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Current Question (ID: 18760)

Question:

$\text{The correct statement among the following is:}$ $1.\ \text{If } \Delta_0 < P, \text{ low spin state is more stable.}$ $2.\ \text{CO is a very weak ligand.}$ $3.\ \text{The colour of a complex depends only on the nature of metal ion.}$ $4.\ \text{CO is a weak base but strong ligand.}$

Options:

1. $\text{If } \Delta_0 < P, \text{ low spin state is more stable.}$
2. $\text{CO is a very weak ligand.}$
3. $\text{The colour of a complex depends only on the nature of metal ion.}$
4. $\text{CO is a weak base but strong ligand.}$

Solution:

$\text{HINT: CO is a strong field ligand.}$ $\text{Explanation:}$ $1.\ \text{The first statement is wrong because if } \Delta_0 < P, \text{ the high spin state is more stable.}$ $2.\ \text{The second statement is wrong because CO is a strong field ligand, not a weak field.}$ $\text{The order of strength of ligands can be seen by spectrochemical series:}$ $\text{CO, CN} > \text{phen} > \text{en} > \text{NH}_3 > \text{NCS}^- > \text{H}_2\text{O} > \text{F}^- > \text{RCO}_2^- > \text{OH}^- > \text{Cl}^- > \text{Br}^- $ $\text{Strong field, } \pi \text{ acceptors, large } \Delta, \text{ low spin}$ $\text{Weak field, } \pi \text{ donors, small } \Delta, \text{ high spin}$ $3.\ \text{The third statement is wrong because the colour of a complex does not only depend on the nature of the metal ion it also depends on the nature of the ligand.}$ $4.\ \text{This is correct because CO is a weak base but a strong field ligand.}$

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Expected JSON Format:

{
  "question": "The mass of carbon present in 0.5 mole of $\\mathrm{K}_4[\\mathrm{Fe(CN)}_6]$ is:",
  "options": [
    {
      "id": 1,
      "text": "1.8 g"
    },
    {
      "id": 2,
      "text": "18 g"
    },
    {
      "id": 3,
      "text": "3.6 g"
    },
    {
      "id": 4,
      "text": "36 g"
    }
  ],
  "solution": "\\begin{align}\n&\\text{Hint: Mole concept}\\\\\n&1 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\text{ moles of carbon atom}\\\\\n&0.5 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\times 0.5 \\text{ mol} = 3 \\text{ mol}\\\\\n&1 \\text{ mol of carbon} = 12 \\text{ g}\\\\\n&3 \\text{ mol carbon} = 12 \\times 3 = 36 \\text{ g}\\\\\n&\\text{Hence, 36 g mass of carbon present in 0.5 mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6].\n\\end{align}",
  "correct_answer": 4
}