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EEJ MAIN Chemistry QUESTION #7162
Question 1
Which of the following chemical equations is correctly balanced and shows the right products?
  • $[Mg(H_{2}O)_{6}]^{2+} + (EDTA)^{4-} \rightarrow [Mg(EDTA)]^{2-} + 6H_{2}O$✔️
  • $CuSO_{4} + 4KCN \rightarrow K_{2}[Cu(CN)_{4}] + K_{2}SO_{4}$
  • $Li_{2}O + 2KCl \rightarrow 2LiCl + K_{2}O$
  • $CO + 2H_{2} \xrightarrow{catalyst} CH_{3}OH$
Correct Answer Explanation
Option 1 is the correct representation of a complexometric reaction where the polydentate ligand EDTA replaces the water molecules coordinated to Magnesium. Note that the charge on the resulting complex is correctly balanced as $2 + (-4) = -2$.