The standard reduction potentials of 2 H ⁺ / H ₂, Cu ²⁺ / Cu . Zn ²⁺ / Zn and NO ₃ ⁻, H ⁺ / NO are 0.0,-0.34,-0.76 and 0.97 V respectively. Observe the following reactions I. Zn + HCl II. Cu + HCl III. Cu + HNO ₃ Which reactions does not li

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The standard reduction potentials of 2 H ⁺ / H ₂, Cu ²⁺ / Cu . Zn ²⁺ / Zn and NO ₃ ⁻, H ⁺ / NO are 0.0,-0.34,-0.76 and 0.97 V respectively. Observe the following reactions I. Zn + HCl II. Cu + HCl III. Cu + HNO ₃ Which reactions does not liberate H ₂( ~g ) ?

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Correct answer: A. II, III only

Higher the reduction potential less in the tendency to librate H ₂ gas.

The standard reduction potentials of 2 H ⁺ / H ₂, Cu ²⁺ / Cu . Zn ²⁺ / Zn and NO ₃ ⁻, H ⁺ / NO are 0.0,-0.34,-0.76 and 0.97 V respectively. Observe the following reactions I. Zn + HCl II. Cu + HCl III. Cu + HNO ₃ Which reactions does not liberate H ₂( ~g ) ?

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