Home » Ask & Discuss » Chemistry
« Back to Discussion

Inorganic Chemistry

Cool goIITian

Joined:	29 Sep 2009
Post:	30

23 Nov 2009 19:03:41 IST

0 People liked this

2323

Which is a stronger reducing agent Cr2+ or Fe2+ and why?

Engineering Entrance , Medical Entrance , NEET , JEE Main , AIIMS , JEE Main & Advanced , Chemistry , Inorganic Chemistry

Which is a stronger reducing agent Cr2+ or Fe2+ and why?

Comments (5)

Suresh Kumar

Forum Expert

Joined: 24 Aug 2009

Posts: 1342

23 Nov 2009 19:08:14 IST

Like 1 people liked this

hello dear

The following reactions are involved when Cr²⁺ and Fe²⁺ act as reducing agents.

Cr²⁺ Cr³⁺Fe²⁺ Fe³⁺

The value is −0.41 V and is +0.77 V. This means that Cr²⁺ can be easily oxidized to Cr³⁺, but Fe²⁺ does not get oxidized to Fe³⁺ easily. Therefore, Cr²⁺ is a better reducing agent that Fe³⁺.

Akshay

Hot goIITian

Joined: 25 Jun 2008

Posts: 174

23 Nov 2009 19:12:50 IST

Like 0 people liked this

Cr²⁺is a stronger reducing agent because it can lose one of its electron to become Cr³⁺ in which the t₂g level of d-orbital is half filled and eg level is empty.

Susin

Cool goIITian

Joined: 10 Nov 2009

Posts: 51

24 Nov 2009 22:47:08 IST

Like 0 people liked this

The following reactions are involved when Cr²⁺ and Fe²⁺ act as reducing agents.

Cr²⁺ Cr³⁺Fe²⁺ Fe³⁺

The value is −0.41 V and is +0.77 V. This means that Cr²⁺ can be easily oxidized to Cr³⁺, but Fe²⁺ does not get oxidized to Fe³⁺ easily. Therefore, Cr²⁺ is a better reducing agent that Fe³⁺.

Antony George

New kid on the Block

Joined: 11 Mar 2012

Posts: 1

11 Mar 2012 15:06:26 IST

Like 0 people liked this

The crystal field stabilization energy of Cr3+ in aq. solution is maximum due to its d3 electronic configuration while the same is nil for Fe3+ due to d5 electronic state. So, Cr2+ is a stronger reducing agent.

Gargee Mehta

Blazing goIITian

Joined: 8 Sep 2011

Posts: 437

11 Mar 2012 19:12:16 IST

Like 0 people liked this

After oxidation Cr3+ has a d3 configuration and Fe+3 has a d5 configuration. So d3 is more stable due to half filled t2g level. and also d3 IS MORE STABLE THAN d5 IN A MEDIUM(LIKE WATER)....

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team