10 - Science - 12. Chemistry – Periodic Classfication Of Elements

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10 - Science - 12. Chemistry  Periodic Classfication Of Elements

Prepared By Mr. S. Ravikumar, B. T. Asst. , GHS, Arangaldhurgam, Vellore District.   ; &nbs p; & www. Padasalai. Net


Questions and Answers
  • 1. 
    In the modern periodic table periods and groups are given. Periods and groups indicate ––––––
    • A. 

      Rows and Columns

    • B. 

      Columns and rows

  • 2. 
    Third period contains 8 elements, out of these elements how many elements are non-metals?
    • A. 

      4

    • B. 

      5

    • C. 

      6

    • D. 

      7

  • 3. 
    An element which is an essential constituent of all organic compounds belongs to _________ group.
    • A. 

      14 th group

    • B. 

      15 th group

  • 4. 
    Ore is used for the extraction of metals profitably. Bauxite is used to extract aluminium, it can be termed as ________
    • A. 

      Ore

    • B. 

      Mineral

  • 5. 
    Gold does not occur in the combined form. It  does not react with air (or) water. It is in ______
    • A. 

      Native state

    • B. 

      Combined state

  • 6. 
    • A. 

      Assertion and reason are correct and relevant to each other

    • B. 

      Assertion is true but reason is not relevant to the assertion

  • 7. 
    A process employed for the concentration of sulphide ore is __________
    • A. 

      Froth floatation

    • B. 

      Gravity separation

  • 8. 
    Coating the surface of iron with other metal prevents it from rusting. If it is coated with thin layer of zinc it is called _________
    • A. 

      Galvanization

    • B. 

      Painting

    • C. 

      Cathodic protection

  • 9. 
    Any metal mixed with mercury is called amalgam. The amalgam used for dental filling is _________
    • A. 

      Ag – Sn amalgam

    • B. 

      Cu – Sn amalgam

  • 10. 
    Assertion: In thermite welding, aluminium powder and Fe2O3 are fused. Reason: Aluminium powder is a strong reducing agent. Does the reason satisfy the assertion?
    • A. 

      No

    • B. 

      Yes