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

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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
Question

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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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1-nothin happens coz iron ishigher dan Cu in d series
2-d color of litmus changes 2 red

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thanx............ Smile

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ur welcome ambili....

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vill not Fe replace Cu from CuSO4

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plssss.....make it clear,i didn't understand it!!!! Question

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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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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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I GUESS THAT IRON ALWAYS TENDS TO FORM IRON[3] N NOT IRON[2]

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arre haan sorry ambili.i said dat by mistake.ya NAMIT'S ANSWER IS RITE.SORRRRRRRRRYYYYYYY Very Happy

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WRONG ANSWERS

I'll explain each one....

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1. i guess....

CuSO4 + Fe = FeSO4 + Cu

thus, Cu gives a bluish green colour to the sol.

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

Ambili...am i clear?

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thaaaaaaaanx.................. cheers

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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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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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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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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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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!!!