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JEE Main Test 88

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JEE Main Test 88
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Weekly Quiz Competition
  • Question 1
    4 / -1

    In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will be

    Solution

    The number of tetrahedral voids in CCP = 2N.

    Imagine if the no. of atoms in y elements in CCP = 100

    Then, tetrahedral void in CCP = 2×100 = 200

    If element X occupy 2/3rd of tetrahedral void

    Then no. of atoms in x element = 2/3 × 200 = 400/3

    Then the ratio of X and Y will be

    X: Y = 400/3: 100

    ⇒ X/Y = 400/ (3×100) = 400/300 = 4/3

    Hence the formula of the compound will be X4Y3.

     

  • Question 2
    4 / -1

    Which of the following complex formation indicates presence of sulphur in the organic compound when sodium nitroprusside is added to sodium extract of the compound ?

    Solution

     

  • Question 3
    4 / -1

    Solution

    Hexene on treating with osmium tetraoxide in the presence of Hydrogen peroxide gives meso – diol.

     

  • Question 4
    4 / -1

    Solution

     

  • Question 5
    4 / -1

    The specific conductance (κ) of an electrolyte of 0.1 N concentration is related to equivalent conductance (Ʌ) by the following formula

  • Question 6
    4 / -1

    The molar conductivities Ʌo NaOAc and Ʌo HCl at infinite dilution in water at 25oC are 91.0 and 426.2 S cm2/mol respectively. To calculate ɅoHOAc, the additional value required is

    Solution

     

  • Question 7
    4 / -1

    The Henry's law constant for the solubility of N2 gas in water at 298 K is 1.0 × 105 atm. The mole fraction of N2 in air is 0.8. The number of mols of N2 from air dissolved in 10 moles of water of 298 K and 5 atm pressure is

    Solution

     

  • Question 8
    4 / -1

    How long (in hours) must a current of 5.0 A be maintained to electroplate 60 g of calcium from molten CaCl2?

    Solution

     

  • Question 9
    4 / -1

    Solution

    Metals having more standard electrode potential will deposit rapidly.

    Given, Ag+/Ag = +0.80V

                Cu2+/Cu = +0.34V

                Hg22+/Hg = +0.79 and Mg2+/Mg = -2.37V

    Hence the order is Ag>Hg>Cu.

     

  • Question 10
    4 / -1

    For a first order reaction, (A) → products, the concentration of A changes from 0.1 M to 0.025 M in 40 min. The rate of reaction when the concentration of A is 0.01 M is

    Solution

     

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