Complete IIT AIEEE ICSE ISC PMT help forum
This is a free help Forum for Indian Students.
Complete IIT AIEEE ICSE ISC PMT help forum
This is a free help Forum for Indian Students.
Complete IIT AIEEE ICSE ISC PMT help forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.
Complete IIT AIEEE ICSE ISC PMT help forum

Complete help forum for students preparing for icse iit aieee cbse pmt and other related exams.Stay updated about all 2011 exams.
 
HomeHome  PortalPortal  SearchSearch  Latest imagesLatest images  RegisterRegister  Log in  India NewsIndia News  
Keywords
graph science UNION SELECT papers paper CLASS 2007 2006 computer CASE question ICSE 2004 2009 prelim physics 2010 YEAR RESULT
Latest topics
» Nitration of aniline - IIT JEE 2018 Advanced - solved
chem now........ EmptyFri Jun 08, 2018 2:34 am by adianadiadi

» Diamagnetic - Paramagnetic - Ni(CO)4, [Ni(CN)4]2- and [NiCl4
chem now........ EmptyFri Apr 06, 2018 1:05 am by adianadiadi

» IIT JEE chemistry solved interactive question paper
chem now........ EmptySun Oct 29, 2017 12:11 pm by adianadiadi

» IIT JEE 2015 SOLVED QUESTION PAPER
chem now........ EmptyWed Oct 19, 2016 1:44 pm by adianadiadi

» IIT JEE chemistry solved questions
chem now........ EmptySat Jul 18, 2015 6:15 pm by adianadiadi

» General Description of Chinese Market for Foaming Agent ADC
chem now........ EmptyFri May 09, 2014 2:09 pm by happybaicaitou

» How to get Lowest Cost MBBS Admission?
chem now........ EmptyMon Feb 24, 2014 6:39 pm by MENTOR 2014

»  girl boy vashikaran specialist agori baba ji +91-9461165
chem now........ EmptyTue Jan 21, 2014 6:00 pm by krshastri

»  STRONG LOST LOVE SPELL +91-9461165176
chem now........ EmptyTue Jan 21, 2014 6:00 pm by krshastri

Top posters
abhas
chem now........ Vote_lcapchem now........ Voting_barchem now........ Vote_rcap 
Anu..i luv icse...:)
chem now........ Vote_lcapchem now........ Voting_barchem now........ Vote_rcap 
G-7
chem now........ Vote_lcapchem now........ Voting_barchem now........ Vote_rcap 
siya
chem now........ Vote_lcapchem now........ Voting_barchem now........ Vote_rcap 
Candy
chem now........ Vote_lcapchem now........ Voting_barchem now........ Vote_rcap 
jOhNy
chem now........ Vote_lcapchem now........ Voting_barchem now........ Vote_rcap 
Apurva
chem now........ Vote_lcapchem now........ Voting_barchem now........ Vote_rcap 
WinRrule
chem now........ Vote_lcapchem now........ Voting_barchem now........ Vote_rcap 
ambili
chem now........ Vote_lcapchem now........ Voting_barchem now........ Vote_rcap 
saif
chem now........ Vote_lcapchem now........ Voting_barchem now........ Vote_rcap 



Search if you can't find it here

chem now........

View previous topic View next topic Go down
AuthorMessage
pavan
Active member
Active member



chem now........ Vide
PostSubject: chem now........ chem now........ EmptyFri Mar 13, 2009 10:57 pm

Can u guyz help me out.......plzzzzz
(!)Explain y dil.sulphuric acid is a strnger acid thn conc. sulphuric acid??????????? Mad Embarassed
(~)give one use of pottasium hydroxide...

shud we kno to calc the PH of solns???????(if conc . of it is givn) No No No
Back to top Go down
Anu..i luv icse...:)
Active member
Active member
Anu..i luv icse...:)


chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySat Mar 14, 2009 11:13 am

1) actually, the question should be wrong...coz, the strength of an acid does NOT depend upon its concentration...in my text, its given in a big box, that a strng acid will remain strng even if it is dilute .

or, since the question is asked, we have to answer! so, i think its because the mobility of the ions increases? Suspect i dunno!!

2) KOH is used in soap manufacture

3) no...PH is not in syll. just knw that, above 7 is alkali, below 7 is acid and 7 is neutral.

ALL the best!
Back to top Go down
pavan
Active member
Active member



chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySat Mar 14, 2009 12:03 pm

may b anu.......but im stil in doubt Mad
anyway....ALL THE BEST FRTHE EXAMS
thnx for anss


vat s formalin?????give its use
give a use of carbon tetrachloride
vat si denaturated alchohl?????/


Last edited by pavan on Sat Mar 14, 2009 12:11 pm; edited 1 time in total (Reason for editing : to add some quests)
Back to top Go down
Arya Nair
Active member
Active member
Arya Nair


chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySat Mar 14, 2009 7:49 pm

thanks for the answers
Back to top Go down
abhi_1993
Active member
Active member



chem now........ Vide
PostSubject: ans chem now........ EmptySun Mar 15, 2009 12:33 am

i know im a total stranger...but i thought i shud help..
well...dil sulphuric acid is strongr than conc.H2SO4 bcoz pH of an acid is determined by the concentration of H3O+(hydronium) ions in solution....so...dil. H2SO4 will furnish more H30+ ions dan conc.H2SO4(bcoz of water)..and hence it will have a lower pH.....dats wy its stronger
we dont have formalin according 2 d scope of our syllabus(we dont hav aldehydes)...but anyway..its 40% HCHO in CH3OH...used as antiseptic, disinfectant,etc..
n use of carbon tetrachloride is dat its a solvent(for organic compounds ofcourse)


Last edited by abhi_1993 on Sun Mar 15, 2009 1:23 am; edited 1 time in total
Back to top Go down
abhi_1993
Active member
Active member



chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySun Mar 15, 2009 12:44 am

i 4gt to mention..im not very sure ....but..denatured alcohol is ethyl alcohol made unfit 4 drinkin by adding methanol,CuSO4(gives it a blue colour) and pyridine(which stinks)...dey do that as it is used in industries n dey dont want ppl to drink it...so dey make it look strange(blue) n make it stink(by use of pyridine)!!
Back to top Go down
Teju
Active member
Active member
Teju


chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySun Mar 15, 2009 1:33 am

tnxx anu n abhi 4 ur answers
Back to top Go down
deboshree
Active member
Active member



chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySun Mar 15, 2009 8:28 am

oh abhi , denatured alcohol is absolutely correct. it is exactly -word by word same to what our sir has told
Back to top Go down
pavan
Active member
Active member



chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySun Mar 15, 2009 11:11 am

thx abhi...
Back to top Go down
Anirudh The Conquerer
Active member
Active member
Anirudh The Conquerer


chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySun Mar 15, 2009 12:15 pm

concentration of the acid depends on the no. of H+ ions.
concentrated acid contains less no. of water molecules which is a polar solvent so rate of dissociation of H+ ions is less but in a dilute acid more no. of water molecules so rate of dissociation of H+ is more thus it is more acidic than the concentrated H2SO4

what is gas carbon?Question
what is "Le Chatelier's principal"? Question
Back to top Go down
Anu..i luv icse...:)
Active member
Active member
Anu..i luv icse...:)


chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySun Mar 15, 2009 2:15 pm

hey anirudh , no. of H+ is the degree of ionization na....concentration is just the amount of water present in a given sample of a solution

still not convinced.....maybe we should write these answers only if they ask in the board...i hope they dont give it!
Back to top Go down
abhi_1993
Active member
Active member



chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySun Mar 15, 2009 6:36 pm

uh...about H+ ions...actually i believe they cannot exist themselves as they react with water to give H3O+ions(ie. hydronium ions)...more the concentration of hydronium ions more acidic it is....
gas carbon is another form of carbon...dont need to know much about it...beyond our scope...just need to know that it is used
Le chatelier's principle...the details are beyond our scope...but it says that wen the reaction is exothermic, reaction is favoured by decreasing temperature and when the resulting volume is less than the reactants( eg. N2+3H2-->2NH3 dat means 4(3+1) vols of reactants give 2 vols of ammonia)..it is favoured by increase in pressure...the reason is a little complicated...its somthing about it opposing the system and counteracting the change...
but you cannot decrease the temp so much that it slows the reaction...so optimum temp is used...n high pressure may damage stuff...so optimum pressure is used accordingly....
Back to top Go down
Midhun Sarath
Active member
Active member
Midhun Sarath


chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySun Mar 15, 2009 9:13 pm

tnx abhi Very Happy
Back to top Go down
Midhun Sarath
Active member
Active member
Midhun Sarath


chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySun Mar 15, 2009 9:14 pm

ani.. ur 2nd doubt is out of syll ?
Back to top Go down
abhi_1993
Active member
Active member



chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySun Mar 15, 2009 9:18 pm

no...the le chatelier's principle is in syllabus...but the details are not
Back to top Go down
Hari
Active member
Active member
Hari


chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySun Mar 15, 2009 10:14 pm

le chatelier's priciple:::::: if a reaction is exothermic it is favoured by lowering the temrature(better yield)
Back to top Go down
nikhita
Active member
Active member
nikhita


chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySun Mar 15, 2009 10:23 pm

hey guys thanx 4 ur asnwers Smile
Back to top Go down
Midhun Sarath
Active member
Active member
Midhun Sarath


chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptySun Mar 15, 2009 10:34 pm

tnx hari Very Happy
Back to top Go down
Anirudh The Conquerer
Active member
Active member
Anirudh The Conquerer


chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptyMon Mar 16, 2009 10:11 am

thnx guys Very Happy Very Happy Very Happy Very Happy Very Happy Very Happy
Back to top Go down
Anirudh The Conquerer
Active member
Active member
Anirudh The Conquerer


chem now........ Vide
PostSubject: Re: chem now........ chem now........ EmptyMon Mar 16, 2009 10:13 am

thnx guys Very Happy Very Happy Very Happy Very Happy Very Happy Very Happy
all the best for ur exams
Back to top Go down
Sponsored content




chem now........ Vide
PostSubject: Re: chem now........ chem now........ Empty

Back to top Go down

chem now........

View previous topic View next topic Back to top
Page 1 of 1

Permissions in this forum:You cannot reply to topics in this forum
Complete IIT AIEEE ICSE ISC PMT help forum :: Physics :: Physics Question answer-