Find the number of correct statement(s) is/are : (i) Both double salts as well as complexes are formed by the combination of two or more stable compounds in stoichiometric ratio (ii) Double salts such

Question

Find the number of correct statement(s) is/are :

(i) Both double salts as well as complexes are formed by the combination of two or more stable compounds in stoichiometric ratio

(ii) Double salts such as carnallite, $KCl \cdot MgCl_{2} \cdot 6 H_{2} O$ , potash alum, $KAl (SO_{4})_{2} \cdot 12 H_{2} O$ , etc. dissociate into simplex ions completely when dissolved in water

(iii) Complex ions such as $[Fe (CN)_{6}]^{4 -}$ of $K_{4} Fe (CN)_{6}$ , do not dissociate into $Fe^{2 +}$ and $CN^{-}$ ions

(iv) Mohr's salt, $FeSO_{4} \cdot (NH_{4})_{2} SO_{4} \cdot 6 H_{2} O$ does not, dissociate into simple ions completely when dissolved in water

(v) $[CoCl_{2} (NH_{3})_{4}] Cl$ complex dissociate into $Co^{3 +}$ and $Cl^{-}$ ions

TestHub · Accepted Answer

(i) Correct. Both double salts and complexes are formed by combining stable compounds in stoichiometric ratios.

(ii) Correct. Double salts like carnallite and potash alum dissociate completely into their constituent simple ions in water.

(iii) Correct. Complex ions like $[Fe (CN)_{6}]^{4 -}$ are stable and do not dissociate into $Fe^{2 +}$ and $CN^{-}$ ions in solution.

(iv) Incorrect. Mohr's salt is a double salt and dissociates completely into simple ions in water.

(v) Incorrect. The complex ion $[CoCl_{2} (NH_{3})_{4}]^{+}$ dissociates from the counter ion $Cl^{-}$ , but the complex ion itself does not dissociate into $Co^{3 +}$ and $Cl^{-}$ ions.

Therefore, the correct statements are (i), (ii), and (iii).

Number of correct statements = 3.

Chemistry - Coordination Chemistry Question with Solution | TestHub

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