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Chemistry Test 261
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Chemistry Test 261
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  • Question 1/10
    4 / -1

    If 5.08 g of a cupric salt is dissolved in water and excess of KI is added to the solution, and the liberated I2 requires 25 ml of M/5 Na2S2O3, where it gets converted into S4O62-, then find the weight percentage of copper in the salt.

    Solutions

     

  • Question 2/10
    4 / -1

    The compound having the highest dipole moment is

    Solutions

    Out of the given compounds, formaldehyde has the highest dipole moment due to the presence of highly electronegative oxygen atom.

     

  • Question 3/10
    4 / -1

    Which of the following is not a buffer solution?

    Solutions

    A buffer solution is that which can resist a change in pH on addition of small amount of acid or base.

    It is of two types:

    (i) An acidic buffer (weak acid in excess + salt of its conjugate base)

    (ii) A basic buffer (weak base in excess + salt of its conjugate acid)

    KClO4 + HClO4 is not a buffer solution because it a mixture of a strong acid (HClO4) and the salt of its conjugate base (KClO4).

    Note: All the other mixtures in the options are perfect buffers.

     

  • Question 4/10
    4 / -1

    A cell utilises the reaction Zn (s) + 2H+ (aq) Zn2+ (aq) + H2 (g). Addition of H2SO4 to the cathode compartment will

    Solutions

    If H2SO4 is added to cathodic compartment, (towards reactant side), then Q decreases (due to increase in H+). Hence equilibrium is displaced towards right and Ecell increases.

     

  • Question 5/10
    4 / -1

    Which of the following series of reactions correctly represents the chemical relations related to iron and its compound?

    Solutions

    Formation of Fe3O4 from Fe corresponds to the combustion of Fe and rest of the reactions correspond to the production of Fe by reduction of Fe3O4 in the blast furnace.

     

  • Question 6/10
    4 / -1

    Which of the following is formed when NaCl is heated with conc. H2SO4 and solid K2Cr2O7?

    Solutions

    NaCl is heated with conc. H2SO4 and solid K2Cr2O7 to give chromyl chloride (orange red) vapours.

     

  • Question 7/10
    4 / -1

    b-particle is emitted in radioactivity by

    Solutions

    Since the nucleus does not contain b-particle, it is produced by the conversion of a neutron to a proton at the moment of emission.

     

  • Question 8/10
    4 / -1

    Which of the following alkenes will react faster with H2 under catalytic hydrogenation conditions?

    Solutions

    The following order of stability of alkenes has been derived from heat of hydrogenation

    R2C = CR2 > R2C = CHR > R2C = CH2 = trans-RCH=CHR > cis-RCH = CHR > RCH = CH2 > CH2 = CH2

    The reactivity order is reverse of the stability order.

     

  • Question 9/10
    4 / -1

    When m-chlorobenzaldehyde is treated with 50% KOH solution, the product(s) obtained is/are

    Solutions

     

  • Question 10/10
    4 / -1

    Among cellulose, poly(vinylchloride), nylon and natural rubber, the polymer in which the intermolecular force of attraction is the weakest is

    Solutions

    Cellulose and nylon are fibres and their intermolecular forces are the strongest. Poly vinyl chloride is a thermoplastic, the intermolecular force in it is neither strong nor weak.

    Natural rubber is an elastomer and the polymers are held by weak van der Waals forces.

    Hence, natural rubber has the weakest forces.

     

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