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Redox Reactions question

2020 · 2 Sep · Shift 1 · Q8
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Redox Reactions question

2020 · 2 Sep · Shift 1 · Q8

JEE MainChemistryRedox ReactionsMCQ+4 / −1
While titrating dilute HCl solution with aqueous NaOH, which of the following will not be required?
  1. A
    Pipette and distilled water
  2. B
    Clamp and phenolphthalein
  3. C
    Burette and porcelain tile
  4. D
    Bunsen burner and measuring cylinder
View written solutionFree

Correct answer: D

  1. Identify the experiment

    The titration is: dilute HCl solution titrated with aqueous NaOH.

    This is a simple acid–base titration: HCl+NaOH→NaCl+H2O\text{HCl} + \text{NaOH} \rightarrow \text{NaCl} + \text{H}_2\text{O}HCl+NaOH→NaCl+H2​O

  2. List the usual apparatus required in an acid–base titration

    For such a titration, we generally need:

    • Pipette: to measure a fixed volume of acid/base
    • Burette: to deliver the titrant accurately
    • Clamp/stand: to hold the burette
    • Indicator (here, phenolphthalein can be used)
    • Distilled water: for washing apparatus
    • White/porcelain tile: to observe the endpoint clearly
  3. Check each option

    Option A: Pipette and distilled water

    • Pipette is required.
    • Distilled water is required for rinsing/washing.
    • So, this is required.

    Option B: Clamp and phenolphthalein

    • Clamp is required to hold the burette.
    • Phenolphthalein is a suitable indicator for strong acid–strong base titration.
    • So, this is required.

    Option C: Burette and porcelain tile

    • Burette is essential.
    • Porcelain tile helps in seeing the colour change clearly.
    • So, this is required.

    Option D: Bunsen burner and measuring cylinder

    • Bunsen burner is not needed in a normal acid–base titration.
    • Measuring cylinder is not used for accurate titration measurements; pipette and burette are used instead.
    • So, this option contains apparatus that will not be required.
  4. Conclusion

    The apparatus not required is: D: Bunsen burner and measuring cylinder\boxed{\text{D: Bunsen burner and measuring cylinder}}D: Bunsen burner and measuring cylinder​

  5. Comparison with stored correct answer

    Stored correct answer: D

    My derived answer is also D, so they agree.

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