₂O
(c) CaSO₄.2H₂O
(d) 2CaSO₄.H₂O 

Question : Which of the following is fluorspar?
(a) CaO
(b) CaCO₃
(c) CaF₂
(d) NaOH

Question : Potassium is kept in
(a) Water
(b) Alcohol
(c) Ammonia
(d) Kerosene oil

Question : Which one has high m.p?
(a) NaCl
(b) NaBr
(c) Nal
(d) NaF

Question : Which one of the following is most basic?
(a) Al₂O₃
(b) SiO₂
(c) P₂O₅
(d) MgO

Question : Gypsum is
(a) CaSO₄.2H₂O
(b) CaSO₄.H₂O
(c) CaSO₄       
(d) MgSO₄

Question : Which one is commonly used as a laboratory desicator?
(a) Na₂CO₃
(b) NaCl
(c) CaCl₃
(d) NaOH

Question : The radioactive alkaline earth metal is
(a) Be
(b) Mg
(c) Ra
(d) Ba

Question : Which one of the following elements has its compounds which are diamagnetic and colourless?
(a) Be
(b) Sr
(c) Na
(d) All of these

Question : Which metal is an important component of transistors?
(a) Ag
(b) Au
(c) Ra
(d) Os

Question : Which impurities are present in common salt?
(a) Na₂SO₄
(b) CaSO₄
(c) CaCl₂
(d) All of these 

Question : K can displace Na from NaCl due to
(a) Greater I.P of K
(b) Greater I.P of Na
(c) More electropositivity of K
(d) More electropositivity of Na

Question : The alkali metal, which is artificially prepared
(a) Na
(b) Rb
(c) Fr
(d) Cs

Question : The chemical use for the production of CO₂ in the fire extinguishers is
(a) NaOH
(b) NaCl
(c) NaHCO₃ and dilute acid
(d) NaHCO₃ and NaOH

Question : LiCl is more soluble in organic solvents than NaCl because
(a) Li⁺¹ has higher heat of hydration than Na⁺
(b) Li⁺¹ has lower heat of hydration than Na⁺
(c) LiCl is more covalent than NaCl
(d) Lattice energy of NaCl is less than that of LiCl

Question : Which compound is used for uric acid treatment in human beings?
(a) Na₂CO₃
(b) NaHCO₃
(c) Li₂CO₃
(d) NaNO₃

Question : Which element is used in T.V picture tube?
(a) Na
(b) K
(c) Ca
(d) Cs

Question : Which one is used in the manufacture of chalk pencils?
(a) Marble
(b) Gypsum
(c) Epsom salt
(d) Baking soda

Question : Plaster of Paris has a structure
(a) Cubic
(b) Monoclinic
(c) Hexagonal
(d) Orthorhombic

Question : Potassium super oxide (KO₂) is used in breathing equipments for mountaineers and space craft because it absorb
(a) Oxygen and giving out CO₂ at the same time
(b) N₂ and giving out CO₂ at the same time
(c) CO₂ and giving out O₂ at the same time
(d) Pollutants and giving out O₂ at the same time

Question : The hydroxide, which is called milk of magnesium and is used for treatment of acidity in stomach, is
(a) Ca(OH)₂
(b) Mg(OH)₂
(c) Sr(OH)₂
(d) Ba(OH)₂

Question : Mg⁺² is smaller the Na+1 because
(a) Mg⁺² has fewer electron than Na⁺¹
(b) Mg⁺² has greater electron than Na⁺¹
(c) Mg⁺² has greater atomic number than Na⁺¹
(d) Mg⁺² has low I.P than Na⁺¹

Question : Which of them has almost same electronegativity?
(a) Be, B
(b) B, Al
(c) Be, Al
(d) K, Na

Question : A mixture formed by mixing one volume of slaked lime Ca(OH)₂ with three or four volume of sand and water to form a thick paste is called
(a) Lime water
(b) Dead water
(c) Quick lime
(d) Milk of lime

Question : If the compound has the same crystal structure and analogous formulae, they are called
(a) Isotopes
(b) Allotropes
(c) Isomers
(d) Isobars

Question : Out of all elements of group IA, the highest heat of hydration is for _______
(a) K
(b) Rb
(c) Cs
(d) Li

Question : The nitride ion in lithium nitride is composed of
(a) 7 protons and 7 electrons
(b) 10 protons and 7 electrons
(c) 10 protons and 10 electrons
(d) 10 protons and 5 electrons

Question : When NH₃ is passed over heated sodium at 300^oC, the product formed is
(a) NaNH₂
(b) NaNO₂
(c) Na(NH₃)₂
(d) Na₃N

Question : Sodium metal can be stored under
(a) Benzene
(b) Kerosene
(c) Alcohol
(d) Water

Question : Chile sulphur is
(a) NaNO₂
(b) KNO₂
(c) NaNO₃
(d) KNO₃

Question : Group 2 elements are called alkaline earth metals why? Choose the correct reason(s).
(i) Hydroxides formed by group 2 elements are alkaline in nature.
(ii) Their metal oxides are found in the earth’s crust.
(iii) Their oxides are alkaline in nature
(iv) Group 2 elements react with alkalies
a) (i), (ii) and (iii)
b) (i) and (ii)
c) (ii) and (iv)
d) (ii) and (iii)