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NEET-XII-Physics

33: Thermal and Chemical Effects of Electric Current

with Solutions - page 5
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  • #16
    Find the charge required to flow through an electrolyte to liberate one atom of (a) a monovalent material and (b) a divalent material.
    Ans : (a) Amount of charge required by 1 equivalent mass of the substance = 96500 C
    For a monovalent material,
    equivalent mass = molecular mass
    ⇒ Amount of charge required by 6.023 × 1023 atoms = 96500 C
    ∴ Amount of charge required by 1 atom = `` \frac{96500}{6.023\times {10}^{23}}=1.6\times {10}^{-19}\,\mathrm{\,C\,}`` (b) For a divalent material,
    equivalent mass =`` \frac{1}{2}``molecular mass
    ⇒ Amount of charge required by `` \frac{1}{2}`` × 6.023 × 1023 = 96500 C
    ∴ Amount of charge required by 1 atom = 1.6 × 2 × 10-19 = 3.2 × 10-19 C
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  • #16-a
    a monovalent material and
    Ans : Amount of charge required by 1 equivalent mass of the substance = 96500 C
    For a monovalent material,
    equivalent mass = molecular mass
    ⇒ Amount of charge required by 6.023 × 1023 atoms = 96500 C
    ∴ Amount of charge required by 1 atom = `` \frac{96500}{6.023\times {10}^{23}}=1.6\times {10}^{-19}\,\mathrm{\,C\,}``
  • #16-b
    a divalent material.
    Ans : For a divalent material,
    equivalent mass =`` \frac{1}{2}``molecular mass
    ⇒ Amount of charge required by `` \frac{1}{2}`` × 6.023 × 1023 = 96500 C
    ∴ Amount of charge required by 1 atom = 1.6 × 2 × 10-19 = 3.2 × 10-19 C
    Page No 219: