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NEST2020Chemistryd and f Block Elements

Potassium dichromate is a very important chemical used in industry and extensively used as an oxidizing agent in organic chemistry. Dichromates are generally prepared from chromate, which in turn is obtained from chromite ore ( FeCr ₂ O ₄ ) . Reaction of potassium dichromate with concentrated HCl and zinc powder forms octahedral CrCl ₃ n H ₂ O ( Y ) . Y on reaction with concentrated NH ₃ solution forms a compound Z h

Options

  1. AZnCl ₂ is formed during the reaction of potassium dichromate with con. HCl .
  2. BThe oxidation number of Cr in potassium dichromate and in the chromite ore are +6 and +3 respectively.
  3. CY and Z exhibit geometrical isomerism.
  4. DZ absorbs light at shorter wavelength compared to Y .

Correct answer

D. Z absorbs light at shorter wavelength compared to Y .

Step-by-step solution

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