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Redox Reaction & Volumetric Analysis Test - 1

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Redox Reaction & Volumetric Analysis Test - 1
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  • Question 1
    1 / -0

    100 ml of 0.01 M KMnO4 oxidizes 10 ml of H2O2 sample in acidic medium. The volume strength of H2O2 sample is

    Solution

    IP acidic medium : H2O2  →  2H+ + O2+ 2e-

    Hence,5 × 0.01 × 100 = 2 × molarity ( H2O2 ) × 10

    ⇒ M = 0.25

    'Vol' strength of H2O2 = 11.2 × 0.25 = 2.80

    [ 1M = 11.2 'Vol' ]

     

  • Question 2
    1 / -0

    In which of the following oxidation state of phosphorus is + 3?

    Solution

    In phosphorus acid (H3PO3) oxidation state is + 3.

    In orthophosphoric acid (H3PO4), it is +5.

    In metaphosphoric acid (HPO3), it is + 5 and in pyrophosphoric acid (H2P2O7), it is + 5.

     

  • Question 3
    1 / -0

    Select the compound in which iron is in lowest oxidation state

    Solution

    In Fe (CO)5, iron is in zero oxidation state.

    In carbonyls metal is in zero oxidation state.

     

  • Question 4
    1 / -0

    Electrochemical equivalent of an element is 0.0003292. Its equivalent mass is

    Solution

    Equivalent mass = 0.0003292 × 96500= 31.78.

  • Question 5
    1 / -0

    A blue colored compound Na3MnO4.7H2O is obtained by the reaction of sodium permanganate with sodium formate in alkaline solution. Which of the following statements is incorrect?

    Solution

    Formate ion is oxidized so it is not correct.

  • Question 6
    1 / -0

    An acid-base indicator has pKa = 8.4. The indicator will not be suitable for which of the following titrations?

    Solution

    The indicator shows the color change on basic side. In titrations of NH3 with HCl and C6H5NH2 with HCl, the pH of resulting solution at the equivalence point lies on acidic side due to the hydrolysis of the salt of weak base with strong acid.

     

  • Question 7
    1 / -0

    The most stable oxidation state(s) of manganese in various media is/are

    Solution

    The most stable oxidation states of manganese in any media are +2 and +4.

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