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Separate the following into physical ...

Separate the following into physical and chemical changes :
Sublimation of a solid , decomposition of water into hydrogen and oxygen by passing electric current , sublimation of a solid , decomposition of water .

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Knowledge Check

  • The enthalpy of formation of water from hydrogen and oxygen is _286 kJ mol^-1 The enthalpy of decomposition of water into hydrogen and oxygen is

    A
    `- 286 " kJ mol"^-1`
    B
    `- 141 "kJ mol"^-1`
    C
    `+286 "kJ mol"^-1`
    D
    `+1 43 "kJ mol"^-1`

  • Which of the following chemical change is a photolytic decomposition reaction?

    A
    Decomposition of HOCl on standing.
    B
    Formation of hydrogen chloride from their constituent elements.
    C
    Decomposition of limestone .
    D
    Both 1 and 2.

  • Which of the following chemical change is a pho tolytic decomposition reaction?

    A
    Decomposition of HOCI on standing
    B
    Formation of hydrogen chloride from their constituent elements
    C
    Decomposition of limestone
    D
    Both 1 and 2

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