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

Inorganic Chemistry

Blazing goIITian

Joined:	25 Oct 2008
Post:	302

27 Feb 2009 12:53:46 IST

0 People liked this

1043

Give reasons a) HF is least volatile where as HCl is most volatile among hydrogen halides. b)Boron

None

Give reasonsa) HF is least volatile where as HCl is most volatile among hydrogen halides.b)Boron forms electron deficient compds.c)silanes get hydrolysed by waterd)H3PO3 is a diprotic acid.e) Pentavalent bismuth is a strong oxidising agent

Share this article on:

Comments (5)

sneha

Blazing goIITian

Joined: 17 Mar 2008

Posts: 1243

27 Feb 2009 13:07:28 IST

Like 1 people liked this

1.volatile nature depends upon Molecular mass and type of attraction.heavy compounds are less volatile. this implies HF should be most volatile and HI should be least. but H-bonding in HF makes it least volatile. hence the order is HCl> HBr>HI >HF

Feuer Zaber

Blazing goIITian

Joined: 12 Jul 2008

Posts: 310

27 Feb 2009 13:10:13 IST

Like 1 people liked this

HF is least volatile since its molecules are associated through H bonds
Boron has max co-ordination 3 due to absence of d orbital.But 3 atoms around it does not satisfy its octect.So it is a electrom deficient compound.
-
consider its structure.there's one =o,2 O-H bonds and one P-H bon.the two O-H bonds cleave in aq medium giving two H.So it is a diprotic acid.
Inert pair effect.+5 state is unstable and it reduces to +3 state.So,good oxidizing agent.

sneha

Blazing goIITian

Joined: 17 Mar 2008

Posts: 1243

27 Feb 2009 13:10:29 IST

Like 1 people liked this

2. Boron has 2s2 2p1 hence it can form maximum 3 bonds which implies it can have not more than 6 electrons in its outer most shell hence it cannot have complete octet.

Abhishek Kumar Singh

Cool goIITian

Joined: 3 Feb 2009

Posts: 50

27 Feb 2009 13:17:15 IST

Like 1 people liked this

(D)

since its gives out two OH^- ions attached to Phosphorus.

[DO RATE]

JPS

Blazing goIITian

Joined: 21 Nov 2008

Posts: 1020

27 Feb 2009 17:05:38 IST

Like 1 people liked this

c. In silanes Si has empty d-orbitals which can accomodate the lone pair electrons of water , so they get hydrolysed. In the same way branes are hydrolysed too due to the electron deficient nature of B and so it accepts electrons from water.

e.Bi has +5 charge and hence has strong affinity for electrons in pentavalent compounds. This is the reason why it acts as OA.

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