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Biology; Chemistry; Physics: Post your doubts here!

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o_O which electrons shud i remove. sorry i am beat ryt now... all i can think of is this formula and that reaction. its all mixed up!! :cry:
just like the question states there is a loss of electrons..:D
just balance the equation (charges first) and then youll get it
let me try!! :D
 
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State a use of slaked lime. what's the formulae ? Ca(OH)2 ?

Used to nuetralize acidic salts? what others could be?
is it used in iron extraction?? just a guess. also check if it is used in flue gas desulphrisation. but check b4 u rely on my words bcuz i ha yet to revise those topics -___-
 
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are you crazy??
the anode and cathode will not be staying at the same position and there will be some really funny and confused movement of the ions!!
they ll go like
" lets go to that side, no that side, no that side and so on"

LOL .. literally ROFL .. hahahaha never thought of it that ways!! btw aik aadh MCQ dekha hai jidr unhoonay wrong answer mein AC current pass kara hai .. so wohi soch raha tha kay uss mein kia hota hoga .. !!


Its literally a experiment worth testing i guess :p
 
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Bromine and Sulphur are incorrect, that's what the examiner report said. no MS available. I think it should be carbon too, was thinking of iodine before, cuz of its proton number :p
carbon giant molecilar structure is graphite and diamond...they both r madeof carbon
 
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LOL .. literally ROFL .. hahahaha never thought of it that ways!! btw aik aadh MCQ dekha hai jidr unhoonay wrong answer mein AC current pass kara hai .. so wohi soch raha tha kay uss mein kia hota hoga .. !!


Its literally a experiment worth testing i guess :p
and yeah i figured out
CARBON is the correct answer..:)
 
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helpp!! QA4 (b)(ii) from O/N 2011 paper 21 of chemistry.
the question is:
During a stage in photosynthesis, electrons are removed from water to produe hydrogen ions and oxygen gas.
Write an equation for this reaction.
i wrote:
2H2O --> 4H+(aq) + O2(g)
but in the marking scheme it is given:
2H2O --> 2H+ + O2 + 2e-

Explain please!! :cry: :mad: :cautious: o_O :sleep:
i just solved and ms is wrong
it has to be 4e- at the end!! :D
 
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Think time people!
Explain why all cell reactions are exhothermic and redox?(2)

If a solution contains dilute sulphuric acid and It has one ELECTRODE as Iron and Other ELECTRODE as Zinc! and Hydrogen gas evolves at Iron Electrode what would be the Anode? Give a reason for your choice(2)
 
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