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Chemistry Test 169
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Chemistry Test 169

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  • Question 1/10
    4 / -1

    It is because of inability of ns² electrons of the valence shell

    to participate in bonding that:-

    Solutions

    Inertness of ns² electrons of the valence shell to participate in bonding on moving down the group in heavier p–block elements is called inert pair effect. As a result, Pb(II) is more stable than Pb(IV)

    Sn(IV) is more stable than Sn(II)

    Pb(IV) is easily reduced to Pb(II) and can acts as an oxidizing agent whereas Sn(II) is easily oxidized to Sn(IV) and can acts as a reducing agent.

     

  • Question 2/10
    4 / -1

    Base strength of:

    Solutions

    The amount of s–character in various hybrid orbitals is as follows.

    Sp=50%, Sp²=33%, and Sp³=25%,

    Therefore s character of the C–H bond in acetylene (sp) is greater than that of the C–H bond in alkene (sp² hybridized) which in turn has greater s character of the C–H bond than in alkanes. Thus

    owing to a high s character of the C–H bond in alkynes, the electrons constituting this bond are more strongly held by the carbon nucleus with the result the hydrogen present on such a carbon atom  can be easily removed as proton. The acidic nature of three types of C–H bonds follows the following order.

     

  • Question 3/10
    4 / -1

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  • Question 4/10
    4 / -1

    Identify the incorrect statement from the following :

    Solutions

    The ozone layer, existing between 20 to 35 km above the earth’s surface, shield the earth from the harmful U.V. radiations from the sun.

     

  • Question 5/10
    4 / -1

    The second order Bragg diffraction of X-rays with  from a set of parallel planes in a metal occurs at an angle of 60°. The distance between the scattering planes in the crystal is

    Solutions

     

  • Question 6/10
    4 / -1

    We have three aqueous solutions of NaCl labelled as 'A', 'B' and 'C' with concentrations 0.1M, 0.01M and 0.001M, respectively. The value of van't Hoff factor for these solutions will be in the order ________.

  • Question 7/10
    4 / -1

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  • Question 8/10
    4 / -1

    Half life period of a first-order reaction is 1386 seconds. The specific rate constant of the reaction is:

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  • Question 9/10
    4 / -1

    The heats of adsorption in physisorption lie in the range (in kJ/mol)

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  • Question 10/10
    4 / -1

    Aluminium is extracted from alumina  by electrolysis of a molten mixture of

    Solutions

     

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