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Chemical Reactions and Equations Test - 10

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Chemical Reactions and Equations Test - 10
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Weekly Quiz Competition
  • Question 1
    1 / -0

    H2S burns in air to give

    Solution

    H2S combines with O2 to give water and SO2

  • Question 2
    1 / -0

    ZnO + C → Zn + CO is an example of

    Solution

    ZnO gets reduced to Zn and C gets oxidized to CO 

  • Question 3
    1 / -0

    Find the incorrect statement :
    (I) oxygen is highly combustible and hydrogen is supporter of combustion,
    (II) Oxygen and hydrogen both are highly combustible,
    (III) Oxygen and hydrogen both are supporters of combustion,
    (IV) Hydrogen is highly combustible and oxygen is supporter of combustion

    Solution

    Only Hydrogen is combustible and Oxygen is a supporter of combustion 

  • Question 4
    1 / -0

    Which of the following forms a coloured solution in water ?

    Solution

    When CuSO4 is dissolved in water the solution becomes much warmer than the water was before the CuSO4 was added. The equation for this process is:
    CuSO4 (s) + H2O (l) → CuSO4 (aq).
    The reaction between anhydrous copper(II) sulfate and water is used as a test for water. The white solid turns blue in the presence of water.

  • Question 5
    1 / -0

    Which one of Fe, Al, Cu, Zn is the least reactive metal?

    Solution

    Since Cu is much below all other elements in the reactivity series 

  • Question 6
    1 / -0

    The volume of gas collected in one of the test tubes in electrolysis of water is double than other name the gas

    Solution

    Because formula of water is H2O 

    in which ratio of H to O is 2:1 

  • Question 7
    1 / -0

    Milk becomes sour if kept for a long time because of

    Solution

    If milk kept in unpasteurized state the hydrolytic cleavage of fatty acids in milk by enzymes like lipase releases free acids which creates rancidity

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