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NEET · Chemistry · STD 12 - 4. d and f- block elements

जलीय विलयनों में \(Cu ^{2+}\) लवणों का स्थायित्व \(Cu ^{+}\)लवणों से अधिक निम्नलिखित के कारण होता है:

  1. A द्वितीय आयनन एन्थैल्पी
  2. B प्रथम आयनन एन्थैल्पी
  3. C कणन एन्थैल्पी
  4. D जलयोजन ऊर्जा
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(D) जलयोजन ऊर्जा

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The stability of \(Cu ^{2 +}( aq )\) is more than \(Cu ^+ ( aq )\) is due to the much more negative \(\Delta_{\text {hyd }} H^{\circ}\) of \(Cu ^{2+}( aq )\) than \(Cu ^{+}( aq )\), which more than compensates for second ionisation enthalpy of \(Cu\). \(\Delta \text { hyd } H ^{\circ} \text { of } Cu ^{2+}( aq )=-2121\,kJ\,mol ^{-1}\)
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