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Chemistry Test - 56

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Chemistry Test - 56
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Weekly Quiz Competition
  • Question 1
    1 / -0

    In nuclear reactor,Chain reaction is controlled by introducing

    Solution

    In nuclear reactor,Chain reaction is controlled by introducing cadmium rod.

  • Question 2
    1 / -0

    When formaldehyde and potassium hydroxide are heated, we get

    Solution

    When formaldehyde and potassium hydroxide are heated , we get Methyl alcohol.

  • Question 3
    1 / -0

    Which one of the following elements is essential for construction is nuclear reactors

    Solution

    Zirconium elements is essential for construction is nuclear reactors.

  • Question 4
    1 / -0

    What is the oxidation number of sulfur in H2S?

    Solution

    The sum of the oxidation numbers in a compound must equal zero. In the compound hydrogen sulfide, H2S, the two hydrogen atoms have an oxidation number of +1, for a total of +2.

    Therefore, the oxidation number of sulfur in the compound is -2, and the sum of the oxidation numbers is 0.

  • Question 5
    1 / -0

    Mg+O2=MgO

    Balance the above Chemical equation?

    Solution

    Given Equation is

    Mg + O2 → MgO

    Balancing the Chemical Equation is nothing but Conservation of Matter. As Matter is Neither created nor Destroyed, it must be conserved.

    Here we have 1 Mg and 2 O on the left side and 1 Mg and 1 O on the right side

    To balance that, add 1 Mg on the left side so that it becomes 2 Mg and 2 O on the left side

    i.e,

    2 Mg + O2 → 2 MgO

    Here it has 2 Mg & 2 O on the left side and 2 Mg and 2 O on the right side and the Chemical equation is Balanced.

  • Question 6
    1 / -0

    Which compound matches the IR Spectrum?

    Solution

    1, 5 – hexadiene:

    The vinyl bending and other stretches were matched with the above structure.

  • Question 7
    1 / -0

    What is the structure of IF7 ?

    Solution

    In IF7 out of 7 Flourine atoms 5 of them are placed on a plane in Pentagon shape .In remaining 2 flourines one is placed above the plane and other below the plane each at 90 degrees.

  • Question 8
    1 / -0

    SI unit of equivalent conductance

    Solution

    Equivalent conductance is defined as the conductance of an electrolyte solution containing one gram equivalent of the electrolyte. It is equal to the product of specific conductance (k) of the solution and the volume (V) of the solution that contains one gram equivalent of the electrolyte.

    λ = k x V

    Unit of spceific conductance k is Siemens / m.

    Volume of the solution V is m3

    Now, required equivalent conductance unit is Siemens . m2/equivalent .

  • Question 9
    1 / -0

    A radioactive substance has a half life of four months, three-fourth of the substance would decay in

    Solution

    A radioactive substance has a half life of four months, three-fourth of the substance would decay in 8 months.

  • Question 10
    1 / -0

    Which one is the pure element

    Solution

    Sodiumis the pure element.

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