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Q.

Which of the following statements is correct?

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a

(a) On boiling a solution having $K^{+}$ , $C a^{2 +}$ and $H C {O^{-}}_{3}$ ions we get a precipitate of $K_{2} C a {(C O_{3})}_{2}$

b

(b) Manganese salts give a violet borax bead test in the reducing flame

c

(c) From a mixed precipitate of AgCl and AgI, ammonia solution dissolves only AgCl

d

(d) Ferric ions give a deep green precipitate on adding potassium ferrocyanide solution

answer is C.

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Detailed Solution

From a mixed precipitate of AgCl and AgI, ammonia solution dissolves only AgCl .Statement C is correct.

As a result of having more electrons in their anions, AgBr and AgI have even higher lattice energies. Since they are less soluble than AgCl, they are even less soluble. Only AgCl dissolves in ammonia solution due to AgCl's higher solubility than AgI, which leads to the formation of a complex.

Hence, option C is correct.

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