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Chemistry Test 12
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Chemistry Test 12

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  • Question 1/10
    4 / -0

    The frequency of one of the lines in Paschen series of a hydrogen atom is 2.34 × 1014Hz. The higher orbit, n2, which produces this transitions is-

    Solutions

     

  • Question 2/10
    4 / -0

    The rate constant (k) for the reaction 2A + B → Products, was found to be
    2.58 × 10–5l mol–1 s–1 after 15 sec,
    2.60 × 10–5l mol–1 s–1 after 30 sec and
    2.55 × 10–5l mol–1 s–1 after 50 sec. Hence the order of the reaction is –

    Solutions

    For nth order, unit of k = (mol L–1)1–n × s–1 
    For n = 2, unit of k = (mol L–1)1–2 × s–1 
    = mol–1 L s–1.

  • Question 3/10
    4 / -0

    Coordination compound have great importance in biological systems. In this context which of the following statements is incorrect?

    Solutions

    Chlorophyll contains magnesium instead of calcium

  • Question 4/10
    4 / -0

    Evaluate Δu at 500 K for the process 
    Mg (s) + 2HCl (g) = MgCl2 (s) + H2(g)
    ΔH = – 109 k cal. 
    The volume-change of solids to be ignored

    Solutions

  • Question 5/10
    4 / -0

    Solutions

    rf = rb

  • Question 6/10
    4 / -0

    2 litres of ammonia at 13 ºC and 0.9 atomspheric is neutralized by 134 ml of H2SO4 solution. Find the normality of the acid.

    Solutions

     

  • Question 7/10
    4 / -0

    Physical adsorption is accompanied by –

    Solutions

    Adsorption is thus accompanied by decrease in enthalpy as well as decrease in entropy of the system.

  • Question 8/10
    4 / -0

    Which of the following solutions will have the maximum lowering of vapour pressure at 300 K ?

    Solutions

    1M BaCl2 ionises to give three (3) ions as a result of which effective molality in solution increases by 3 times. Hence, it's freezing point is lowest.

  • Question 9/10
    4 / -0

    The species which can best serve as an initiator for the cationic polymerization is :

    Solutions

    Lewis acids can initiate the cationic polymerization. 
    Hence, option C is correct.

  • Question 10/10
    4 / -0

    Which one of the following does not show the Iodoform test ?

    Solutions

     

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