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Metals which will not evolve H 2 gas with dil . HCl are

Options

  1. ACu, Ag, Au
  2. BCu, Zn, Al
  3. CFe, Ag, Pt
  4. DHg, Mg, Pt

Correct answer

A. Cu, Ag, Au

Step-by-step solution

The metals whose reduction potentials are greater than the reduction potential of Hydrogen do not liberate H 2 gas. H + + e − → 1 2 H 2 ;E ο = 0.00 V Au 3 + + 3 e – → Au E o = + 1.50 V Ag + + e – → Ag E o = + 0.799 V Cu 2 +   +   2   e –    → Cu              E o =   +   0.34   V

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