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    The p-Block Elements
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    Write balance equations for the following reaction:
    Cu+conc. H2SO4  →

    Cu+(conc). 2H2SO4 →  CuSO4 + 2H2O + SO2
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    SF6 is known but SCl6 is not known.

    SF6 is known but SCl6 is not known Due to small size of S, six large Cl atoms cannot be accommodated around S atom, but small six F atoms can be easily accommodated around S atom to form SF6. Moreover, because of low electronegativity of Cl, it cannot easily cause promotion of electrons in S to form S(VI).
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    NF3 does not have donor properties like ammonia. Explain.
    NF3 has a pyramidal shape with one lone-pair on N atom.

    The lone-pair on N is in opposite direction to the N—F bond moments and therefore it has very low dipole moment (about 0.234 D). Thus it does not show donor properties. But ammonia has high dipole moment because its lone pair is in the same direction as the N—H bond moments. Thus it has donor properties.
     The electronegtivity also influence  the donar properties. fluorine is more electronegtive than hydrogen thus fluroine pull electron from nitrogen but hydrogen is not.
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    Account for the following:
    On addition of ozone gas to KI solution, violet vapours are obtained.

    On addition of ozone gas to KI solution. Ozone is oxidizing iodide ion to I2 the elemental from of iodine thus elemental iodine readlily undergoes sublimation to form the violet gas.

    2KI + H2O+ O3 → 2KOH + I2 + O2

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    Write balance equation for the following reaction:
    SF4+H2O →catalyst


    Balance equation :

    SF4+H2O →catalyst SO2+4HF
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