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Purification and Organic Compounds Test - 3

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Purification and Organic Compounds Test - 3
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Weekly Quiz Competition
  • Question 1
    4 / -1

    In a solution containing 2 Cu2+ and Cd2+, dil. H2SO4 is added followed by iron filings. The solution is warmed and NH4OH is added to reduce the acidity followed by passing of H2S gas. The ppt. obtained will be

    Solution

    Cu+2 ion from solution is removed completely by precipitation with iron filing because iron is more electropositive than copper (Cu+2 + Fe → Fe+2 + Cu). On passing H2S, a yellow ppt. of CdS is obtained. Thus the precipitate contain both Cu metal and CdS.

     

  • Question 2
    4 / -1

    An aqueous solution of a substance gives a white precipitate on treatment with dilute hydrochloric acid, which dissolves on heating. When hydrogen sulphide is passed through the hot acidic solution, a black precipitate is obtained. The substance is a

    Solution

     

  • Question 3
    4 / -1

    When borax is heated in a Platinum loop, the transparent bead formed contains:

    Solution

     

  • Question 4
    4 / -1

    A glassy bead formed by heating borax on a platinum wire loop is

    Solution

     

  • Question 5
    4 / -1

    Which of the following element forms dark green coloured salts?

    Solution

    Trivalent chromium salts in general have dark green colour.

     

  • Question 6
    4 / -1

    In the second group of qualitative analysis, H2S is passed through a solution acidified with dil. HCl in order to

    Solution

    HCl suppresses the ionization of H2S and thus, limits the concentration of S2– ions.

     

  • Question 7
    4 / -1

    In the following sequence of reaction, identify the compound (C).

  • Question 8
    4 / -1

    Ammonium salt gives brown colour with alkaline solution of Nessler’s reagent to form iodide of Millon’s base. The formula of this compound is

    Solution

    NH3 + 3NaOH + 2K2HgI4→ H2N–Hg–O–HgI + 4KI + 2H2O + 3NaI

     

  • Question 9
    4 / -1

    A coloured ppt. is obtained when H2S gas is passed through an aqueous solution of salt in presence of ammonium hydroxide. The ppt. dissolves in dil. HCl and reacts with NaOH to give white ppt. which on standing turns into brown/black mass. The brown/black mass on fusion with KNO3 and Na2CO3 gives green mass. The cation of the salt is

    Solution

     

  • Question 10
    4 / -1

    The compound (X) on heating gives a colourless gas. The residue is dissolved in water to obtain (Y). Excess CO2 is bubbled through aqueous solution of (Y), (Z) is formed. (Z) on gentle heating gives back (X). The compound (X) is:

    Solution

    It is a reason for the given fact.

     

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