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Chemistry Test 162
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Chemistry Test 162
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  • Question 1/10
    4 / -1

    The favourable conditions for a spontaneous reaction are

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  • Question 2/10
    4 / -1

    For the following reaction in gaseous phase

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  • Question 3/10
    4 / -1

    Amongst the following, identify the species with an atom in + 6 oxidation state:

    Solutions

    If an electronegative element is in its lowest possible oxidation state in a compound or in free state. It can function as a powerful reducing agent.

    e.g. I–

  • Question 4/10
    4 / -1

    Which of the following is not a use of dihydrogen?

    Solutions

    Hydrogen is not used in the synthesis of hydroquinone and tartaric acid.

     

  • Question 5/10
    4 / -1

    All of the following substances react with water. The pair that gives the same gaseous product is

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  • Question 6/10
    4 / -1

    Soldiers of Napolean army while at alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to

    Solutions

    (most common and stable) (Rhombic) Although transitions of white to grey tin occurs at any temperature below 15.2°C, it becomes rapid only at –50°C, unless a catalyst is present. During the conversion of white tin to grey tin (in cold countries) volume increases. Grey Sn is very brittle easily crumbles down to powder. This phenomenon is called tin diseases, tin past or tin plague.

     

  • Question 7/10
    4 / -1

    In Duma's method for estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K temperature and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is:

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  • Question 8/10
    4 / -1

    Acid catalyzed hydration of alkenes except ethene leads to the formation of

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  • Question 9/10
    4 / -1

    B.O.D. test or biochemical oxygen demand test is made for measuring

    Solutions

    Strength of sewage or degree of water pollution is measured in terms of BOD (Biochemical oxygen demand) value.

     

  • Question 10/10
    4 / -1

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