S Block Elements MCQ for Class 11 Chemistry Chapter 10

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

View Answer

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

View Answer

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

View Answer

Answer:Fe

4 CsOH is

A Strongly basic

B Weakly basic

C Slightly acidic

D Amphoteric.

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer:Ca(OCI)₂

8 The hydration energy of Mg²⁺ is larger than that of

A A1³⁺

B Na⁺

C Be²⁶

D Mg³⁺

View Answer

Answer:Na⁺

9 The basic strength of which hydroxide is maximum

A LiOH

B NaOH

C Ca(OH)₂

D KOH.

View Answer

Answer:KOH.

10 Which of the following alkali metals has the least melting point?

A Na

B K

C Rb

D Cs.

View Answer

Answer:Cs.

11 The composition of Sorels cement is

A KCl × MgCl₂× 6H₂O

B MgCl₂ × 5MgO × (xH₂O)

C MgCO₃ × CaCO₃

D CaSO₄ × 2H₂O

View Answer

Answer:MgCl₂ × 5MgO × (xH₂O)

12 The basic strength of which hydroxide is maximum

A LiOH

B NaOH

C Ca (OH)2

D KOH.

View Answer

Answer:KOH.

13 The wire of flash bulb is made up of:

A Mg

B Ag

C Cu

D Ba

View Answer

Answer:Mg

14 Carnallite is the mineral of:

A Na

B Ca

C Mg

D None of the Above

View Answer

Answer:Mg

15 The substance not likely to contain CaCO₃ is

A Dolomite

B A marble statue

C Calcined gypsum

D Sea shells.

View Answer

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.

View Answer

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

View Answer

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

View Answer

Answer: Deep blue solution

19 Solvays process is used for the manufacture of :

A NaOH

B (Na₂CO₃. 10H₂O)

C K₂CO₃

D Na₂O₂

View Answer

Answer:(Na₂CO₃. 10H₂O)

20 CsOH is

A Strongly basic

B Weakly basic

C Slightly acidic

D Amphoteric.

View Answer

Answer:Strongly basic

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