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Chemistry Test 143
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Chemistry Test 143

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  • Question 1/10
    4 / -1

    If helium and methane are allowed to diffuse out of the container under the similar conditions of temperature and pressure, then the ratio of rate of diffusion of helium to methane is .

    Solutions

     

  • Question 2/10
    4 / -1

    For a monatomic gas kinetic energy = E, the relation with rms velocity is

    Solutions

    For a monatomic gas with only Translational degrees of freedom
    E⁡a = 3/2 k⁡bT⁡ (Avg K E per molecule)

     

  • Question 3/10
    4 / -1

    In this balanced equartion x, y, z are

    Solutions

    So x = 1
    y = 3
    z = 6

     

  • Question 4/10
    4 / -1

    Propyne and propene can be distinguished by

    Solutions

    The terminal hydrogen is acidic in 
    H3C - C ≡ CH
    (propyne) and it reacts with ammoniacal AgNO3. In propene, CH3CH = CH2 there is no acidic hydrogen.

     

  • Question 5/10
    4 / -1

    A piston is cleverly designed so that it extracts the maximum amount of work out of a chemical reaction, by matching Pexternal to the Pinternal at all times. This 8cm diameter piston initially holds back 1 mol of gas occupying 1 L, and comes to rest after being pushed out a further 2 L at 25oC .After exactly half of the work has been done, the piston has travelled out a total of

    Solutions

     

  • Question 6/10
    4 / -1

    A monatomic ideal gas undergoes a process in which the ratio of P to V at any instant is constant and equal to 1. What is the molar heat capacity of the gas?

    Solutions

     

  • Question 7/10
    4 / -1

    Which of the following carboxylic acids undergoes decarboxylation easily ?

    Solutions

     

  • Question 8/10
    4 / -1

    The most stable resonating structure of following compound is

    Solutions

    Complete octet & Extended conjugation

     

  • Question 9/10
    4 / -1

    Heating mixture of Cu2O and Cu2S will give

    Solutions

    Cu2S + 2Cu2O ⟶ 6Cu + SO2

    This is an example of auto - reduction.

     

  • Question 10/10
    4 / -1

    A solution which is 10–3 M each in Mn2 +, Fe2 +, Zn2 + and Hg2 + is treated with 10-16 M sulphide ion. If Ksp of MnS, FeS, ZnS and HgS are 10-13, 10–18, 10–24 and 10–53 respectively, which one will precipitate first ?

    Solutions

    [S2-] need for precipitation of

    Thus minimum [S2-] for precipitation is for HgS it will be precipitated first

     

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