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Chemistry Test ...

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  • Question 1
    4 / -1

    When KMnOsolution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because:

  • Question 2
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    Photochemical smog can be suppressed by

  • Question 3
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  • Question 4
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    On adding a few drops of dilute HCl or Feclto a freshly precipitated ferric hydroxide, a red-coloured colloidal solution is obtained. This phenomenon is called:

  • Question 5
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    Alkali halids do not show Frenkel defect because:

  • Question 6
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    Two different first order reactions have rate constants k1 and k2 at T(k1 > k2) . If temperature is increased from T1 to T2 , then new constants become k3 and k4 respectively. Which among the following relations is correct?

  • Question 7
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    Which of the following elements does not belong to the Carbon family?

  • Question 8
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    Which of the following group’s elements have smaller atomic radii?

  • Question 9
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    The co-ordination number and oxidation state of Cr in K3 [Cr(C2O4)3] are respectively:

  • Question 10
    4 / -1

    The pKb value of ammonium hydroxide is 4.75. An aqueous solution of ammonium hydroxide is titrated with HCl. The pH of the solution at the point where half of the ammonium hydroxide has been neutralized will be:

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