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Chemistry Test 65
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Chemistry Test 65
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  • Question 1/8
    4 / -1

    The time for half-life period of a certain reaction A→ products is 1 hour. When the initial concentration of the reactant ‘A’, is 2.0molL−12.0mol L−1 , how much time does it take for its concentration to come from 0.50 to 0.25mol L−1  if it is a zero order reaction?

  • Question 2/8
    4 / -1

    NaNO3 on being heated to 500∘C gives

  • Question 3/8
    4 / -1

    The structure of diborane (B2H6) contains

  • Question 4/8
    4 / -1

    If 10−4dm3 of water is introduced into a 1.0 dm3 flask to 300 K, how many moles of water are in the vapour phase when equilibrium is established?

    (Given : Vapour pressure of H2O at 300 K is 3170 Pa ; R=8.314JK -1 mol−1

  • Question 5/8
    4 / -1

    One mole of a symmetrical alkene on ozonolysis gives two moles of an aldehyde having a molecular mass of 44 u. The alkene is

  • Question 6/8
    4 / -1

    If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water (ΔTf), when 0.01mol of sodium sulphate is dissolved in 1 kg of water, is (Kf = 1.86 K kgmol−1)

  • Question 7/8
    4 / -1

    From amongst the following alcohols the one that would react fastest with conc. HCl and anhydrous ZnCl2, is 

  • Question 8/8
    4 / -1

    29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed in 20 mL of 0.1 M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralization. The percentage of nitrogen in the compound is

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