Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
KVPY2017Chemistryd and f Block Elements

The fusion of chromite ore ( FeCr ₂ O ₄ ) with Na ₂ CO ₃ in air gives a yellow solution upon addition of water. Subsequent treatment with H ₂ SO ₄ produces an orange solution. The yellow and orange colours, respectively, are due to the formation of

Options

  1. ANa ₂ CrO ₄ and Na ₂ Cr ₂ O ₇
  2. BCr ( OH )₃ and Na ₂ Cr ₂ O ₇
  3. CCr ₂ ( CO ₃ )₃ and Fe ₂ ( SO ₄ )₃
  4. DCr ( OH )₃ and Na ₂ CrO ₄

Correct answer

A. Na ₂ CrO ₄ and Na ₂ Cr ₂ O ₇

Step-by-step solution

8 Na ₂ CO ₃+4 FeCr ₂ O ₄+7 O ₂ Na ₂ CrO ₄+2 Fe ₂ O ₃+8 O ₂ yellow colour 2 Na ₂ CrO ₄ 2 H ⁺ Na ₂ Cr ₂ O ₇+2 Na ⁺+ H ₂ O yellow orange

Practice d and f Block Elements on Quantrex Academy →

More from d and f Block Elements

Pick out the correct option Assertion(A): Mercury is not considered as a transition element Reason (R): Mercury is a liquid 2026Which of the following does not correctly represent the order of the property indicated against it? 2026The element with the highest third ionisation enthalpy is: 2026The product and its colour when MnO₂ is fused with KOH in presence of O₂ : 2026The ion that has a spin only magnetic moment of 5.9 BM is: 2026Which one of the following species will impart colour to an aqueous solution? 2026The basic character of transition metal monoxides follows the order: 2026K ₂ Cr ₂ O ₇ on heating with aqueous NaOH gives ------------------------- 2026 Full d and f Block Elements list All KVPY PYQs