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The s-Block Elements Class 11 MCQs Questions with Answers
Multiple Choice Type Questions
Question 1.
The paramagnetic species is
(a) KO2
(b) SiO2
(c) TiO2
(d) BaO2
Answer
Answer: (a) KO2
Question 2.
On dissolving moderate amount of sodium metal in liquid ammonia 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 becomes good conductor of electricity
(d) Liquid ammonia remain diamagnetic.
Answer
Answer: (d) Liquid ammonia remain diamagnetic.
Question 3.
The substance not likely to contain CaCO3 is
(a) Dolomite
(b) A marble
(c) Calcined gypsum
(d) Sea shells.
Answer
Answer: (c) Calcined gypsum
Question 4.
TLe active constituent of bleaching powder is
(a) Ca(OCl)2
(b) Ca(OCl)Cl
(c) Ca(ClO2)
(d) Ca(ClO2)Cl
Answer
Answer: (b) Ca(OCl)Cl
Question 5.
Which of the following is the correct order of gradually descreasing basic nature of the oxides?
(a) Al2O3, MgO, Cl2O7, SO3
(b) Cl2O7, SO3, Al2O3, MgO
(c) SO3, Cl2O7, MgO, Al2O3
(d) MgO, Al2O3, SO3, Cl2O7
Answer
Answer: (d) MgO, Al2O3, SO3, Cl2O7
Question 6.
Among the alkaline earth metals, the element forming the predominantly covalent compound is
(a) Barium
(b) Strontium
(c) Calcium
(d) Beryllium.
Answer
Answer: (d) Beryllium.
Question 7.
Which of the following substances can be used for drying gases?
(a) Calcium carbonate
(b) Sodium carbonate
(c) Sodium bicarbonate
(d) Calcium oxide
Answer
Answer: (d) Calcium oxide
Question 8.
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
Answer
Answer: (a) LiCl > KCl > NaCl > CsCl
Question 9.
Solubilities of carbonates decrease down the Magnesium group due to decrease in
(a) Entropy of solution formation
(b) Lattice energies of solids
(c) Hydration energy of cations
(d) Inter-ionic attraction.
Answer
Answer: (c) Hydration energy of cations
Question 10.
In curing cement plasters, water is sprinkled from time to time. This helps in
(a) Converting sand into silicic acid
(b) Keeping it cool.
(c) Developing interlocking like crystals of hydrated silicates
(d) Hydrating sand and gravel mixed with cement.
Answer
Answer: (c) Developing interlocking like crystals of hydrated silicates
Question 11.
Bleaching powder loses its power on keeping for a long time because
(a) It changes into calcium hypochlorite
(b) It changes into calcium chloride and calcium hydroxide
(c) It absorbs moisture
(d) It changes into calcium chloride and calcium chlorate
Answer
Answer: (d) It changes into calcium chloride and calcium chlorate
Question 12.
A metal M readily forms water soluble sulphate MSO4, water insoluble hydroxide M(OH)2 and oxide MO which becomes inert on heating. The hydroxide is soluble in NaOH. The metal M is
(a) Be
(b) Mg
(c) Ca
(d) Sr
Answer
Answer: (a) Be
Question 13.
KO2 (Potassium superoxide) is used in oxygen cylinders in space and submarines because it
(a) Absorbs CO2 and increases O2 content
(b) Eliminates moisture
(c) Absorbs CO2
(d) Produces ozone
Answer
Answer: (a) Absorbs CO2 and increases O2 content
Question 14.
Which one is used as an air purifier in space craft?
(a) Quick lime
(b) Slaked lime
(c) Potassium superoxide
(d) Anhydrous CaCl2
Answer
Answer: (c) Potassium superoxide
Question 15.
The correct order of increasing ionic character is
(a) BeCl2 < MgCl2 < CaCl2 < BaCl2
(b) BeCl2 < MgCl2 < BaCl2 < CaCl2
(c) BeCl2 < BaCl2 < MgCl2 < CaCl2
(d) BaCl2 < CaCl2 < MgCl2 < BeCl2
Answer
Answer: (a) BeCl2 < MgCl2 < CaCl2 < BaCl2
Question 16.
Epsom salt is
(a) MgSO4.7H2O
(b) CaSO4H2O
(c) MgSO4.22O
(d) BaSO42H2O
Answer
Answer: (a) MgSO4.7H2O
Question 17.
For two ionic solids CaO and KI, identify the wrong statement from the following
(a) Lattice energy of CaO is much higher than that of KI
(b) KI is soluble in benzene
(c) CaO has high M.Pt
(d) KI has high M.Pt.
Answer
Answer: (a) Lattice energy of CaO is much higher than that of KI
Question 18.
The compounds of alkaline earth metals have the following magnetic nature.
(a) Diamagnetic
(b) Paramagnetic
(c) Ferromagnetic
(d) Antiferromagnetic
Answer
Answer: (a) Diamagnetic
Question 19.
Gypsum on heating to 390 K gives
(a) CaSO2.2H2O
(b) CaSO4
(c) CaSO4.\(\frac {1}{2}\)H2O
(d) SO3 and CaO
Answer
Answer: (c) CaSO4.\(\frac {1}{2}\)H2O
Question 20.
Which of the following is not present in cement?
(a) Gypsum
(b) Clay
(c) Alumina
(d) Alum
Answer
Answer: (d) Alum
Question 21.
In which of the following the hydration energy is higher than the lattice energy?
(a) SrSO4
(b) BaSO4
(c) MgSO4
(d) RaSO4
Answer
Answer: (c) MgSO4
Question 22.
When CaC2 is heated in atmospheric nitrogen in an electric furnace, the compound formed is
(a) Ca(CN)2
(b) Ca3N2
(c) CaNC2
(d) CaNCN
Answer
Answer: (d) CaNCN
Question 23.
Among the following compounds of cement which is present in the highest amount?
(a) Ca2SiO4
(b) Ca3SiO5
(c) Al2O3
(d) Ca3Al2O6
Answer
Answer: (b) Ca3SiO5
Fill in the blanks
Question 1.
The Phenomenon of crumbling to powder of sodium carbonate crystals on exposure to air is called as ……………….
Answer
Answer: Efflorescence
Question 2.
Plaster of Paris is obtained by heating ………………. at ……………….
Answer
Answer: gypsum, 120°C
Question 3.
Calcium salts impart ………………. colour to the flame.
Answer
Answer: Brick red
Question 4.
Sodium metal when dissolve in liquid NH3 gives a ………………. solution.
Answer
Answer: deep blue
Question 5.
Beryllium is diagonically related to ……………….
Answer
Answer: Aluminium
Question 6.
Potassium carbonate cannot be prepared by Solvay process because ……………….
Answer
Answer: KHSO3 is very soluble in water
Question 7.
When MgCl2.6H2O is heated, ………………. is formed.
Answer
Answer: Mg(OH)Cl
Question 8.
Burning of sodium reduces CO2 to ………………. & itself is oxidised to ……………….
Answer
Answer: Carbon, Na2CO3
Question 9.
Ca2+ has a smaller ionic radius than K+ because it has ……………….
Answer
Answer: Higher effective nuclear charge
Question 10.
Alkali & alkaline earth metals can only be prepared by the electrolysis of their ………………. chlorides.
Answer
Answer: Molten
Write True / False
Question 1.
Gypsum is added during the preparation of cement to slow down the process of setting.
Answer
Answer: False
Question 2.
Plaster of paris is CaSO4. \(\frac {1}{2}\) H2O.
Answer
Answer: True
Question 3.
BeSO4 is soluble & BaSO4 is insoluble in water.
Answer
Answer: True
Question 4.
BeCO3 is more thermally stable than BaCO3.
Answer
Answer: False
Question 5.
Alkali metals form covalent hydrides.
Answer
Answer: False
Question 6.
Polarizing power of Li+ is nearly the same as that of Mg2+ ion.
Answer
Answer: True
Question 7.
All alkaline earth metals can be tested by flame test.
Answer
Answer: False
Question 8.
Sodium when burnt in excess of oxygen gives sodium oxide.
Answer
Answer: False
Question 9.
Potassium burns in air to form superoxide KO2.
Answer
Answer: True
Question 10.
MgCl2.6H2O on heating gives anhydrous MgCl2.
Answer
Answer: False
Match the Following
| Column I | Column II |
| 1. Lime stone | (a) MgSO4.7H2O |
| 2. Slaked lime | (b) CaO |
| 3. Quicklime | (c) CaCO3 |
| 4. Epsom salt | (d) Ca(OH)2 |
| 5. Caustic soda | (e) NaHCO3 |
| 6. Baking soda | (f) NaOH |
| 7. Soda Ash | (g) Na2CO3 |
| 8. Alkaline earth metals | (h) Na2CO3 |
| 9. Solvey process is used for the manufacture of | (i) CaSO4. \(\frac {1}{2}\)H2O |
| 10. Plaster of paris | (j) Strong reducing agents |
Answer
Answer:
| Column I | Column II |
| 1. Lime stone | (c) CaCO3 |
| 2. Slaked lime | (d) Ca(OH)2 |
| 3. Quicklime | (b) CaO |
| 4. Epsom salt | (a) MgSO4.7H2O |
| 5. Caustic soda | (f) NaOH |
| 6. Baking soda | (e) NaHCO3 |
| 7. Soda Ash | (h) Na2CO3 |
| 8. Alkaline earth metals | (j) Strong reducing agents |
| 9. Solvey process is used for the manufacture of | (g) Na2CO3 |
| 10. Plaster of paris | (i) CaSO4. \(\frac {1}{2}\)H2O |
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