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Current Question (ID: 8522)

Question:

$\text{The salt that gives a neutral solution in water is:}$

Options:

1. $\text{KBr}$
2. $\text{NH}_4\text{NO}_3$
3. $\text{NaCN}$
4. $\text{Rb}_2(\text{CO}_3)$

Solution:

\text{Hint: Salt of a strong base and strong acid form neutral solution.} \text{Explanation:} \text{(i) } \text{Rb}_2\text{CO}_3 \text{Rb}_2\text{CO}_3 + \text{H}_2\text{O} \rightleftharpoons \text{RbOH (strong base) + H}_2\text{CO}_3\text{ (weak acid)} \text{Therefore, it is a basic solution.} \text{(ii) } \text{KBr:} \text{KBr} + \text{H}_2\text{O} \rightleftharpoons \text{KOH (strong base) + HBr (strong acid)} \text{Therefore, it is a neutral solution.} \text{(iii) } \text{NaCN:} \text{NaCN} + \text{H}_2\text{O} \rightleftharpoons \text{HCN (weak acid) + NaOH (strong base)} \text{Therefore, it is a basic solution.} \text{(iv) } \text{NH}_4\text{NO}_3 \text{NH}_4\text{NO}_3 + \text{H}_2\text{O} \rightleftharpoons \text{NH}_4\text{OH (weak base) + HNO}_3\text{ (strong acid)} \text{Therefore, it is an acidic solution.}

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
}