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BITSAT 2018
Exam
BITSAT
Year
2018
Subject
Chemistry
Chapter
d and f Block Elements

BITSAT 2018 · Chemistry · d and f Block Elements

When dil. sulphuric acid reacts with aqueous solution of potassium...

When dil. sulphuric acid reacts with aqueous solution of potassium chromate, the colour changes from yellow to orange. This shows that

Options

  1. Achromate ions reduced
  2. Bchromate ions are oxidised
  3. Cmonocentric complex is converted into dicentric complex
  4. Doxygen gets removed from chromate ions

Correct answer

C. monocentric complex is converted into dicentric complex

Step-by-step solution

On acidification of potassium chromate solution, yellow colour changes to orange colour due to formation of dichromate which suggests that monocentric complex is converted into dicentric complex.

2K2CrO4+H2SO4Dil.⟶K2Cr2O7+K2SO4+H2O2{K}_{2}{CrO}_{4} + \mathop{{H}_{2}{SO}_{4}}_{\text{Dil.}} ⟶ {K}_{2}{Cr}_{2}{O}_{7} + {K}_{2}{SO}_{4} + {H}_{2}O

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