CBSE  /  Class 11  /  Chemistry  /  The s-Block Elements

  • 1. 
    CsOH is

  • Strongly basic
  • Weakly basic
  • Slightly acidic
  • Amphoteric.

  • 2. 
    Alkali metals give a _________________when dissolved in liquid ammonia

  • Deep blue solution
  • Colourless
  • Red colour
  • None of the Above

  • 3. 
    What are Oxo-Acids?

  • Acid containing Oxygen
  • Acid containing Sulphur
  • Acid containing Carbon
  • None of the Above

  • 4. 
    In curing cement plasters, water is sprinkled from time to time. This helps in

  • Converting sand into silicic acid
  • Keeping it cool
  • Developing interlocking needle like crystals of hydrated silicates
  • Hydrating sand and gravel mixed with cement.

  • 5. 
    The substance not likely to contain CaCO

  • Dolomite
  • A marble statue
  • Calcined gypsum
  • Sea shells.

  • 6. 
    Carnallite is the mineral of:

  • Na
  • Ca
  • Mg
  • None of the Above

  • 7. 
    The wire of flash bulb is made up of:

  • Mg
  • Ag
  • Cu
  • Ba

  • 8. 
    The basic strength of which hydroxide is maximum

  • LiOH
  • NaOH
  • Ca (OH)
  • KOH.

  • 9. 
    Which of the following alkali metals has the least melting point?

  • Na
  • K
  • Rb
  • Cs.

  • 10. 
    The basic strength of which hydroxide is maximum

  • LiOH
  • NaOH
  • Ca(OH)
  • KOH.
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