Trying to find the right answer to this..

Cr 2+ liberates hydrogen gas when treated with dilute acids. 2Cr 2+ (aq) + 2H + (aq) → 2Cr 3+ (aq) + H 2 (g) ↑

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

The d-And-f-Block Elements

Short Answer Type

41.

Why V and Mn has E° value more than E° value of Cr?

172 Views

42. What may be the stable oxidation state of the transition elements with the following d-electron configurations in the ground state of their atoms 3d³, 3d⁵, 3d⁸ and 3d⁴?

165 Views

43. Transition metals tend to be less reactive. Explain

169 Views

44.

Compare qualitatively the first and second ionisation potentials of copper and zinc. Explain the above observation.

397 Views

45.

What does the E° value of M³⁺/M²⁺ show for Mn³⁺and Co³⁺ (+ 1.57 and 1.97 V respectively)?

210 Views

46. Ti²⁺, V²⁺and Cr²⁺are strong reducing agents. Why?

488 Views

47. Give a reaction to show that Cr²⁺ acts as a reducing agent.

Cr²⁺ liberates hydrogen gas when treated with dilute acids.
2Cr²⁺ (aq) + 2H⁺ (aq) → 2Cr³⁺ (aq) + H₂ (g) ↑

167 Views

48. Why is the E° value for Mn³⁺/Mn²⁺ higher than that of Cr³⁺/ Cr²⁺ (or Fe³⁺/Fe²⁺)?

194 Views

49. How would you account for the increasing oxidising power in the series VO₂⁺< Cr₂O₇^2– < MnO₄–?

580 Views

50. The ionisation enthalpies of Cr and Cu are larger than their neighbours. Why?

204 Views

Previous Year Papers

Test Series

Test Yourself

Short Answer Type

47. Give a reaction to show that Cr2+ acts as a reducing agent.

47. Give a reaction to show that Cr²⁺ acts as a reducing agent.