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Chemistry Test 11
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Chemistry Test 11

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  • Question 1/10
    4 / -1

    In the extraction process of aluminium from bauxite ore, aluminium hydroxide is precipitated from the strongly alkaline aluminate solution, by bubbling in some CO2. The function of CO2 is

    Solutions

     

  • Question 2/10
    4 / -1

    An alkane has a C/H-ratio (by mass) of 5.1428. Its molecular formula is

    Solutions

     

  • Question 3/10
    4 / -1

    The decomposition of H2O2 can be slowed down by the addition of small amount of phosphoric acid which act as

    Solutions

    Inhibitors are also known as negative catalyst.

  • Question 4/10
    4 / -1

    A weak acid HX (Ka = 10–5) reacts with caustic soda to form salt NaX (0.1 M), degree of dissociation of NaX will be (Kw = 10–14)

    Solutions

     

  • Question 5/10
    4 / -1

    Which of the following does not contribute towards the formation of photochemical smog ?

    Solutions

    Photochemical smog occurs in warm, dry and sunny climate and results from the action of sunlight on nitrogen oxides (NOx) and hydrocarbons produced by automobiles and factories. It is oxidizing in nature because of high concentration of oxidizing agents (NO2 and O3).

  • Question 6/10
    4 / -1

    Statement -1: AlCl3 forms dimer Al2Cl6 but it dissolves in water forming [Al(H2O)6]3+ and Cl– ions. 
    because 
    Statement -2: Aqueous solution of AlCl3 is acidic due to hydrolysis.

    Solutions

     

  • Question 7/10
    4 / -1

    For the complex ion [Cr(H2O)6]3+, the hybridization and magnetic nature are respectively.

    Solutions

  • Question 8/10
    4 / -1

    The correct order of acidic strength is

    Solutions

    Acidic character of oxides increases with the increase in the oxidation state of the central atom. hence the correct order is 

    Hence, option A is correct.

  • Question 9/10
    4 / -1

    Which of the following is an alkaloid

    Solutions

    All these are alkaloids

  • Question 10/10
    4 / -1

    One mole of magnesium in the vapour state absorbed 1200 kJ of energy. If the first and second ionization enthalpies of magnesium are 750 and 1450 kJ mol–1respectively, the final composition of the mixture is

    Solutions

     

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