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Current Question (ID: 8467)

Question:

$\text{The pH of } 0.1 \text{ M solution of the following compounds increases in the order of}$

Options:

1. $\text{NaCl} < \text{NH}_4\text{Cl} < \text{NaCN} < \text{HCl}$
2. $\text{HCl} < \text{NH}_4\text{Cl} < \text{NaCl} < \text{NaCN}$
3. $\text{NaCN} < \text{NH}_4\text{Cl} < \text{NaCl} < \text{HCl}$
4. $\text{HCl} < \text{NaCl} < \text{NaCN} < \text{NH}_4\text{Cl}$

Solution:

$\textbf{Hint: } \text{Acidic solution pH is less than 7 and basic solution pH is more than 7.}$ $\text{HCl is a Strong acid}$ $\text{NH}_4\text{Cl} : \text{Salt of weak base + strong acid} \rightarrow \text{it gives acidic solution.}$ $\text{NaCl} : \text{Salt of strong base + strong acid} \rightarrow \text{it gives neutral solution with pH} = 7.$ $\text{NaCN} : \text{Salt of strong base + weak acid} \rightarrow \text{it gives solution with pH} > 7.$ $\text{Thus the increasing order of pH is as follows:}$ $\text{HCl} < \text{NH}_4\text{Cl} < \text{NaCl} < \text{NaCN}$

Import JSON File

Upload a JSON file containing LaTeX/MathJax formatted question, options, and solution.

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
}