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Chemistry Test 222
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Chemistry Test 222
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  • Question 1/10
    4 / -1

    Wilkinson catalyst is:

    Solutions

    Wilkinsion catalyst is [(ph3P)3RhCl]

     

  • Question 2/10
    4 / -1

    Which of the following conditions in drinking water causes methemoglobinemia ?

    Solutions

    The concentration of nitrate > 50 ppm in drinking water causes methemoglobinemia which is a blood disorder in which an abnormal amount of methemoglobin is produced.

     

  • Question 3/10
    4 / -1

    The major product of the following reaction is:

    Solutions

    During AES Br is o/p directing and major product will be formed on less hindrance p position.

     

  • Question 4/10
    4 / -1

    Correct statements among a to d regarding silicones are :

    (A) They are polymers with hydrophobic character

    (B) They are biocompatible.

    (C) In general, they have high thermal stability and low dielectric strength.

    (D) Usually, they are resistant to oxidation and are used as greases.

    Solutions

    Silicones are the polymer of silicon-containing [−(R)3Si−O−] linkage.

    It is a polymer with hydrophobic character thus used in making water-resistant seals.

    They are biocompatible.

    They are thermally stable compounds and their stability comes from the high amount of energy required to break the Si−O and Si−Alkyl bonds. They also have high dielectric constant and that is why they are good insulators. So, the given statement (c) is not correct.

    They are also resistant to oxidation. Because of wax-like texture, they are also used in greases.

    Hence, the correct option is (d).

     

  • Question 5/10
    4 / -1

    For emission line of atomic hydrogen from ni to nf = 8, the plot of wave number 

    (The Rydberg constant, RH is in wave number unit).

    Solutions

     

  • Question 6/10
    4 / -1

    Two pi and half sigma bonds are present in:

    Solutions

     

  • Question 7/10
    4 / -1

    Adsorption of a gas follows Freundlich adsorption isotherm. In the given plot, x is the mass of the gas adsorbed on mass m of the adsorbent at pressure p. x/m is proportional to

    Solutions

     

  • Question 8/10
    4 / -1

    The total number of isotopes of hydrogen and number of radioactive isotopes among them, respectively, are:

    Solutions

     

  • Question 9/10
    4 / -1

    0.5 moles of gas A and x moles of gas B exert a pressure of 200 Pa in a container of volume 10 m3 at 1000 K. given R is the gas constant in JK-1 mol-1 m, x is :

    Solutions

     

  • Question 10/10
    4 / -1

    In general, the properties that decrease and increase down a group in the periodic table, respectively, are:

    Solutions

    The value of effective nuclear charge decreases down the group.

    Hence, the electronegativity decreases and atomic radius increases on moving down the group.

     

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