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Chemistry Test 219

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Chemistry Test 219
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Weekly Quiz Competition
  • Question 1
    4 / -1

    Which is the best description of the behaviour of bromine in the reaction: H₂O + Br₂ → HOBr + HBr?

    Solution

     

  • Question 2
    4 / -1

    Identify the indicator used to titrate Na₂CO₃ solution with HCl

    Solution

    I would pick either phenophthalein or methyl-orange. Phenophthalein will change for the first protonation:

    Na2CO3 + HCl = NaHCO3 + NaCl

    Methyl-orange will change for the second protonation:

    NaHCO3 + HCl = H2CO3 + NaCl

    H2CO3 = H2O + CO2

    Either titration will tell you the amount of Na2CO3 you have.

    Combining both indicators is possible but since Methyl-orange is yellow on the basic side, it may obscure the transition of the phenophthalein (purple to colorless). If you were to use both, it would be best to add the methyl orange indicator after the first equivalence point when the phenophthalein has gone colorless. You would also have to remember to divide the concentration you get using two equivalents of acid by 2 to get the concentration of Na2CO3.

     

  • Question 3
    4 / -1

    It is found that 0.1 m solution of four sodium salts NaA,NaB and NaD have the following pH values :

    Which one of the corresponding acids is strongest ?

    Solution

    Salts of strong acids and strong base have pH = 7

     

  • Question 4
    4 / -1

    Which one of the following salt's aqueous solution is likely to have pH < 7 ?

    Solution

    Bcause NH4Cl is formed by strong acid HCl and weak base NH4OH

     

  • Question 5
    4 / -1

    The pH value of a 10 M solution of HCI is

    Solution

    Ph = -log[H⁺] = -log10

    ph= -1

    which is less than 0

     

  • Question 6
    4 / -1

    Which of the following reagents is useful in separating benzoic acid from phenol?

    Solution

    Benzoic acid dissolves in a aqueous solution of NaHCO3, while phenol being less acidic than H2CO3 do not react.

     

  • Question 7
    4 / -1

    The catalyst used for the polymerization of olefins is

    Solution

    A Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, is a catalyst used in the synthesis of polymers of 1-alkenes (alpha-olefins).

     

  • Question 8
    4 / -1

    The reaction/method that does not give an alkane is

    Solution

    Dehydrohalogenation of alkyl halide gives alkenes but not alkane

     

  • Question 9
    4 / -1

    Example of unit cell with crystallographic dimensions a≠b≠c,α=γ=90º,β≠90º is

    Solution

     

     

  • Question 10
    4 / -1

    Xenon crystallises in the face-centered cubic lattice and the edge length of the unit cell is 620 pm. The distance between two neighbour atoms is

    Solution

     

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