Question:

A mixture of two salts is used to prepare a solution S, which gives the following results:

\(\text{White precipitate(s) only} \underset{\text{Room temperature}}{\overset{\text{Dilute NaOH(aq)}}{\longleftarrow}} \text{S (aq solution of the salts)}\underset{\text{Room temperature}}{\overset{\text{Dilute HCl(aq)}}{\longrightarrow}} \text{White precipitate(s) only}\)
The correct option(s) for the salt mixture is(are)

Updated On: May 23, 2024
  • Pb(NO3)2 and Zn(NO3)2

  • Pb(NO3)2 and Bi(NO3)2

  • AgNO3 and Bi(NO3)3

  • Pb(NO3)2 and Hg(NO3)2

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The Correct Option is A, B, C

Solution and Explanation

The accurate choice is C. 
Silver nitrate Ag(NO3​) and bismuth nitrate Bi(NO3​)3​) result in white precipitates. 
Similarly, lead hydroxide Pb(OH)2​), zinc hydroxide Zn(OH)2​), and bismuth hydroxideBi(OH)3​) form white precipitates. 
However, mercury hydroxide Hg(OH)2​) is unstable and does not yield a white precipitate. 
Lead chloride PbCl2 is also noted as a white precipitate. 

Therefore, options (A), (B), and (C) are deemed correct.

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