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NEST2021Chemistryd and f Block Elements

A chromite ore ' P ' reacts with calcined soda to form a yellow coloured solution containing iron(III) oxide and compound ' Q '. This solution is filtered and the filtrate is acidified with sulphuric acid to form an orange solution containing compound ' R ', which can be crystallized. In solution, the compounds ' Q ' and ' R ' are inter-convertible depending on the pH of the solution. ' R ' on treatment with potassiu

Options

  1. AThe chromite ore ' P ' contains only Cr and oxide ions.
  2. BThe oxidation state of the Cr in ' Q ' is +3 , whereas in ' R ' and ' S ' it is +6
  3. CThe geometry around Cr in ' Q ', ' R ' and ' S ' is tetrahedral.
  4. DThe acidified 'S' reacts with Fe ²⁺ ions and changes them into Fe ³⁺ ions.

Correct answer

D. The acidified 'S' reacts with Fe ²⁺ ions and changes them into Fe ³⁺ ions.

Step-by-step solution

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