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Olympiad workbookNSECGeneral Principles and Processes of Isolation of Metals

P, Q, R and S are four metals whose typical reactions are given below. (I) Only Q and R react with dilute HCl to give H ₂ gas. (II) When Q is added to a solution containing the ions of the other metals, metallic P , R and S are formed. (III) P reacts with concentrated HNO ₃ but S does not. The correct order of their reducing character is:

Options

  1. AS < P < R < Q
  2. BS < R < P < Q
  3. CR < Q < P < S
  4. DQ < P < S < R

Correct answer

A. S < P < R < Q

Step-by-step solution

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