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Which of the following pairs of cations cannot be separated by adding NH4Cl and NH4OH to the mixture — Qualitative and Quantitative Analysis Chemistry Question

Question

Which of the following pairs of cations cannot be separated by adding NH4Cl and NH4OH to the mixture and then passing H2S through it?

Answer: C

💡 Solution & Explanation

Both Co2+ and Ni2+ are Group IV cations and will both precipitate as black sulphides (CoS and NiS) upon passing H2S in basic medium (NH4Cl/NH4OH).

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