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BITSAT2010Chemistryp Block Elements (Group 13 & 14)Actual

Three separate samples of a solution of a single salt gave these results. One formed a white precipitate with excess ammonia solution, one formed a white precipitate with dil. HCl solution and one formed a black precipitate with H ₂ ~S . The salt could be

Options

  1. AAgNO ₃
  2. BPb ( NO ₃ )₂
  3. CHg ( NO ₃ )₂
  4. DMnSO ₄

Correct answer

B. Pb ( NO ₃ )₂

Step-by-step solution

Pb ( NO ₃ )₂+2 NH ₄ OH array r Pb ( OH )₂ +2 NH ₄ NO ₃( white ppt ) Pb ( NO ₃ )₂+2 HCl PbCl ₂ +2 HNO ₃( whiteppt ) Pb ( NO ₃ )₂+ H ₂ ~S PbS +2 HNO ₃ (black) array

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