S Block Elements MCQ for Class 11 Chemistry Chapter 10

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Questions
1 Usually CaCl2 is preferred over NaCl for cleaning snow on roads particularly in very cold countries this is because
A NaCl makes the road slippery but CaCl2 doesnot
B CaCl2 is hygroscopic but NaCl is not
C CaCl2 is less soluble in H2O than NaCl
D eutectic mixtue of CaCl/H2O freezes at -55°C while that of NaCl/H2O freezes at -18°C

Answer:eutectic mixtue of CaCl/H2O freezes at -55°C while that of NaCl/H2O freezes at -18°C
2 The wire of flash bulb is made up of:
A Mg
B Ag
C Cu
D Ba

Answer:Mg
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3 Which of the following metals is not manufactured by electrolysis?
A Na
B Mg
C Al
D Fe

Answer:Fe
4 CsOH is
A Strongly basic
B Weakly basic
C Slightly acidic
D Amphoteric.

Answer:Strongly basic
5 The salt that is added to table salt to make it flow freely in rainy season is
A KCl
B KI
C Ca3(PO4)2
D Na3PO4

Answer:Ca3(PO4)2
6 What happens when Calcium carbonate is heated to 1200 K?
A Carbon Monoxide
B Calcium hydroxide
C Calcium Oxide
D Both (2) and (3) are correct

Answer:Both (2) and (3) are correct
7 Milk of lime reacts with chlorine to form ________, a constituent of bleaching powder.
A Ca(OCI)2
B Ca(CIO2)2
C Ca(CIO3)2
D Ca(CIO4)2

Answer:Ca(OCI)2
8 The hydration energy of Mg2+ is larger than that of
A A13+
B Na+
C Be26
D Mg3+

Answer:Na+
9 The basic strength of which hydroxide is maximum
A LiOH
B NaOH
C Ca(OH)2
D KOH.

Answer:KOH.
10 Which of the following alkali metals has the least melting point?
A Na
B K
C Rb
D Cs.

Answer:Cs.
11 The composition of Sorels cement is
A KCl × MgCl2× 6H2O
B MgCl2 × 5MgO × (xH2O)
C MgCO3 × CaCO3
D CaSO4 × 2H2O

Answer:MgCl2 × 5MgO × (xH2O)
12 The basic strength of which hydroxide is maximum
A LiOH
B NaOH
C Ca (OH)2
D KOH.

Answer:KOH.
13 The wire of flash bulb is made up of:
A Mg
B Ag
C Cu
D Ba

Answer:Mg
14 Carnallite is the mineral of:
A Na
B Ca
C Mg
D None of the Above

Answer:Mg
15 The substance not likely to contain CaCO3 is
A Dolomite
B A marble statue
C Calcined gypsum
D Sea shells.

Answer:Calcined gypsum
16 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 needle like crystals of hydrated silicates
D Hydrating sand and gravel mixed with cement.

Answer:Developing interlocking needle like crystals of hydrated silicates
17 What are Oxo-Acids?
A Acid containing Oxygen
B Acid containing Sulphur
C Acid containing Carbon
D None of the Above

Answer:Acid containing Oxygen
18 Alkali metals give a _________________when dissolved in liquid ammonia
A Deep blue solution
B Colourless
C Red colour
D None of the Above

Answer: Deep blue solution
19 Solvays process is used for the manufacture of :
A NaOH
B (Na2CO3. 10H2O)
C K2CO3
D Na2O2

Answer:(Na2CO3. 10H2O)
20 CsOH is
A Strongly basic
B Weakly basic
C Slightly acidic
D Amphoteric.

Answer:Strongly basic

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