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  • Which one of the following statements is correct?Option: 1 Manganese salts give a violet borax test in the reducing flame.<div class='q

Which one of the following statements is correct?

Option: 1

Manganese salts give a violet borax test in the reducing flame.


Option: 2

From a mixed precipitate of AgCl and Agl , ammonia solution dissolves only AgCl


Option: 3

Ferric ions give a deep green precipitate on adding potassium ferrocyanide solution.


Option: 4

On boiling a solution having K^{+},Ca^{2+}\: \: and\: \: HCO_3^{-}   ions we get a precipitate of K_2Ca(CO_3)_2


Answers (1)

best_answer

The solubility product for AgCl and AgI are 1.8\times 10^{10} \ and \ 8.3\times 10^{-17} respectively when ammonia is added,

Ag^{+}(aq) + 2NH_{3}(aq)\leftrightharpoons [Ag(NH_{3})_{2}]^{+}(aq)

this lowers Ag^+ concertration and allows more dissociation and dissolving the precipitate but AgI dissociation is so low that there is the negligible effect.

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vinayak

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