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JEE Main202228 Jul 2022Morning ShiftChemistryd and f Block ElementsActual

Which of the following has least tendency to liberate H 2 from mineral acids?

Options

  1. ACu
  2. BMn
  3. CNi
  4. DZn

Correct answer

A. Cu

Step-by-step solution

Element M E ⊝ / V Mn - 1 . 18 Ni - 0 . 25 Cu 0 . 34 Zn - 0 . 76 As we can see that Copper is least electropositive metal among the given options. So, it does not react with dilute sulphuric acid or other mineral acids, liberating hydrogen because copper is lower in electrochemical series than hydrogen. All other metals will react with mineral acids to liberate hydrogen gas.

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