Multiple Choice

The correct statement(s) about $$\displaystyle Cr^{2+}$$ and $$\displaystyle Mn^{3+}$$ is(are): $$\displaystyle \mathrm {\left [ Atomic\ numbers\ of\ Cr = 24\ and\ Mn = 25 \right ]}$$

A$$\displaystyle Cr^{2+}$$ is a reducing agent
Correct Answer
B$$\displaystyle Mn^{3+}$$ is an oxidizing agent
Correct Answer
CBoth $$\displaystyle Cr^{2+}$$ and $$\displaystyle Mn^{3+}$$ exhibit $$\displaystyle d^{4}$$ electronic configuration
Correct Answer
DWhen $$\displaystyle Cr^{2+}$$ is used as a reducing agent, the chromium ion attains $$\displaystyle d^{5}$$ electronic configuration

Solution

(A) $$\displaystyle Cr^{2+}$$ is a reducing agent. It itself loses electrons (and hence acts as a reducing agent) and forms higher oxidation states. In fact, +6 oxidation state of Cr is very stable.

Hence, the option (A) is correct.

(B) $$\displaystyle Mn^{3+}$$ is an oxidizing agent. It itself gains electrons (and hence acts as an oxidizing agent) to form $$Mn^{2+}$$ with $$3d^5$$ electronic configuration which is stable as it is half-filled.

Hence, the option (B) is correct.

(C) Cr and Mn have outer ionic configurations of $$3d^54s^1$$ and $$3d^54s^2$$ respectively.
Hence, both $$\displaystyle Cr^{2+}$$ and $$\displaystyle Mn^{3+}$$ exhibit $$\displaystyle d^{4}$$ electronic configuration.

Hence, the option (C) is correct.

(D) When $$\displaystyle Cr^{2+}$$ is used as a reducing agent, the chromium ion attains $$\displaystyle d^{3}$$ (as in $$Cr^{3+}$$) electronic configuration.

Hence, the option (D) is incorrect.

SIMILAR QUESTIONS

d - block and f - block Elements

Compounds of which of the following transition elements do not exhibit an oxidation state of +3?

d - block and f - block Elements

Mercurous ion is represented as:

d - block and f - block Elements

The element that acts as a good catalyst for several reactions has a atomic number:

d - block and f - block Elements

The element that usually does not show variable oxidation states is :

d - block and f - block Elements

Which of the following statements about $$Na_2O_2$$ is not correct?

d - block and f - block Elements

Which one of the following exhibits the largest number of oxidation states?

d - block and f - block Elements

In context with the transition elements, which of the following statements is incorrect?

d - block and f - block Elements

Which one of the following species is stable in aqueous solution

d - block and f - block Elements

Iron exhibits +2 and +3 oxidation states. Which of the following statements about iron is incorrect?

d - block and f - block Elements

The oxidation number of Mn in the product of alkaline oxidative fusion of $$MnO_{2}$$ is:

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