JEE Main2014Chemistryd and f Block ElementsActual
The equation which is balanced and represents the correct product(s) is
Options
- ALi 2 O + 2 KCl → 2 LiCl + K 2 O
- BCoCl NH 3 5 + + 5 H + → Co 2 + + 5 NH 4 + + Cl -
- CMg H 2 O 6 2 + + EDTA 4 - → excess   NaOH Mg EDTA 2 + + 6 H 2 O
- DCuSO 4 + 4 KCN → K 2 Cu CN 4 + K 2 SO 4
Correct answer
B. CoCl NH 3 5 + + 5 H + → Co 2 + + 5 NH 4 + + Cl -
Step-by-step solution
Li 2 O + 2 KCl → 2 LiCl + K 2 O is incorrect since, KCl is less reactive than LiCl and will not form LiCl . Mg H 2 O 6 2 + + EDTA 4 - → excess   NaOH Mg EDTA 2 + + 6 H 2 O is incorrect since, the charge on the complex will be - 2 , not + 2 . CuSO 4 + 4 KCN → K 2 Cu CN 4 + K 2 SO 4 is incorrect since, the final complex formed is K 3 Cu CN 4 , not K 2 Cu CN 4 .