NEETChemistryCoordination Compounds
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Mohr's salt is a double salt and its aqueous solution gives a positive test for Fe ²⁺ ions, whereas K ₃[ Fe ( CN )₆] is a coordination complex and its aqueous solution does not give a positive test for Fe ³⁺ ions. Reason (R): In double salts, the constituent simple ions completely lose their identi
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
C. (A) is correct but (R) is not correct
Step-by-step solution
Assertion (A) is correct. Mohr's salt, FeSO ₄ ( NH ₄)₂ SO ₄ 6 H ₂ O , is a double salt that dissociates completely into simple ions ( Fe ²⁺ , NH ₄^+ , and SO ₄²⁻ ) in aqueous solution, thus giving a positive test for Fe ²⁺ . On the other hand, K ₃[ Fe ( CN )₆] is a coordination complex that yields K ^+ and the complex ion [ Fe ( CN )₆]³⁻ . The complex ion does not dissociate further, so it does not give a test for Fe ³⁺ ions. Reason (R) is not correct. According to NCERT, double salts lose their identity as a compo