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plsssssssss............answer this

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ambili
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PostSubject: plsssssssss............answer this Wed Feb 11, 2009 9:19 pm

what is observed when
1.a small piece of iron is placed in copper sulphste solution
2.neutral litmus solution is added to sodium hydrogen carbonate solution

3.If QS is a ionic compound,can Q and S both be metals
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kanika rajput
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PostSubject: Re: plsssssssss............answer this Wed Feb 11, 2009 9:31 pm

ans3)no ...........one shud be a non metal as a ionic bond is formed between a metal nd a non metal
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siya
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PostSubject: Re: plsssssssss............answer this Wed Feb 11, 2009 10:21 pm

1-nothin happens coz iron ishigher dan Cu in d series
2-d color of litmus changes 2 red
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PostSubject: Re: plsssssssss............answer this Thu Feb 12, 2009 7:10 pm

thanx............ Smile
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siya
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PostSubject: Re: plsssssssss............answer this Thu Feb 12, 2009 7:35 pm

ur welcome ambili....
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kanika rajput
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PostSubject: Re: plsssssssss............answer this Thu Feb 12, 2009 8:42 pm

vill not Fe replace Cu from CuSO4
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ambili
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PostSubject: Re: plsssssssss............answer this Thu Feb 12, 2009 9:35 pm

plssss.....make it clear,i didn't understand it!!!! Question
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Apurva
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PostSubject: Re: plsssssssss............answer this Fri Feb 13, 2009 4:53 pm

iron will displace cu from cuso4 because fe is higher in the activity series
so the colour of the solution will change from blue to brown
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PostSubject: Re: plsssssssss............answer this Fri Feb 13, 2009 6:45 pm

hey i think da colour wil change but frm blue to green.. bcz FeSO4 is green bcz of the presence of Fe2+ ions which r green in colour..
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PostSubject: Re: plsssssssss............answer this Fri Feb 13, 2009 6:57 pm

I GUESS THAT IRON ALWAYS TENDS TO FORM IRON[3] N NOT IRON[2]
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siya
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PostSubject: Re: plsssssssss............answer this Fri Feb 13, 2009 7:36 pm

arre haan sorry ambili.i said dat by mistake.ya NAMIT'S ANSWER IS RITE.SORRRRRRRRRYYYYYYY Very Happy
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PostSubject: Re: plsssssssss............answer this Fri Feb 13, 2009 7:38 pm

WRONG ANSWERS

I'll explain each one....
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PostSubject: Re: plsssssssss............answer this Fri Feb 13, 2009 7:39 pm

1. i guess....

CuSO4 + Fe = FeSO4 + Cu

thus, Cu gives a bluish green colour to the sol.
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PostSubject: Re: plsssssssss............answer this Fri Feb 13, 2009 7:41 pm

2. The Litmus turns blue

Reason:

NaHCO3 hydrolyses to give NaOH and H2CO3...

H2CO3 is weak acid....doesnt ionize

but, NaOH is strong....thus, it dissociates, giving OH- ions

OH- ions is alkaline character, thus, the litmus turns blue....
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PostSubject: Re: plsssssssss............answer this Fri Feb 13, 2009 7:42 pm

third ans is correct...obviously..its easy one Very Happy

Ambili...am i clear?
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ambili
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PostSubject: Re: plsssssssss............answer this Fri Feb 13, 2009 8:15 pm

thaaaaaaaanx.................. cheers
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PostSubject: Re: plsssssssss............answer this Fri Feb 13, 2009 8:22 pm

hey ambili wait!!!!!i think anu is confused in 1st answer bcoz Cu ions have blue color not Cu metal n in such cases d color of d soln. depends on d color of ions in t soln. n here its Fe ions having a green color so d color of d soln. wud b green
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PostSubject: Re: plsssssssss............answer this Fri Feb 13, 2009 8:36 pm

iron tends to form fe3+ions n not fe2+ions
n since fe3+ ions impart brown color so d color of the solution will become brown from blue
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Namit
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PostSubject: Re: plsssssssss............answer this Fri Feb 13, 2009 8:37 pm

yeah rite.. da color of solution wont depend upon da colour of copper.. it will depend on Fe2+ which r green.. da answer is correct.. siya ne bhi toh apni consent de di naa.. lol.. Very Happy
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PostSubject: Re: plsssssssss............answer this Fri Feb 13, 2009 8:39 pm

nd yeah.. iron has variable valency.. in Fe(0H)3 it has a valency of 3 bt in FeSO4 its +2.. bcz it balances da -2 valency of sulphate ion..
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PostSubject: Re: plsssssssss............answer this Fri Feb 13, 2009 9:50 pm

yeah ....i said blue green....its wrong...its green...coz of Fe2+ LOL!!! ambili...now, everone is right!!

now, whats the confusion about Fe3 n 2??? with SO4 it is 2 only.....

its single displacement....Apurva....dont get confused!!!
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