Carbon and its Compounds Book Back Questions

9th Standard

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Science

Time : 00:45:00 Hrs
Total Marks : 35
    6 x 1 = 6
  1. A phenomenon in which an element exists in different modification in same physical state is called

    (a)

    Isomerism

    (b)

    Allotropy

    (c)

    Catenation

    (d)

    Crystallinity

  2. The carbon atoms in fullerene are arranged in mixed

    (a)

    Tetragon and Pentagon

    (b)

    Pentagon and Hexagon

    (c)

    Hexagon and Heptagon

    (d)

    Heptagon and Octagon

  3. Raagav brings his lunch every day to school in a plastic container which has resin code number 5. The container is made of

    (a)

    Polystyrene

    (b)

    PVC

    (c)

    Polypropylene

    (d)

    LDPE

  4. Which of the following plastic items are banned by the Government of Tamil Nadu as of 1st January 2019?

    (a)

    Plastic sheets

    (b)

    Plastic tea cups

    (c)

    Plastic water packets

    (d)

    All the above

  5. Graphite is used as lubricant in machines because

    (a)

    it is good conductor of electricity

    (b)

    it is made of slippery layers and has high melting point

    (c)

    it has high density

    (d)

    it is strong and soft

  6. Plastic resin codes are shown as three chasing arrows in a ______________ with a number in the middle or letters (an acronym of that plastic type).

    (a)

    Logo

    (b)

    Recycling symbol

    (c)

    Square

    (d)

    Triangle

  7. 3 x 1 = 3
  8. _____________ named carbon.

    ()

    Antoine Lavgisier

  9. Compounds with same molecular formula and different structural formula are knows as ____________.

    ()

    Isomers

  10. There are ____________ plastic resin codes

    ()

    7

  11. 5 x 1 = 5
  12. Alkyne

  13. (1)

    Bucky Ball

  14. Andre Geim

  15. (2)

    Polystyrene

  16. C60

  17. (3)

    Oxidation

  18. Thermocol

  19. (4)

    Graphene

  20. Burning

  21. (5)

    Triple bond

    3 x 2 = 6
  22. It is the hardest allotrope of carbon. mnodaid

  23. Plastics made of ___________ are represented by resin code # 6. sytlopynere

  24. Expanded polystyrene is commercially known as mthreolco

  25. 1 x 2 = 2
  26. Who is called 'Father of Modern Organic Chemistry'?

  27. 1 x 3 = 3
  28. Carbon do not form ionic compounds. Why?

  29. 2 x 5 = 10
  30. Name the three safer resin codes of plastics and describe their features.

  31. When a carbon fuel burns in less aerated room, it is dangerous to stay there. Why?

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