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Analytical Chemistry Test - 6

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Analytical Chemistry Test - 6
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Weekly Quiz Competition
  • Question 1
    4 / -1

    Which of the following mixture is chromic acid?

    Solution

    (Conc.H2SO4 + K2Cr2O7) mixture is called as chromic acid.

     

  • Question 2
    4 / -1

    In the precipitation of the iron group in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to:

    Solution

    As NH4Cl is a strong electrolyte. It supresses the ionization of NH4OH, so the concentration of OH− ions in the solution is decreased, but it is sufficient to precipitate the III group basic radicals because the solubility product of III group hydroxides is lower than IV, V and VI group hydroxides. As

     

  • Question 3
    4 / -1

    A 0.3 M HCl solution contains the following ions Hg++ , Cd++, Sr++, Fe++, Cu++ The addition of H2S to above solution will precipitate:

    Solution

    The second group radicals will precipitate because their solubility product is very low so sulphates will be precipitated.

     

  • Question 4
    4 / -1

    In the group III radicals, in place of NH4Cl which of the following can be used:

    Solution

    White precipitate obtained is of BaCl2, as the Cl− ion’s concentration increases due to the addition of HCl, the ionic product becomes more than solubility product and thus, BaCl2 is precipitated

     

  • Question 5
    4 / -1

    In qualitative analysis, in order to detect second group basic radical, H2S gas is passed in the presence of dilute HCl to:

    Solution

    HCl suppresses ionisation of weakly dissociated H2S, with the result only the ionic product of the sulphides of group II radicals exceed their corresponding solubility product and hence only these are precipitated.

     

  • Question 6
    4 / -1

    What weight of sodium hydroxide is required to neutralise 100 ml of 0.1 N–HCl?

    Solution

     

  • Question 7
    4 / -1

    Phenolphthalein is not a good indicator for titrating?

    Solution

    Phenolphthalein is an indicator for strong base and weak acid, but KMnO4 oxidises it.

     

  • Question 8
    4 / -1

    Yellow ammonium sulphide solution is a suitable reagent for the separation of:

    Solution

    Cd2+ belongs to II A group while As3+ to IIB. All the sulphides of IIB are soluble in yellow ammonium sulphide but those of IIA are insoluble.

     

  • Question 9
    4 / -1

    If 20 ml of 0.25 N strong acid and 30 ml of 0.2 N of strong base are mixed, then the resulting solution is:

    Solution

     

  • Question 10
    4 / -1

    8 ml of N/10 HCl 10 are required to neutralize 20 ml solution of Na2CO3 in water. Normality of Na2CO3 solution is:

    Solution

    N1V1 = N2V2

     

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