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  • Question 1
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    Name a process by which an impure sample of naphthalene can be purified.

  • Question 2
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    A liquid is kept in an open china dish A.
    The evaporation of the liquid can be accelerated

  • Question 3
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    Which of the following energy is absorbed during change of state of a substance?

  • Question 4
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    Diethyl ether evaporates faster than ethyl alcohol because of which factor?

  • Question 5
    1 / -0

    Equal volume of ethanol is kept separately in a test tube, in a china dish, in a water glass and in a conical flask.
    In which container alcohol evaporates faster?

  • Question 6
    1 / -0

    When acetone or nail polish remover is applied cooling is experienced due to which factor?

  • Question 7
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    Match the following with the correct response:- 

     (1) Fusion  (A) Change of liquid state into gaseous state
     (2) Vaporisation   (B) Change of liquid state into solid state
     (3) Condensation  (C) Change of vapour state into liquid state
     (4) Solidification  (D) Change of solid state into liquid state

  • Question 8
    1 / -0

    Match the following with the correct response:-

     (1) Sublimation  (A) Heat required to change the state of 1Kg of solid into liquid
     (2) Evaporation  (B) Change of liquid state into vapours without coming to its boiling point
     (3) Latent heat of vaporisation  (C) Change of solid directly into vapours
     (4) Latent heat of fusion  (D) Heat required to change the state of 1Kg liquid into vapours

  • Question 9
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    Match the following with the correct response:-

     (1) Intermixing of substance on their own  (A) Diffusion
     (2) Temperature at which liquid changes into vapour  (B) Melting point
     (3) Temperature at which solid changes into liquid  (C) Boiling point
     (4) Energy possessed by the particles of the matter  (D) Kinetic energy

  • Question 10
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    Match the following with correct response.
    (1) Boiling point of water
    (2) Melting point of water
    (3) Boling point of Acetone
    (4) Melting point of Aluminium

    (A) 660∘c
    (B) 273K
    (C) 373K
    (D) 56∘c

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