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Chemistry Test 148

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Chemistry Test 148
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Weekly Quiz Competition
  • Question 1
    4 / -1

    The ratio of number of σ‑bond to π‑bond in N2 and CO molecules are

  • Question 2
    4 / -1

    The state of hybridisation of central atom in dimer form of both BH3 and BeH2 is

  • Question 3
    4 / -1

    For H3PO3 and H3PO4, the correct choice is

  • Question 4
    4 / -1

    In diamond, carbon atom occupy fcc lattice points as well as alternate tetrahedral voids. If edge length of the unit cell is 356 pm, then diameter of carbon atom is :-

    Solution

     

  • Question 5
    4 / -1

    A sample of an ideal gas is expanded 1 m3 to 3 m3  in a reversible process for which P = KV2, with K = 6 bar/m6. Work done by the gas is :-

    Solution

     

  • Question 6
    4 / -1

    Directions For Questions

    Fe2O3(s) may be converted to Fe by the reaction :-

    for which KC = 8 at temp. 720ºC

    ...view full instructions

    What percentage of the H2 remains unreacted after the reaction has come to equilibrium ?

    Solution

     

  • Question 7
    4 / -1

    Which of the following option show correct matches :-

      Column-I   Column-II
    (a) Precipitation of
    colloidal sol    		 (p) Peptization
    (b) Purification of
    colloid    		 (q) Coagulation
    (c) Gold Number (r) Desorption
    (d) Formation of
    colloidal sol    		 (s) Dialysis
        (t) Measure of
    protective power
    Solution

    Based on definitions.

     

  • Question 8
    4 / -1

    3 moles of FeSO4 are oxidised by "a" mole of K2Cr2O7 in acidic medium whereas 3 moles of FeC2O4 are oxidised by "b" mole of K2Cr2O7 in acidic medium, the ratio of "a" and "b" is :-

    Solution

    geq of FeSO4 = geq of K2Cr2O7

    ∵ mole × n factor = geq

    ∴ 3 × 1 = a × 6   ...(i)

    similarly geq of FeC2O4 = geq of K2Cr2O7

    3 × 3 = b × 6     ...(ii)

     

  • Question 9
    4 / -1

    The rate constant of a first order reaction is 3 × 10–6 per sec. If the initial concentration is 0.10 M, the initial rate of reaction is :-

    Solution

    K = 3 × 10–6 sec–1

    a0 = initial concentration = 0.10 M

    For first order reaction

    rate of reaction = K[A]

    = 3 × 10–6 × 0.1

    = 3 × 10–7 × Ms–1

     

  • Question 10
    4 / -1

    7.6gm KBr in 1250 ml solution was found to have an osmotic pressure of 1.804 atm at 27°C. Calculate degree of dissociation in % -

    (Atomic weight K = 39, Br = 80)

    Solution

     

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