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Current Question (ID: 18396)

Question:

$\text{On increasing the temperature:}$ $1.\ \text{The extent of adsorption increases in physisorption.}$ $2.\ \text{The extent of adsorption decreases in physisorption.}$ $3.\ \text{No effect on adsorption.}$ $4.\ \text{The extent of adsorption first decreases, then increases.}$

Options:

1. $\text{The extent of adsorption increases in physisorption.}$
2. $\text{The extent of adsorption decreases in physisorption.}$
3. $\text{No effect on adsorption.}$
4. $\text{The extent of adsorption first decreases, then increases.}$

Solution:

$\text{HINT: The rate of adsorption decreases with an increase in temperature.}$ $\text{Explanation:}$ $\text{If the accumulation of gas on the surface of a solid occurs on account of weak Van der Waals' forces, the adsorption is termed physical adsorption or physisorption.}$ $\text{Various characteristics of Physisorption are-}$ $\text{It arises because of Van der Waals' forces}$ $\text{It is not specific in nature}$ $\text{It is reversible in nature}$ $\text{Enthalpy of adsorption is low (20-40 kJ mol}^{-1}\text{)}$ $\text{Low temperature is favourable for adsorption. It decreases with the increase in temperature.}$

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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
}