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The equation which is balanced and represents the correct product(s) is -

1. [CoCl(NH 3 ) 5 ] + + 5H + → Co 2+ + 5NH 4 + + Cl –
2. [Mg(H 2 O) 6 ] 2+ + (EDTA) 4–     →  NaOH excess [Mg(EDTA)] 2+ + 6H 2 O
3. CuSO 4 + 4KCN → K 2 [Cu(CN) 4 ] + K 2 SO 4
4. Li 2 O + 2KCl → 2LiCl + K 2 O

Correct answer: [CoCl(NH 3 ) 5 ] + + 5H + → Co 2+ + 5NH 4 + + Cl –

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