Chemisty:2003:CBSE:[Delhi]:Set-I

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  • Q1

    Write all the four quantum numbers of the electron in the outermost shell of rubidium (Atomic no.=37).

    Marks:1
    Answer:

    Question not in syllabus.

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  • Q2

    What type of hybridisation is associated with N in NH3? What is the expected bond angle in NH3?

    Marks:1
    Answer:

    Hybridisation associated with N in NH3 is sp3. The expected bond angle in NH3 109.28º

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  • Q3

    Mention one property which is caused due to presence of F-centre in the solid.

    Marks:1
    Answer:

    The solids having F-centres become coloured.

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  • Q4

    Write Nernst equation for single electrode potential.

    Marks:1
    Answer:

     

     

     

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  • Q5

    Comlpete the nuclear equation out of syllabus

    41H1 + 4He2  →

    Marks:1
    Answer:

    Not in the XII syllabus.

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  • Q6

    How does chemical adsorption of a gas on solid vary with temperature?

    Marks:1
    Answer:

    The rate of chemical adsorption decreases with increase in temperature.

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  • Q7

    Mention the chief reasons for the anomalous behaviour of lithium in group 1 of the periodic table. out of syllabus

    Marks:1
    Answer:

    This question is not in 2007-2008 syllabus.

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  • Q8

    Why is the third ionization energy of manganese (Atomic no.= 25) unexpectedly high?

    Marks:1
    Answer:

    Mn (Ground state); 1s2, 2s2, 2p6,3s2, 3p6 ,4s2, 3d5.After the loss of two electrons it becomes Mn2+ having configuration 1s2, 2s2, 2p6,3s2, 3p6 ,4s0, 3d5.It is extra stable due to exactly half filled 3d orbital, as a result third ionisation energy of manganese is unexpectedly high.

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  • Q9

    Write IUPAC name of the complex Na3[Cr(OH)2F4].

    Marks:1
    Answer:

    Sodiumtetrafluorodihydroxochromate(III)

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  • Q10

    Mention two main functions of lipid.

    Marks:1
    Answer:

    Not in the XII syllabus.

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