Please wait...

Chemistry Test 78
Menu grid icon
Result Result point icon
Chemistry Test 78
  • Goals icon

    /

    Score
  • Trophy icon

    -

    Rank
White alarm icon Time Taken: -
Result frame illustration
  • Question 1/8
    4 / -1

    Which pair has same bond order :

  • Question 2/8
    4 / -1

    Body centred cubic and face centred cubic unit cells have n1 and n2 effective number of atoms. Which one of the following [n1, n2] combination is correct:

    Solutions

    For bcc n1 = 2 and for fcc n2 = 4
    ∴ (n1, n2) or (2, 4)

     

  • Question 3/8
    4 / -1

    The limiting radius ratio for tetrahedral void is :-

    Solutions

    Fact

     

  • Question 4/8
    4 / -1

    INCORRECT statement regarding solid material

  • Question 5/8
    4 / -1

    Platinum crystallizes in a face-centered cubic crystal with a unit cell edge length  'a'. The distance between nearest neighbour atom is :

    Solutions

    Distance between nearest neighbours is along the face diagonal =  a √2/2.

     

     

  • Question 6/8
    4 / -1

    The bromination of acetone that occurs in acid solution is represented by

    CH3COCH3(aq.) + Br2(aq.) → CH3COCH2Br(aq.) + H+(aq.) + Br– (aq.)

    These kinetic data were obtained for given reaction concentration

    Initial concentration Initial rate of disappearance of Br2
    [CH3COCH3] [Br2] [H+]
    0.30 0.05 0.05 5.0 × 10–5
    0.30 0.10 0.05 5.0 × 10–5
    0.30 0.10 0.10 1.0 × 10–4
    0.90 0.05 0.10 3.0 × 10–4

    Based on these data, rate equation is -

    Solutions

    From (1) and (2),

    [CH3COCH3] and [H+] = constant

    [Br2] = doubled

    Rate = unchanged

    ∴ Order w.r.t. Br2= 0

    Possible rate law (By option)

    r = k [CH3COCH3] [H+]

     

  • Question 7/8
    4 / -1

    For a reaction Ea = 0 and k = 3.2 × 108s–1 at 300K. The value of frequency factor at 400 K would be :-

    Solutions

    K = A × e–Ea/RT

    if Ea = 0, K = A (independent of T)

    ∴ A = 3.2 × 108

     

  • Question 8/8
    4 / -1

    A substance (initial concentration = a) reacts according to zero order kinetics. The time taken for the completion of reaction is nearly :-

    Solutions

    tcompletion = 2 × t1/2

    (∵ Rate is constt. in zero order)

    tcompletion = 2 × a/2k = a/k

     

Close button icon
User Profile
-

Correct (-)

Wrong (-)

Skipped (-)

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
Mockers logo Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Arrow pointer icon
Click on Allow to receive notifications
Notification bell icon ×
Open Now