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Transition and Inner Transition Elements — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistryTransition and Inner Transition Elements1 Mark
MCQ
Which of the following statements is not true?
  • A
    on passing $\mathrm{H}_2 \mathrm{S}$, through acidified $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ solution, a milky colour is observed.
  • ✓
    $\mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is preferred over $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ in volumetric analysis
  • C
    $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ solution in acidic medium is orange in colour
  • D
    $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ solution becomes yellow on increasing the $\mathrm{P}^{\mathrm{H}}$ beyond 7
✓

Answer

Correct option: B.
$\mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is preferred over $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ in volumetric analysis
$\mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7$ is preferred over $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ in volumetric analysis

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