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Current Question (ID: 8461)

Question:

$(\text{a}) \text{ Human muscle-fluid, pH} = 6.83$ $(\text{b}) \text{ Human stomach fluid, pH} = 1.2$ $(\text{c}) \text{ Human blood, pH} = 7.38$ $(\text{d}) \text{ Human saliva, pH} = 6.4$ $\text{Out of the above mentioned biological fluids, the one with the minimum concentration of hydrogen ions is:}$

Options:

1. $\text{Human blood}$
2. $\text{Human muscle fluid}$
3. $\text{Human stomach fluid}$
4. $\text{Human saliva}$

Solution:

$\textbf{Hint: } \text{pH} = -\log[\text{H}^+] ; \text{ More pH} = \text{Less hydrogen ion concentration}$ $\textbf{Explanation:}$ $\begin{array}{|c|c|c|} \hline \text{Biological Fluids} & \text{pH} = -\log[\text{H}^+] & [\text{H}^+] = \text{antilog}(-\text{pH}) \\ \hline \text{Human muscle-fluid} & 6.83 & = 1.48 \times 10^{-7} \text{ M} \\ \hline \text{Human stomach fluid} & 1.20 & = 0.063 \\ \hline \text{Human blood} & 7.38 & = 4.17 \times 10^{-8} \\ \hline \text{Human Saliva} & 6.40 & = 3.98 \times 10^{-7} \\ \hline \end{array}$ $\text{Thus, the minimum hydrogen ion concentration is in human blood.}$

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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
}