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Current Question (ID: 8457)

Question:

$\text{The pH values of milk, tomato juice, lemon juice, and egg are 6.8, 4.2, 2.2, and 7.8 respectively.}$ $\text{The corresponding hydrogen ion concentration is maximum in:}$

Options:

1. Lemon juice
2. Milk
3. Egg white
4. Tomato juice

Solution:

$\text{Hint: pH} = -\log [\text{H}^+]; \text{More pH} = \text{Less } [\text{H}^+] \text{ concentration}$ $\text{Explanation:}$ $\text{Calculating } [\text{H}^+] \text{ for each substance using } [\text{H}^+] = \text{antilog}(-\text{pH}):$ $\text{Milk: pH} = 6.8, [\text{H}^+] = \text{antilog}(-6.8) = 1.5 \times 10^{-7} \text{ M}$ $\text{Tomato juice: pH} = 4.2, [\text{H}^+] = \text{antilog}(-4.2) = 6.31 \times 10^{-5} \text{ M}$ $\text{Lemon juice: pH} = 2.2, [\text{H}^+] = \text{antilog}(-2.2) = 6.31 \times 10^{-3} \text{ M}$ $\text{Egg white: pH} = 7.8, [\text{H}^+] = \text{antilog}(-7.8) = 1.58 \times 10^{-8} \text{ M}$ $\text{Thus, the hydrogen ion concentration is maximum in lemon juice.}$

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
}