Home » Ask & Discuss » Chemistry. » Inorganic Chemistry « Back to Discussion

Inorganic Chemistry

Hot goIITian

Joined:	14 Dec 2009
Post:	150

3 Feb 2010 17:04:31 IST

0 People liked this

454

a green chromium compound A on fusion with alkali in presence of air forms a yellow compound B which

None

a green chromium compound A on fusion with alkali in presence of air forms a yellow compound B which on acidification gives an orange colored compound C . C on treatment with NH4Cl gives orange colored compound D which on heating gives back A . identify A , B ,C , D and write balanced reactions involved .

Share this article on:

Comments (5)

siri acha

New kid on the Block

Joined: 2 Feb 2010

Posts: 27

3 Feb 2010 17:11:04 IST

Like 0 people liked this

ask the mentor of rgukt

winx

Scorching goIITian

Joined: 28 Jan 2010

Posts: 299

9 Feb 2010 16:26:05 IST

Like 0 people liked this

...................nid ans 4 dis question..............

ny1 here 2 help me plzzzzzz

SRIJAN MISHRA

Cool goIITian

Joined: 2 Feb 2010

Posts: 78

9 Feb 2010 17:33:08 IST

Like 1 people liked this

A -Cr₂O₃

B - CrO₄^-2

C - Cr₂O₇^-2

D - NH₄Cr₂O₇

Akshay

Hot goIITian

Joined: 25 Jun 2008

Posts: 174

9 Feb 2010 18:39:35 IST

Like 2 people liked this

Answer given by Srijan r correct.

The reaction is

Cr₂O₃ (fusion with alkali) ---> CrO₄^2- (on acidification) --->Cr₂O₇^2- +NH₄Cl ---> (NH₄)₂Cr₂O₇ (on heating)--> Cr₂O₃

The chemical reactions r

2Cr₂O₃ + 8OH^- + 3O₂ --> 4CrO₄^2- + 4H₂O

2CrO₄^2- + H₂SO₄ --> Cr₂O₇^2- + SO₄^2- + H₂O

Cr₂O₇^2- + 2NH₄Cl --> (NH₄)₂Cr₂O₇ +2Cl^-

(NH₄)₂Cr₂O₇ (on heating) --> Cr₂O₃ + N₂ +4H₂O

winx

Scorching goIITian

Joined: 28 Jan 2010

Posts: 299

9 Feb 2010 19:18:34 IST

Like 0 people liked this

THANX A LOT

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